6884353 ASCII Character Codes

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1

Technical Reference

SOME OF THE MAIN TOPICS IN THIS CHAPTER AREGeneral Information Award BIOS Error Codes AMI BIOS Error Codes Phoenix BIOS Error Codes Microid Research (MR) BIOS Error Codes IBM BIOS Beep and Alphanumeric Error Codes ROM BIOS Hard Drive Parameters Modem Control Codes DOS Command Reference

Technical Reference

General InformationASCII Character Code ChartsFigure 1 lists ASCII control character values. Figure 2 shows the IBM extended ASCII line-drawing characters in an easy-to-use format. I frequently use these extended ASCII line-drawing characters for visual enhancement in documents I create.DEC 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 HEX 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1FA CHAR NAME Ctrl-@ Ctrl-A Ctrl-B Ctrl-C Ctrl-D Ctrl-E Ctrl-F Ctrl-G Ctrl-H Ctrl-I Ctrl-J Ctrl-K Ctrl-L Ctrl-M Ctrl-N Ctrl-O Ctrl-P Ctrl-Q Ctrl-R Ctrl-S Ctrl-T Ctrl-U Ctrl-V Ctrl-W Ctrl-X Ctrl-Y Ctrl-Z Ctrl-[ Ctrl-\ Ctrl-] Ctrl-^ Ctrl-_ NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO SI DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US CONTROL CODE Null Start of Heading Start of Text End of Text End of Transit Enquiry Acknowledge Bell Back Space Horizontal Tab Line Feed Vertical Tab Form Feed Carriage Return Shift Out Shift In Data Line Escape Device Control 1 Device Control 2 Device Control 3 Device Control 4 Negative Acknowledge Synchronous Idle End of Transmit Block Cancel End of Medium Substitute Escape File Separator Group Separator Record Separator Unit Separator

o

o

!!

Figure 1

ASCII control codes.

General Information

218 DA

191 C2 196 C4 197 C5 193 C1

191 BF

201 C9 204 CC 200 C8

203 CB 205 CD 186 BA 206 CE 202 CA

187 BB 185 B9 188 BC

176 177 178 219 220

B0 B1 B2 DB DC DD DE DF FE

195 C3 192 C0

179 B3

180 B4 217 D9

213 D5 198 C6 212 D4

209 D1 205 CD 216 D8 207 CF

184 B8 181 B5 190 BE

214 D6 199 C7 211 D3

210 D2 196 C4 215 D7 208 D0

183 B7 182 B6 189 BD

221 222 223 254

179 B3

186 BA

Figure 2

Extended ASCII line-drawing characters.

Hexadecimal/ASCII ConversionsTable 1Dec 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Hexadecimal/ASCII ConversionsHex 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 Octal 000 001 002 003 004 005 006 007 010 011 012 013 014 015 016 017 020 021 022 Binary 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0001 0001 0001 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 Name blank happy face inverse happy face heart diamond club spade bullet inverse bullet circle inverse circle male sign female sign single note double note sun right triangle left triangle up/down arrow Character

AB

H o K L M N O

P Q (continues)

Technical Reference Table 1Dec 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

ContinuedHex 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D Octal 023 024 025 026 027 030 031 032 033 034 035 036 037 040 041 042 043 044 045 046 047 050 051 052 053 054 055 056 057 060 061 062 063 064 065 066 067 070 071 072 073 074 075 Binary 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 Name double exclamation paragraph sign section sign rectangular bullet up/down to line up arrow down arrow right arrow left arrow lower left box left/right arrow up triangle down triangle space exclamation point quotation mark number sign dollar sign percent sign ampersand apostrophe opening parenthesis closing parenthesis asterisk plus sign comma hyphen or minus sign period slash zero one two three four five six seven eight nine colon semicolon less-than sign equal sign Character !! s

d eSpace ! # $ % & ( ) * + , . / 0 1 2 3 4 5 6 7 8 9 : ; < =

General InformationDec 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 Hex 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 Octal 076 077 100 101 102 103 104 105 106 107 110 111 112 113 114 115 116 117 120 121 122 123 124 125 126 127 130 131 132 133 134 135 136 137 140 141 142 143 144 145 146 147 150 Binary 0011 0011 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0110 0110 0110 0110 0110 0110 0110 0110 0110 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 Name greater-than sign question mark at sign capital A capital B capital C capital D capital E capital F capital G capital H capital I capital J capital K capital L capital M capital N capital O capital P capital Q capital R capital S capital T capital U capital V capital W capital X capital Y capital Z opening bracket backward slash closing bracket caret underscore grave lowercase A lowercase B lowercase C lowercase D lowercase E lowercase F lowercase G lowercase H Character > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h (continues)


ContinuedHex 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91 92 93 Octal 151 152 153 154 155 156 157 160 161 162 163 164 165 166 167 170 171 172 173 174 175 176 177 200 201 202 203 204 205 206 207 210 211 212 213 214 215 216 217 220 221 222 223 Binary 0110 0110 0110 0110 0110 0110 0110 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1001 1001 1001 1001 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 Name lowercase I lowercase J lowercase K lowercase L lowercase M lowercase N lowercase O lowercase P lowercase Q lowercase R lowercase S lowercase T lowercase U lowercase V lowercase W lowercase X lowercase Y lowercase Z opening brace vertical line closing brace tilde small house C cedilla u umlaut e acute a circumflex a umlaut a grave a ring c cedilla e circumflex e umlaut e grave I umlaut I circumflex I grave A umlaut A ring E acute ae ligature AE ligature o circumflex Character i j k l m n o p q r s t u v w x y z { | } ~ f

General InformationDec 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 Hex 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF Octal 224 225 226 227 230 231 232 233 234 235 236 237 240 241 242 243 244 245 246 247 250 251 252 253 254 255 256 257 260 261 262 263 264 265 266 267 270 271 272 273 274 275 276 277 Binary 1001 1001 1001 1001 1001 1001 1001 1001 1001 1001 1001 1001 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 Name o umlaut o grave u circumflex u grave y umlaut O umlaut U umlaut cent sign pound sign yen sign Pt function a acute I acute o acute u acute n tilde N tilde a macron o macron opening question mark upper-left box upper-right box 1/2 1/4 opening exclamation opening guillemets closing guillemets light block medium block dark block single vertical single right junction 2 to 1 right junction 1 to 2 right junction 1 to 2 upper-right 2 to 1 upper-right double right junction double vertical double upper-right double lower-right 1 to 2 lower-right 2 to 1 lower-right single upper-right Character _ a _ o 12 14 s s s (continues)


ContinuedHex C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA Octal 300 301 302 303 304 305 306 307 310 311 312 313 314 315 316 317 320 321 322 323 324 325 326 327 330 331 332 333 334 335 336 337 340 341 342 343 344 345 346 347 350 351 352 Binary 1100 1100 1100 1100 1100 1100 1100 1100 1100 1100 1100 1100 1100 1100 1100 1100 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1110 1110 1110 1110 1110 1110 1110 1110 1110 1110 1110 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 Name single lower-left single lower junction single upper junction single left junction single horizontal single intersection 2 to 1 left junction 1 to 2 left junction double lower-left double upper-left double lower junction double upper junction double left junction double horizontal double intersection 1 to 2 lower junction 2 to 1 lower junction 1 to 2 upper junction 2 to 1 upper junction 1 to 2 lower-left 2 to 1 lower-left 2 to 1 upper-left 1 to 2 upper-left 2 to 1 intersection 1 to 2 intersection single lower-right single upper-right inverse space lower inverse left inverse right inverse upper inverse alpha beta Gamma pi Sigma sigma mu tau Phi theta Omega Character

g g

=

General InformationDec 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 Hex EB EC ED EE EF F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF Octal 353 354 355 356 357 360 361 362 363 364 365 366 367 370 371 372 373 374 375 376 377 Binary 1110 1110 1110 1110 1110 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 Name delta infinity phi epsilon intersection of sets is identical to plus/minus sign greater/equal sign less/equal sign top half integral lower half integral division sign approximately degree filled-in degree small bullet square root superscript n superscript 2 box phantom space Character

Extended ASCII Keycodes for ANSI.SYSTable 2Code 0;1 0;3 0;14 0;15 0;16 0;17 0;18 0;19 0;20 0;21 0;22 0;23 0;24 0;25 0;26 0;27

Extended ASCII Keycodes for ANSI.SYSKeystroke Alt+Esc Null Character Alt+Backspace Shift+Tab Alt+Q Alt+W Alt+E Alt+R Alt+T Alt+Y Alt+U Alt+I Alt+O Alt+P Alt+[ Alt+] Code 0;28 0;30 0;31 0;32 0;33 0;34 0;35 0;36 0;37 0;38 0;39 0;40 0;41 0;43 0;44 0;45 Keystroke Alt+Enter Alt+A Alt+S Alt+D Alt+F Alt+G Alt+H Alt+J Alt+K Alt+L Alt+; Alt+ Alt+ Alt+\ Alt+Z Alt+X (continues)

Technical Reference Table 2Code 0;46 0;47 0;48 0;49 0;50 0;51 0;52 0;53 0;55 0;59 0;60 0;61 0;62 0;63 0;64 0;65 0;66 0;67 0;68 0;71 0;72 0;73 0;74 0;75 0;76 0;77 0;78 0;79 0;80 0;81 0;82 0;83 0;84 0;85 0;86 0;87 0;88 0;89 0;90 0;91 0;92 0;93 0;94

ContinuedKeystroke Alt+C Alt+V Alt+B Alt+N Alt+M Alt+, Alt+. Alt+/ Alt+Keypad * F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 Home Up Arrow Page Up Alt+Keypad Left Arrow Keypad 5 Right Arrow Alt+Keypad + End Down Arrow Page Down Insert Delete Shift+F1 Shift+F2 Shift+F3 Shift+F4 Shift+F5 Shift+F6 Shift+F7 Shift+F8 Shift+F9 Shift+F10 Ctrl+F1 Code 0;95 0;96 0;97 0;98 0;99 0;100 0;101 0;102 0;103 0;104 0;105 0;106 0;107 0;108 0;109 0;110 0;111 0;112 0;113 0;114 0;115 0;116 0;117 0;118 0;119 0;120 0;121 0;122 0;123 0;124 0;125 0;126 0;127 0;128 0;129 0;130 0;131 0;132 0;133 0;134 0;135 0;136 0;137 Keystroke Ctrl+F2 Ctrl+F3 Ctrl+F4 Ctrl+F5 Ctrl+F6 Ctrl+F7 Ctrl+F8 Ctrl+F9 Ctrl+F10 Alt+F1 Alt+F2 Alt+F3 Alt+F4 Alt+F5 Alt+F6 Alt+F7 Alt+F8 Alt+F9 Alt+F10 Ctrl+Print Screen Ctrl+Left Arrow Ctrl+Right Arrow Ctrl+End Ctrl+Page Down Ctrl+Home Alt+1 Alt+2 Alt+3 Alt+4 Alt+5 Alt+6 Alt+7 Alt+8 Alt+9 Alt+0 Alt+Alt+= Ctrl+Page Up F11 F12 Shift+F11 Shift+F12 Ctrl+F11

General InformationCode 0;138 0;139 0;140 0;141 0;142 0;143 0;144 0;145 0;146 0;147 0;148 0;149 0;150 Keystroke Ctrl+F12 Alt+F11 Alt+F12 Ctrl+Up Arrow Ctrl+Keypad Ctrl+Keypad 5 Ctrl+Keypad + Ctrl+Down Arrow Ctrl+Insert Ctrl+Delete Ctrl+Tab Ctrl+Keypad / Ctrl+Keypad * Code 0;151 0;152 0;153 0;155 0;157 0;159 0;160 0;161 0;162 0;163 0;164 0;165 0;166 Keystroke Alt+Home Alt+Up Arrow Alt+Page Up Alt+Left Arrow Alt+Right Arrow Alt+End Alt+Down Arrow Alt+Page Down Alt+Insert Alt+Delete Alt+Keypad / Alt+Tab Alt+Keypad Enter

EBCDIC Character CodesTable 3Dec 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

EBCDIC Character CodesHex 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 Octal 000 001 002 003 004 005 006 007 010 011 012 013 014 015 016 017 020 021 022 023 024 025 026 027 Binary 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0001 0001 0001 0001 0001 0001 0001 0001 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 Name NUL SOH STX ETX SEL HT RNL DEL GE SPS RPT VT FF CR SO SI DLE DC1 DC2 DC3 RES/ENP NL BS POC (continues) Character


ContinuedHex 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 Octal 030 031 032 033 034 035 036 037 040 041 042 043 044 045 046 047 050 051 052 053 054 055 056 057 060 061 062 063 064 065 066 067 070 071 072 073 074 075 076 077 100 101 102 Binary 0001 0001 0001 0001 0001 0001 0001 0001 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0011 0100 0100 0100 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 Name CAN EM UBS CU1 IFS IGS IRS IUS/ITB DS SOS FS WUS BYP/INP LF ETB ESC SA SFE SM/SW CSP MFA ENQ ACK BEL Character

SYN IR PP TRN NBS EOT SBS IT RFF CU3 DC4 NAK SUB SP RSP

General InformationDec 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 Hex 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E Octal 103 104 105 106 107 110 111 112 113 114 115 116 117 120 121 122 123 124 125 126 127 130 131 132 133 134 135 136 137 140 141 142 143 144 145 146 147 150 151 152 153 154 155 156 Binary 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0100 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0110 0110 0110 0110 0110 0110 0110 0110 0110 0110 0110 0110 0110 0110 0110 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 Name Character

. < ( + | &

! $ * ) ; /

| , % > (continues)


ContinuedHex 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 Octal 157 160 161 162 163 164 165 166 167 170 171 172 173 174 175 176 177 200 201 202 203 204 205 206 207 210 211 212 213 214 215 216 217 220 221 222 223 224 225 226 227 230 231 Binary 0110 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 0111 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1001 1001 1001 1001 1001 1001 1001 1001 1001 1001 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 Name Character ?

: # @ = a b c d e f g h i

j k l m n o p q r

General InformationDec 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 Hex 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 Octal 232 233 234 235 236 237 240 241 242 243 244 245 246 247 250 251 252 253 254 255 256 257 260 261 262 263 264 265 266 267 270 271 272 273 274 275 276 277 300 301 302 303 304 305 Binary 1001 1001 1001 1001 1001 1001 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1011 1100 1100 1100 1100 1100 1100 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 Name Character

~ s t u v w x y z

{ A B C D E (continues)

Technical Reference Table 3Dec 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239

ContinuedHex C6 C7 C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF Octal 306 307 310 311 312 313 314 315 316 317 320 321 322 323 324 325 326 327 330 331 332 333 334 335 336 337 340 341 342 343 344 345 346 347 350 351 352 353 354 355 356 357 Binary 1100 1100 1100 1100 1100 1100 1100 1100 1100 1100 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1101 1110 1110 1110 1110 1110 1110 1110 1110 1110 1110 1110 1110 1110 1110 1110 1110 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 Name Character F G H I SHY

} J K L M N O P Q R

\ NSP S T U V W X Y Z

General InformationDec 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 Hex F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF Octal 360 361 362 363 364 365 366 367 370 371 372 373 374 375 376 377 Binary 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 Name Character 0 1 2 3 4 5 6 7 8 9

EO

Metric System (SI) PrefixesTable 4Multiplier 1 000 000 000 000 000 000 000 000 1 000 000 000 000 000 000 000 1 000 1 000 1 000 1 000 1 000 1 000 100 10 0.1 0.01 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000

Metric System PrefixesExponent Form 10 102124

Prefix yotta zetta exa peta tera giga mega kilo hecto deca deci centi milli micro nano pico femto atto zepto yocto

SI Symbol Y Z E P T G M k h da d c m n p f a z y

001 000 000 000 000 000 000

001 000 000 000 000 000

001 000 000 000 000

001 000 001 000 000 001 000 000 000 001

1018 1015 1012 109 106 103 102 101 10-1 10-2 10-3 10-6 10-9 10-12 10-15 10-18 10-21 10-24

Technical Reference

U.S.Metric Units of Length ConversionsTable 51 1 1 1

Conversions from U.S. to Metric

inch = 2.54 centimeters = 25.4 millimeters foot = 30.48 centimeters = .3048 meter yard = .914 meter mile = 1.609 kilometers

Table 61 1 1 1

Conversions from Metric to U.S.

millimeter = .03937 inch centimeter = .3937 inch meter = 3.2808 feet = 1.0936 yards = 39.37 inches kilometer = .621 mile

Powers of 2Table 7n 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Powers of 22n 1 2 4 8 16 32 64 128 256 512 1,024 2,048 4,096 8,192 16,384 32,768 65,536 131,072 262,144 524,288 1,048,576 2,097,152 4,194,304 Hexadecimal 1 2 4 8 10 20 40 80 100 200 400 800 1000 2000 4000 8000 10000 20000 40000 80000 100000 200000 400000

General Informationn 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 2n 8,388,608 16,777,216 33,554,432 67,108,864 134,217,728 268,435,456 536,870,912 1,073,741,824 2,147,483,648 4,294,967,296 8,589,934,592 17,179,869,184 34,359,738,368 68,719,476,736 137,438,953,472 274,877,906,944 549,755,813,888 1,099,511,627,776 2,199,023,255,552 4,398,046,511,104 8,796,093,022,208 17,592,186,044,416 35,184,372,088,832 70,368,744,177,664 140,737,488,355,328 281,474,976,710,656 562,949,953,421,312 1,125,899,906,842,624 2,251,799,813,685,248 4,503,599,627,370,496 9,007,199,254,740,992 18,014,398,509,481,984 36,028,797,018,963,968 72,057,594,037,927,936 144,115,188,075,855,872 288,230,376,151,711,744 576,460,752,303,423,488 1,152,921,504,606,846,976 2,305,843,009,213,693,952 4,611,686,018,427,387,904 9,223,372,036,854,775,808 18,446,744,073,709,551,616 Hexadecimal 800000 1000000 2000000 4000000 8000000 10000000 20000000 40000000 80000000 100000000 200000000 400000000 800000000 1000000000 2000000000 4000000000 8000000000 10000000000 20000000000 40000000000 80000000000 100000000000 200000000000 400000000000 800000000000 1000000000000 2000000000000 4000000000000 8000000000000 10000000000000 20000000000000 40000000000000 80000000000000 100000000000000 200000000000000 400000000000000 800000000000000 1000000000000000 2000000000000000 4000000000000000 8000000000000000 10000000000000000

Technical Reference

Award BIOS Error CodesAward BIOS Text Error Messages and Beep CodesDuring the power on self test (POST), if the BIOS detects an error requiring you to do something, it will either sound a beep code or display a message. If a message is displayed, it will be accompanied by the following:PRESS F1 TO CONTINUE, CTRL-ALT-ESC OR DEL TO ENTER SETUP

Currently there is only one beep code in the Award BIOS. A single long beep followed by two short beeps indicates that a video error has occurred and the BIOS cannot initialize the video screen to display any additional information. One or more of the following messages may be displayed if the BIOS detects an error during the POST. Table 8 includes Award BIOS messages for both the ISA and the EISA BIOS.

Table 8

Award BIOS Error Messages (ISA and EISA BIOS)Description The checksum of the BIOS code in the BIOS chip is incorrect, indicating the BIOS code may have become corrupt. Replace the BIOS. CMOS battery is no longer functional. Replace battery. Checksum of CMOS is incorrect, so the system loads the default equipment configuration. A checksum error may indicate that CMOS has become corrupt. This error might have been caused by a weak battery. Check the battery and replace if necessary. Checksum of CMOS is incorrect. This can indicate that CMOS has become corrupt. This error may have been caused by a weak battery. Check the battery and replace if necessary. Displays the running speed of the CPU. Type of diskette drive installed in the system is different from the CMOS definition. Run Setup to reconfigure the drive type correctly. The display switch on the motherboard can be set to either monochrome or color. This message indicates the switch is set to a different setting than indicated in Setup. Determine which setting is correct, and then either turn off the system and change the jumper; or, enter Setup and change the VIDEO selection. Since last powering off the system, the display adapter has been changed. You must configure the system for the new display type. The EISA nonvolatile RAM checksum is incorrect or cannot correctly read the EISA slot. This can indicate either the EISA nonvolatile memory has become corrupt or the slot has been configured incorrectly. Also be sure the card is installed firmly in the slot. The slot configuration information stored in the EISA nonvolatile memory is incomplete. Hard drive cannot be initialized. Be sure the adapter is installed correctly and all cables are correctly and firmly attached. Also be sure the correct hard drive type is selected in Setup. Cannot initialize controller. Make sure the cord is correctly and firmly installed in the bus. Be sure the correct hard drive type is selected in Setup. Also check to see if any jumper needs to be set correctly on the hard drive.

Error Message BIOS ROM checksum error System halted CMOS battery failed CMOS checksum error Defaults loaded

CMOS CHECKSUM ERROR DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER CPU at nnnn DISKETTE DRIVES OR TYPES MISMATCH ERROR - RUN SETUP Display switch is set incorrectly.

DISPLAY TYPE HAS CHANGED SINCE LAST BOOT EISA Configuration Checksum Error

EISA Configuration Is Not Complete ERROR ENCOUNTERED INITIALIZING HARD DRIVE ERROR INITIALIZING HARD DISK CONTROLLER

Award BIOS Error CodesError Message FLOPPY DISK CNTRLR ERROR OR NO CNTRLR PRESENT Floppy disk(s) fail Description Cannot find or initialize the floppy drive controller. Make sure the controller is installed correctly and firmly. If there are no floppy drives installed, be sure the Diskette Drive selection in Setup is set to NONE. Cannot find or initialize the floppy drive controller or the drive. Make sure the controller is installed correctly. If no floppy drives are installed, be sure the Diskette Drive selection in Setup is set to NONE or AUTO. Please wait a moment Some hard drives require extra time to initialize. Cannot find or initialize the hard drive controller or the drive. Make sure the controller is installed correctly. If no hard drives are installed, be sure the Hard Drive selection in Setup is set to NONE. The system may run specific disk diagnostic routines. This message appears if one or more hard disks return an error when the diagnostics run. The nonvolatile memory containing EISA configuration information was programmed incorrectly or has become corrupt. Rerun EISA configuration utility to correctly program the memory. Cannot initialize the keyboard. Make sure the keyboard is attached correctly and no keys are being pressed during the boot. If you are purposely configuring the system without a keyboard, set the error halt condition in Setup to HALT ON ALL, BUT KEYBOARD. This will cause the BIOS to ignore the missing keyboard and continue the boot. This message usually indicates that one or more keys have been pressed during the keyboard tests. Be sure no objects are resting on the keyboard. Indicates a memory address error at a specific location. You can use this location along with the memory map for your system to find and replace the bad memory chips. Indicates a memory parity error at a specific location. You can use this location along with the memory map for your system to find and replace the bad memory chips. Memory has been added or removed since the last boot. In EISA mode, use configuration utility to reconfigure the memory configuration. In ISA mode, enter Setup and enter the new memory size in the memory fields. This message displays during a full memory test, counting down the memory areas being tested. If POST detects an error during memory testing, additional information appears giving specifics about the type and location of the memory error. Indicates an error verifying a value already written to memory. Use the location along with your systems memory map to locate the bad chip. This could mean that either a boot drive was not detected or the drive does not contain proper system boot files. Insert a system disk into drive A: and press Enter. If you assumed the system would boot from the hard drive, make sure the controller is inserted correctly and all cables are properly attached. Also be sure the disk is formatted as a boot device. Then reboot the system. This message is used in conjunction with the I/O CHANNEL CHECK and RAM PARITY ERROR messages when the segment that has caused the problem cannot be isolated. This message is used in conjunction with the I/O CHANNEL CHECK and RAM PARITY ERROR messages when the segment that has caused the problem has been isolated. (continues)

HARD DISK initializing HARD DISK INSTALL FAILURE

Hard disk(s) diagnosis fail

Invalid EISA Configuration

Keyboard error or no keyboard present

Keyboard is locked out Unlock the key Memory Address Error at

Memory parity Error at

MEMORY SIZE HAS CHANGED SINCE LAST BOOT Memory Test Memory test fail: Memory Verify Error at No boot device was found.

OFFENDING ADDRESS NOT FOUND OFFENDING SEGMENT:

Technical Reference Table 8 ContinuedDescription If the system cannot boot using the current CMOS configuration, the BIOS can override the current configuration with a set of BIOS defaults designed for the most stable, minimal-performance system operations. This will be displayed at the bottom of the screen when an error occurs that requires you to reboot. Press any key to reboot the system. You can press Esc to skip the full memory test. When BIOS detects a non-maskable interrupt condition during boot, this will allow you to disable the NMI and continue to boot; or you can reboot the system with the NMI enabled. System OEMs may replace the Award BIOS POST display with their own proprietary display. Including this message in the OEM display permits the operator to switch between the OEM display and the default POST display. POST detects an error in the primary master IDE hard drive. POST detects an error in the secondary master IDE hard drive. Indicates a parity error in RAM. Award offers a save-to-disk feature for notebook computers. This message may appear when the operator restarts the system after a save-to-disk shutdown. See the Press Tab message earlier for a description of this feature. POST detects an error in the primary slave IDE hard drive. POST detects an error in the secondary slave IDE hard drive. A valid board ID was found in a slot that was configured as having no board ID. The board installed is not responding to the ID request, or no board ID has been found in the indicated slot. Indicates that a slot designated as empty by the EISA configuration utility actually contains a board. Indicates the present boot attempt has been aborted and the system must be rebooted. Press and hold down the Ctrl and Alt keys and press Del. The board ID does not match the ID stored in the EISA nonvolatile memory.

Error Message Override enabled Defaults loaded PRESS A KEY TO REBOOT Press ESC to skip memory test PRESS F1 TO DISABLE NMI, F2 TO REBOOT Press TAB to show POST screen

Primary master hard disk fail Primary slave hard disk fail RAM PARITY ERROR CHECKING FOR SEGMENT Resuming from disk, Press TAB to show POST screen

Secondary master hard disk fail Secondary slave hard disk fail Should Be Empty But EISA Board Found Should Have EISA Board But Not Found Slot Not Empty SYSTEM HALTED, (CTRL-ALT-DEL) TO REBOOT Wrong Board In Slot

Award BIOS POST CodesAward BIOS POST Codes are shown in Table 9.

Table 9C0h 01h

Award BIOS POST CodesName Turn Off Chipset Cache Processor Test 1 Description OEM specific-cache control Processor Status (1FLAGS) Verification. Tests the following processor status flags: carry, zero, sign, overflow. The BIOS will set each of these flags, verify they are set, and then turn each flag off and verify it is off. Read/write/verify all CPU registers except SS, SP, and BP with data pattern FF and 00.

POST (Hex)

02h

Processor Test 2

Award BIOS Error CodesPOST (Hex) 03h Name Initialize Chips Description Disable NMI, PIE, AIE, UEI, SQWV. Disable video, parity checking, DMA. Reset math coprocessor. Clear all page registers, CMOS shutdown byte. Initialize timer 0, 1, and 2, including set EISA timer to a known state. Initialize DMA controllers 0 and 1. Initialize interrupt controllers 0 and 1. Initialize EISA extended registers. RAM must be periodically refreshed in order to keep the memory from decaying. This function ensures that the memory refresh function is working properly. Keyboard controller initialization.

04h

Test Memory Refresh Toggle

05h 06h 07h Beh C1h C5h C6h 08h

Blank video, Initialize keyboard Reserved Test CMOS Interface and Battery Status Chipset Default Initialization Memory presence test Early Shadow Cache presence test Setup low memory

Verifies CMOS is working correctly, detects bad battery. Program chipset registers with power on BIOS defaults. OEM-specific test to size onboard memory. OEM-specific early shadow; enable for fast boot. External cache size detection. Early chip set initialization, memory presence test, OEM chip set routines, clear low 64KB of memory, test first 64KB memory. Cyrix CPU initialization, cache initialization. Initialize first 120 interrupt vectors with SPURIOUS_INT_HDLR and initialize INT 00h-1Fh according to INT_TBL. Test CMOS RAM Checksum; if bad, or Insert key is pressed, load defaults. Detect type of keyboard controller (optional), set NUM_LOCK status. Detect CPU clock. Read CMOS location 14h to find out type of video in use. Detect and initialize video adapter. Test video memory, write sign-on message to screen. Setup shadow RAM. Enable shadow according to Setup. BIOS checksum test. Keyboard detect and initialization. Test DMA Controller. Test DMA Page Registers. None. Test 8254 Timer 0 Counter 2. Verify 8259 Channel 1 masked interrupts by alternately turning off and on the interrupt lines. Verify 8259 Channel 2 masked interrupts by alternately turning off and on the interrupt lines. Turn off interrupts then verify no interrupt mask register is on. Force an interrupt and verify the interrupt occurred. Verify NMI can be cleared. None. (continues)

09h 0Ah

Early Cache Initialization Setup Interrupt Vector Table

0Bh 0Ch 0Dh 0Eh 0Fh 10h 11h 12h 14h 15h 16h 17h 18h 19h 1Ah

Test CMOS RAM Checksum Initialize keyboard Initialize Video Interface Test Video Memory Test DMA Controller 0 Test DMA Controller 1 Test DMA Page Registers 13 Reserved Test Timer Counter 2 Test 8259-1 Mask Bits Test 8259-2 Mask Bits Test Stuck 8259s Interrupt Bits Test 8259 Interrupt Functionality Test Stuck NMI Bits (Parity/IO Check) Display CPU clock

Technical Reference Table 91B1Eh 1Fh

ContinuedName Reserved Set EISA Mode Description None. If EISA nonvolatile memory checksum is good, execute EISA initialization. If not, execute ISA tests and clear EISA mode flag. Test EISA Configuration Memory Integrity (checksum and communication interface). Initialize slot 0 (System Board). Initialize slots 1 through 15. Size base memory from 256KB640KB and extended memory above 1MB. Test base memory from 256KB640KB and extended memory above 1MB using various patterns. Note: This will be skipped in EISA mode and can be skipped with Esc key in ISA mode. If EISA mode flag is set then test EISA memory found in slots. Note: This will be skipped in ISA mode and can be skipped with Esc key in EISA mode. None. None. Detect if mouse is present, initialize mouse, install interrupt vectors. Initialize cache controller. Program chipset registers with Setup values. Display virus protect disable or enable. Initialize floppy disk drive controller and any drives. Initialize hard drive controller and any drives. Initialize any serial and parallel ports (also game port). None. Initialize math coprocessor. None. None. None. Reboot if manufacturing POST loop pin is set. Otherwise display any messages (that is, any non-fatal errors that were detected during POST) and enter Setup. Ask password security (optional). Write all CMOS values back to RAM and clear screen. Enable parity checker. Enable NMI. Enable cache before boot. Initialize any option ROMs present from C8000hEFFFFh. Note: When FSCAN option is enabled, will initialize from C8000hF7FFFh. Initialize time value in 40h: BIOS area. Setup virus protect according to Setup.

POST (Hex)

20h 21-2Fh 30h 31h

Enable Slot 0 Enable Slts 115 Size Base and Extended Memory Test Base and Extended Memory

32h

Test EISA Extended Memory initialization Reserved Setup Enabled Initialize and Install Mouse Setup Cache Controller Reserved Chipset Initialization Virus Protect Initialize Floppy Drive and Controller Initialize Hard Drive and Controller Detect and Initialize Serial/Parallel Ports Reserved Detect and Initialize Math Coprocessor Reserved Reserved Reserved Manufacturing POST Loop or Display Messages Security Check Write CMOS Pre-boot Enable Initialize Option ROMs

333Bh 3Ch 3Dh 3Eh 3Fh BFh 40h 41h 42h 43h 44h 45h 46h 47h 484Dh 4Eh

4Fh 50h 51h 52h

53h 60h

Initialize Time Value Setup Virus Protect

AMI BIOS Error CodesPOST (Hex) 61h 62h 63h B0h B1h E1Efh FFh Name Set Boot Speed Setup NumLock Boot Attempt Spurious Unclaimed NMI Setup Pages Boot Description Set system speed for boot. Setup NumLock status. Set low stack boot via INT 19h. If interrupt occurs in protected mode. If unmasked NMI occurs, display Press F1 to disable NMI, F2 reboot. E1- Page 1, E2 - Page 2, etc. None.

AMI BIOS Error CodesAMI BIOS Text Error MessagesTable 10Message Bad PnP Serial ID Checksum Floppy Disk Controller Resource Conflict NVRAM Checksum Error, NVRAM Cleared NVRAM Cleared By Jumper NVRAM Data Invalid, NVRAM Cleared Parallel Port Resource Conflict PCI Error Log is Full PCI I/O Port Conflict PCI IRQ Conflict PCI Memory Conflict Primary Boot Device Not Found Primary IDE Controller Resource Conflict Primary Input Device Not Found Secondary IDE Controller Resource Conflict Serial Port 1 Resource Conflict Serial Port 2 Resource Conflict Static Device Resource Conflict System Board Device Resource Conflict

AMI BIOS Text Error MessagesExplanation The Serial ID checksum of a Plug-and-Play card is invalid. The floppy disk controller has requested a resource that is already in use. The extended system configuration data (ESCD) was reinitialized because of an NVRAM checksum error. Clear CMOS and ESCD RAM and reboot. The Clear CMOS jumper has been moved to the Clear position. CMOS RAM and ESCD have been cleared. Invalid data found in the ESCD, which might mean that you have changed devices in the system. When this message is displayed, the BIOS has already rewritten the ESCD with current configuration data. The parallel port requested a resource that is already in use. More than 15 PCI conflict errors have been detected and no additional PCI errors can be logged. Two devices requested the same I/O address, resulting in a conflict. Two devices requested the same IRQ, resulting in a conflict. Two devices requested the same memory resource, resulting in a conflict. The designated primary boot device (hard disk drive, floppy disk drive, CD-ROM drive) could not be found. The primary IDE controller has requested a resource that is already in use. The designated primary input device (keyboard, mouse, or other device if input is redirected) could not be found. The secondary IDE controller has requested a resource that is already in use. Serial Port 1 has requested a resource that is already in use. Serial Port 2 has requested a resource that is already in use. A card that is not Plug-and-Play ISA has requested a resource that is already in use. A card that is not Plug-and-Play ISA has requested a resource that is already in use. (continues)

Technical Reference Table 10Message A20 Error Address Line Short! CMOS Battery State Low CMOS Checksum Invalid Run Setup CMOS Display Type Mismatch CMOS Memory Size Mismatch CMOS Time and Date Not Set Diskette Boot Failure DMA Error DMA #1 Error DMA #2 Error FDD Controller Failure HDD Controller Failure Insert Bootable Media INTR #1 Error INTR #2 Error Invalid Boot Diskette KB/Interface Error Keyboard Error Keyboard Stuck Key Detected Off Board Parity Error

ContinuedExplanation Gate A20 on the keyboard controller is not working. Error in the address decoding circuitry on the motherboard. The battery power is low; replace battery. After CMOS RAM values are saved, a checksum value is generated for error checking. The previous value is different from the current value. CMOS system options not set The values stored in CMOS RAM are either corrupt or nonexistent. Run Setup. The video type in CMOS RAM does not match the type detected by the BIOS. Run Setup. The amount of memory on the motherboard is different from the amount indicated in CMOS RAM. Run Setup. Run Setup to set the date and time in CMOS RAM. The boot disk in floppy drive A: is corrupt. It cannot be used to boot the system. Use another boot disk and follow the screen instructions. Error in the DMA controller. Error in the first DMA controller. Error in the second DMA controller. The BIOS cannot communicate with the floppy disk drive controller. Check all appropriate cables and connections. The BIOS cannot communicate with the hard disk drive controller. Check all appropriate cables and connections. The BIOS cannot find a bootable medium. Insert a bootable floppy disk or CD-ROM. Interrupt controller 1 failed POST. Interrupt controller 2 failed POST. The BIOS can read the disk in floppy drive A:, but cannot boot the system from it. Use another boot disk. There is an error in the keyboard connector. There is a timing problem with the keyboard. A stuck keyboard key was detected. Parity error in memory installed in an expansion slot. The format is: OFF BOARD PARITY ERROR ADDR (HEX) = (XXXX), where XXXX is the hex address where the error occurred. Parity error in memory installed on the motherboard. The format is: ON BOARD PARITY ERROR ADDR (HEX) = (XXXX), where XXXX is the hex address where the error occurred. Parity error in system memory at an unknown address. An error caused the computer to halt. There is an error in counter/timer 2. An uncorrectable ECC memory error was detected. An undetermined NMI was detected. Memory failed. If the memory location can be determined, it is displayed as xxxxx. If not, the message is Memory Parity Error ????. An expansion card failed. If the address can be determined, it is displayed as xxxxx. If not, the message is I/O Card Parity Error ????. A device has driven the bus signal for more than 7.8 microseconds.

On Board Parity Error

Parity Error System Halted! Timer Channel 2 Error Uncorrectable ECC Error Undetermined NMI Memory Parity Error at xxxxx I/O Card Parity Error at xxxxx DMA Bus Time-out

AMI BIOS Error Codes

AMI BIOS Beep CodesTable 11Beeps 1 2 3 4 5 6 7 8 9 10

AMI BIOS Beep CodesError Message DRAM Refresh Failure Parity Error Base 64KB (First Bank) Memory Failure System Timer Failure Processor Error Keyboard Controller Gate A20 Failure Virtual Mode Processor Exception Interrupt Error Display Memory Read/ Write Error ROM Checksum Error CMOS Shutdown Register Read/Write Error Cache Error/L2 Cache Bad Conventional/extended memory failure Display/retrace test failed Description The memory refresh circuitry on the motherboard is faulty. A parity error occurred in system memory. Memory failure in the first bank of memory. Memory failure in the first bank of memory, or timer 1 on the motherboard is not functioning. The processor on the motherboard generated an error. The keyboard controller might be bad. The BIOS cannot switch to protected mode. The processor generated an exception interrupt. The system video adapter is either missing or its memory is faulty. ROM checksum value does not match the value encoded in BIOS. The shutdown register for CMOS RAM failed.

11 1 3 1 8 long, short long, short

The L2 cache is faulty. The motherboard memory is faulty. The video card is faulty, try reseating or moving to a different slot.

AMI POST CodesTable 12Code 00h 00h 02h 08h 0Dh 0Dh 0Eh 0Fh 10h 10h

AMI BIOS POST CodesPOST Operation In Progress Give control to ROM in flash and execute boot. Execute boot. Disable internal cache. Keyboard controller test. Disable DMA controller #1, #2. Disable interrupt controller #1, #2. Reset video display. Check for signature of the board manufacturing company. If default jumper is set, go to Load CMOS Default. Check the validity of CMOS; if there is anything wrong or invalid, force to default. Load default CMOS settings. Clear error register, clear CMOS pending interrupt, check and set clock rate, check and set base memory size 512KB or 640KB. If base memory size is 640KB, allocate extended BIOS data area (EBDA). Otherwise, calculate the EBDA. (continues)

Technical Reference Table 12Code 10h

ContinuedPOST Operation In Progress Set up overlay environment. Update setup Flags with current operating environment. Initialize interrupt vector pointing to the error handlers. Update setup Flags in EBDA. Initialize CMOS pointers in EBDA. Program all chipset registers. Initialize system timer. Go to real memory base 64KB test. 16KB base RAM test. Hook made available prior to initializing the interrupt vector table. Setup interrupt vectors. Initialize and load interrupt vectors. Video rows initialization. Set monochrome mode. Set color displaycolor mode set. Clear parity status, if any. Custom video initialization required internally by some chipsets before video initialization. Test optional video ROM. Initialize registers internal to chipset after video initialization. Check for video ROM. Display memory read/write test. Test video horizontal and vertical tracing. Display video memory read/write test. Test video horizontal and vertical tracing. Beep if no video controller installed. Check for MDA. Setup video configuration (column x row). Display copyright message. Initialize messaging services. Clear the screen. Display the first screen sign-on. Update screen pointer. Display setup message. Display keyboard sign on. Display mouse sign-on. Memory test starting segment at 00000h. Calculate the memory size left to be tested. Disable caching. Check if the system memory size is larger than zero. Test and initialize to zero all DRAM. Remap memory partition if necessary. Test 1MB of memory. Update counter onscreen. Repeat memory test for each MB of memory until done. ChipsetAdjustMemorySize. Adjust any base of extended memory size because of chipset. Test DMA master page registers. Test DMA slave page registers. Program DMA controllers. Clear DMA write control registers. Unmask timer and NMI. Update master mask register. Run keyboard detection. Run mouse detection. Read interrupt mask; set up diskette ISR, #2, keyboard, and timer. 8042 interface test; enable keyboard interrupt if keyboard is detected. Enable interrupt. Check and set keyboard lock bit. Floppy unit initialization. Floppy controller and data setup.

13h 15h 1Bh 20h 23h 23h 24h 25h 28h 29h 2Ah 2Bh 2Ch 2Dh 2Eh 2Fh 30h 31h 32h 34h 36h 37h 39h 40h 43h 4Fh

52h 61h 62h 65h 66h 67h 80h 80h 81h 82h 83h 88h

AMI BIOS Error CodesCode 8Ch 8Fh 92h 96h 97h 98h 9Ah 9Dh A0h A0h A1h A2h A3h A6h A7h ABh ACh ADh ADh AEh AFh B0h B1h B3h B4h BBh POST Operation In Progress Set up interface between the BIOS POST and the device initialization management (DIM). Read interrupt mask. Unmask floppy interrupt. Setup floppy controller and data setup. Set up COM port and LPT port timeout values. Display wait message if setup key is pressed. Clear to bottom of the screen. Perform chipset initialization required before option ROM scans. Give control to ROM in flash. Verify and give control to optional ROM. Perform any chipset initialization required after option ROM scans; give control to ROM in flash. Adds MP entries for buses, I/O APIC, I/O INTRs, and LINTs. Timer data area initializationset time and date. Set up printer base addresses. Enable internal cache. Set COM base addresses. Keyboard stuck key check. Reset floating point unit. Log and display POST errors if any. Check to see if computer is in manufacturing mode. If there are POST errors, display setup key and boot key options. Call Setup program if setup was requested. Load and wait for the valid password; unmask INT-0A redirection. Custom floating point unit initialization. Initialize internal floating point unit. Update CMOS with floating point unit presence. A fatal error results in a continuous echo of DEAD to port 80hecho DE (wait 1 sec.), echo AD (wait 1 sec.). Set typematic rate. Read keyboard ID. Process POST errors. Test cache memory. Set up display mode (40 25, 80 25). Jump to PreOS (pre-operating system) module. Perform work before registers and circular keyboard buffer are cleared. Reinitialize message services. Initialize APM. Perform post-SMI initialization. Circumvents EMM386s attempts to utilize the lower 32KB area base. Fix CMOS read and CMOS write so that every call does not set NMI off. Shadow product information in the compatibility segment. Give a beep for boot. Handle chipset specific manipulation before boot. Check keyboard for data before MP manipulation. Initialize DS, ES, GS, and FS. Check if keyboard system- bit is set. Check whether a hard or soft reset has occurred. Power on initialization. Initialize special chipsets in power on/hard reset. Check cache size and type, write reserved cache size information to CMOS, determine processor speed (optional). Disable NMI reporting. Reset video adapter. If the microprocessor is in protected mode, load GDT 4GB segmentChipsetPreInit(). Disable L1 and L2 cache; perform any initialization required before the main chipset configuration is done. System validity check. Calculate checksum. Provides capability to do any special chipset initialization required before keyboard controller testing can begin. (continues)

BBh

D0h D1h D2h D3h D4h D5h D6h

Technical Reference Table 12Code D7h D8h D9h DAh DBh DDh DEh DFh E0h E1h E1h E1h E1h E1h E1h E1h E1h E2h E3h E4h E5h E6h E7h E8h E8h E9h EAh EBh EBh ECh EDh F0h F1h F2h F3h F4h F5h

ContinuedPOST Operation In Progress Flush the keyboard input buffer. Issue keyboard BAT command. Retrieve 8042 KBC output buffer. If keyboard initialization failed, display error message and halt. Provides capability to do any special chipset initialization after KBC test. Initialize keyboard controller command byte. A fatal error results in a continuous echo of DEAD to port 80h, echo DE (wait 1 sec.), and echo AD (wait 1 sec). Disable master/slave DMA controllers. Initialize master/slave programmable interrupt controllers. ChipsetInit. Preset any defaults needed to chipset registers. Start the refresh timer(s) running. Size all L2/L3 cache (if present/required). Detect EDO memory module. Size memory partition boundaries. Disable all memory holes. The 512640KB must be DRAM mapped. Gate A20 must be set and left set for POST. Initialize timer channel 2 for speaker. Initialize timer channel 0 for system timer. Clear pending parity errors; disable and clear parity, reactivate parity. Enter flat mode. Test the first 2MB of system memory. Get minimum memory partition size and test memory. Remap SIMMs if failure detected and remapping supported. Display error message and halt if remapping not supported. After memory test, clear pending parity errors. Disable and clear parity, set bits to reactivate parity. Set up stack for POST. Enable enhanced POST. Shadow FE00h block. Look for the location of dispatcher in the packing list. Call decompression dispatcher Init function. Make F000h DRAM R/W enabled. Force use of EDI. Actively dispatch BIOS. Initialize I/O cards in slots. Enable extended NMI sources. Test extended NMI sources. Display EISA error message, if any. Get keyboard controller vendor; program the keyboard controller. Enable extended NMI sources. Initialize mouse.

NoteSome port 80 codes are listed more than once because they test multiple functions. For example, code 0EBh tests both for the location of dispatcher in the packing list and for calling the decompression dispatcher Init function.

Phoenix BIOS Error Codes

Phoenix BIOS Error CodesPhoenix BIOS Text Error MessagesTable 13 Phoenix BIOS Text Error MessagesExplanation Drive A: is present but fails the POST diskette tests. Check that the drive is defined with the proper diskette type in Setup and that the disk drive is installed correctly. Extended memory not working or not configured properly at offset nnnn. The hexadecimal number nnnn is a map of the bits at the RAM address (System, Extended, or Shadow memory) that failed the memory test. Each 1 in the map indicates a failed bit. Fixed disk is not working or not configured properly. Check to see if fixed disk is installed properly. Run Setup to be sure the fixed-disk type is correctly identified. Type of diskette drive for drive A: not correctly identified in Setup. Problem with NVRAM (CMOS) access. The keyboard controller failed test. Try replacing the keyboard. Keyboard not working. BIOS discovered a stuck key and displays the scan code nn for the stuck key. Unlock the system to proceed. Monitor type not correctly identified in Setup. Operating system cannot be located on either drive A: or C:. Enter Setup and see if fixed disk and drive A: are properly identified. Parity error found in the system bus. BIOS attempts to locate the address and display it on the screen. If it cannot locate the address, it displays ????. Parity error found in the I/O bus. BIOS attempts to locate the address and display it onscreen. If it cannot locate the address, it displays ????. Displayed after any recoverable error message. Press F1 to start the boot process or F2 to enter Setup and change any settings. Real-time clock fails BIOS test. Might require motherboard repair. Shadow RAM failed at offset nnnn of the 64KB block at which the error was detected. The CMOS clock battery indicator shows the battery is dead. Replace the battery and run Setup to reconfigure the system. RAM cache failed the BIOS test. BIOS disabled the cache. System CMOS RAM has been corrupted or modified incorrectly, perhaps by an application program that changes data stored in CMOS. Run Setup and reconfigure the system either by getting the default values or making your own selections. System RAM failed at offset nnnn of the 64KB block at which the error was detected. The timer test failed. Requires repair of system motherboard. Error Message Diskette drive A error

Extended RAM Failed at offset: nnnn Failing Bits: nnnn

Fixed Disk 0 Failure Fixed Disk 1 Failure Fixed Disk Controller Failure Incorrect Drive A type run SETUP Invalid NVRAM media type Keyboard controller error Keyboard error Keyboard error nn Keyboard locked Unlock key switch Monitor type does not match CMOS - Run SETUP Operating system not found Parity Check 1 Parity Check 2 Press to resume, to Setup Real-time clock error Shadow RAM Failed at offset: nnnn System battery is dead Replace and run SETUP System cache error Cache disabled System CMOS checksum bad - run SETUP

System RAM Failed at offset: nnnn System timer error

Technical Reference

Phoenix BIOS Beep CodesTable 14Beeps 1-2-2-3 1-3-1-1 1-3-1-3 1-3-3-1 1-3-3-2 1-3-3-3 1-3-4-1 1-3-4-3 1-4-1-1 2-1-2-2 2-1-2-3 2-2-3-1 2-2-4-1 1-2

Phoenix BIOS Beep CodesPort 80h Code 16h 20h 22h 28h 29h 2Ah 2Ch 2Eh 30h 45h 46h 58h 5Ch 98h Explanation BIOS ROM checksum Test DRAM refresh Test keyboard controller Autosize DRAM Initialize POST memory manager Clear 512KB base RAM RAM failure on address line xxxx RAM failure on data bits xxxx of low byte of memory bus RAM failure on data bits xxxx of high byte of memory bus POST device initialization Check ROM copyright notice Test for unexpected interrupts Test RAM between 512640KB Search for option ROMs. One long and two short beeps on checksum failure

Phoenix BIOS POST CodesTable 15Code 02h 03h 04h 06h 08h 09h 0Ah 0Bh 0Ch 0Eh 0Fh 10h 11h 12h 13h 14h 16h 17h 18h 1Ah

Phoenix BIOS POST CodesPOST Operation in Progress Verify real mode Disable non-maskable interrupt (NMI) Get processor type Initialize system hardware Initialize chipset with initial POST values Set IN POST flag Initialize CPU registers Enable CPU cache Initialize caches to initial POST values Initialize I/O component Initialize the local bus IDE Initialize power management Load alternate registers with initial POST values Restore CPU control word during warm boot Initialize PCI bus mastering devices Initialize keyboard controller BIOS ROM checksum Initialize cache before memory autosize 8254 timer initialization 8237 DMA controller initialization

Phoenix BIOS Error CodesCode 1Ch 20h 22h 24h 26h 28h 29h 2Ah 2Ch 2Eh 2Fh 30h 32h 33h 34h 35h 36h 37h 38h 39h 3Ah 3Ch 3Dh 40h 42h 44h 45h 46h 47h 48h 49h 4Ah 4Bh 4Ch 4Eh 50h 51h 52h 54h 56h 58h 59h 5Ah POST Operation in Progress Reset programmable interrupt controller Test DRAM refresh Test keyboard controller Set ES segment register to 4GB Enable A20 line Autosize DRAM Initialize POST memory manager Clear 512KB base RAM RAM failure on address line xxxx* RAM failure on data bits xxxx* of low byte of memory bus Enable cache before system BIOS shadow RAM failure on data bits xxxx* of high byte of memory bus Test CPU bus-clock frequency Initialize POST dispatch manager Test CMOS RAM Initialize alternate chipset registers Warm start shut down Reinitialize the chipset (motherboard only) Shadow system BIOS ROM Reinitialize the cache (motherboard only) Autosize cache Configure advanced chipset registers Load alternate registers with CMOS valuesnew Set Initial CPU speed new Initialize interrupt vectors Initialize BIOS interrupts POST device initialization Check ROM copyright notice Initialize manager for PCI option ROMs Check video configuration against CMOS RAM data Initialize PCI bus and devices Initialize all video adapters in system Display QuietBoot screen Shadow video BIOS ROM Display BIOS copyright notice Display CPU type and speed Initialize EISA motherboard Test keyboard Set key click if enabled Enable keyboard Test for unexpected interrupts Initialize POST display service Display prompt Press F2 to enter SETUP (continues)

Technical Reference Table 15Code 5Bh 5Ch 60h 62h 64h 66h 67h 68h 69h 6Ah 6Ch 6Eh 70h 72h 74h 76h 7Ah 7Ch 7Eh 80h 81h 82h 83h 84h 85h 86h 87h 88h 89h 8Ah 8Bh 8Ch 8Fh 90h 91h 92h 93h 94h 95h 96h 97h 98h 99h

ContinuedPOST Operation in Progress Disable CPU cache Test RAM between 512640KB Test extended memory Test extended memory address lines Jump to UserPatch1 Configure advanced cache registers Initialize multiprocessor APIC Enable external and processor caches Setup System Management mode (SMM) area Display external L2 cache size Display shadow area message Display possible high address for UMB recovery Display error messages Check for configuration errors Test real-time clock Check for keyboard errors Test for key lock on Set up hardware interrupt vectors Initialize coprocessor if present Disable onboard Super I/O ports and IRQs Late POST device initialization Detect and install external RS232 ports Configure non-MCD IDE controllers Detect and install external parallel ports Initialize PC-compatible PnP ISA devices Reinitialize onboard I/O ports Configure motherboard configurable devices Initialize BIOS data area Enable non-maskable interrupts (NMIs) Initialize extended BIOS data area Test and initialize PS/2 mouse Initialize diskette controller Determine number of ATA drives Initialize hard-disk controllers Initialize local-bus hard-disk controllers Jump to UserPatch2 Build MPTABLE for multiprocessor boards Disable A20 address line (Rel. 5.1 and earlier) Install CD-ROM for boot Clear huge ES segment register Fix up multiprocessor table Search for option ROMs Check for S.M.A.R.T. drive

Phoenix BIOS Error CodesCode 9Ah 9Ch 9Eh 9Fh A0h A2h A4h A8h AAh ACh AEh B0h B2h B4h B5h B6h B8h B9h Bah BBh BCh BDh BEh BFh C0h C1h C2h C3h C4h E0h E1h E2h E3h E4h E5h E6h E7h E8h E9h EAh EBh ECh EDh POST Operation in Progress Shadow option ROMs Set up power management Enable hardware interrupts Determine number of ATA and SCSI drives Set time of day Check key lock Initialize typematic rate Erase F2 prompt Scan for F2 key stroke Enter SETUP Clear IN POST flag Check for errors POST done; prepare to boot operating system One short beep before boot Terminate QuietBoot Check password (optional) Clear global descriptor table Clean up all graphics Initialize DMI parameters Initialize PnP Option ROMs Clear parity checkers Display MultiBoot menu Clear screen (optional) Check virus and backup reminders Try to boot with INT 19h Initialize POST Error Manager (PEM) Initialize error logging Initialize error display function Initialize system error handler Initialize the chipset Initialize the bridge Initialize the processor Initialize system timer Initialize system I/O Check force recovery boot Checksum BIOS ROM Go to BIOS Set huge segment Initialize multiprocessor Initialize OEM special code Initialize PIC and DMA Initialize memory type Initialize memory size (continues)

Technical Reference Table 15Code EEh EFh F0h F1h F2h F3h F4h F5h F6h F7h

ContinuedPOST Operation in Progress Shadow boot block System memory test Initialize interrupt vectors Initialize runtime clock Initialize video Initialize beeper Initialize boot Clear huge segment Boot to mini-DOS Boot to full DOS

If the BIOS detects error 2C, 2E, or 30 (base 512KB RAM error), it displays an additional word-bitmap (xxxx) indicating the address line or bits that failed. For example, 2C 0002 means address line 1 (bit one set) has failed. 2E 1020 means data bits 12 and 5 (bits 12 and 5 set) have failed. The BIOS also sends this bitmap to the port-80 LED display. It first displays the check point code, followed by a delay, the high-order byte, another delay, and then the low-order byte of the error. It repeats this sequence continuously. Even with this information, normally you wont be able to replace the individual chips that are bad; youll have to replace the entire bank of memory instead.

Microid Research (MR) BIOS Error CodesMicroid Research Beep CodesThe MR BIOS generates patterns of high and low beeps to signal an error condition. The beep codes are shown in Table 16.

Table 1603h 04h 05h 08h 09h 09h 0Ah 0Ah 0Ah 0Ah 0Ah 0Ah 0Ah 0Bh 0Bh

Microid Research Beep CodesBeep Codes LH-LLL LH-HLL LH-LHL LH-HHL LH-LLH LH-HLH LH-LLLL LH-HLLL LH-LHLL LH-HHLL LH-LLHL LH-HLHL LH-LHHL LH-HHHL LH-LLLH Error Messages ROM-BIOS Checksum Failure DMA Page Register Failure Keyboard Controller Selftest Failure Memory Refresh Circuitry Failure Master (16-bit) DMA Controller Failure Slave (8-bit) DMA Controller Failure Base 64KB Pattern Test Failure Base 64KB Parity Circuitry Failure Base 64KB Parity Error Base 64KB Data Bus Failure Base 64KB Address Bus Failure Base 64KB Block Access Read Failure Base 64KB Block Access Read/Write Failure Master 8259 (Port 21) Failure Slave 8259 (Port A1) Failure

Port 80h Code

Microid Research (MR) BIOS Error CodesPort 80h Code 0Ch 0Ch 0Ch 0Ch 0Ch 0Ch 0Dh 0Eh 0Eh 0Fh 0Fh 10h Beep Codes LH-HLLH LH-LHLH LH-HHLH LH-LLHH LH-HLHH LH-LHHH LH-HHHH LH-LLLLH LH-HLLLH LH-LHLLH LH-HHLLH LH-LLHLH Error Messages Master 8259 (Port 20) Interrupt Address Error Slave 8259 (Port A0) Interrupt Address Error 8259 (Port 20/A0) Interrupt Address Error Master 8259 (Port 20) Stuck Interrupt Error Slave 8259 (Port A0) Stuck Interrupt Error System Timer 8254 CH0/IRQ0 Interrupt Failure 8254 Channel 0 (System Timer) Failure 8254 Channel 2 (Speaker) Failure 8254 OUT2 (Speaker Detect) Failure CMOS RAM Read/Write Test Failure RTC Periodic Interrupt/IRQ8 Failure Video ROM Checksum Failure at Address XXXX, Mono Card Memory Error at Address XXXX, Mono Card Memory Address Line Error at Address XXXX, Color Graphics Card Memory Error at Address XXXX, Color Graphics Card Address Line Error at Address XXXX Real Time Clock (RTC) Battery is Discharged Battery Backed Memory (CMOS) is Corrupt Keyboard Controller Failure Memory Parity Error

11h 11h 12h 14h 18h 19h 14h 18h 19h 14h 18h 19h

(None) (None) LH-HLHLH LH-LHHLH

LH-HHHLH

I/O Channel Error

(None)

12h 17h 17h 17h 1Ah 1Ah 1Eh

(None) LH-LLLHH LH-HLLHH (None) LH-LHLHH (None) (None)

1Fh

(None)

RAM Pattern Test Failed at XXXX, Parity Circuit Failure in Bank XXXX, Data Bus Test Failed: Address XXXX, Address Line Test Failed at XXXX, Block Access Read Failure at Address XXXX, Block Access Read/Write Failure: Address XXXX, Banks Decode to Same Location: XXXX and YYYY Keyboard Error - Stuck Key Keyboard Failure or no 15hKeyboard Present A20 Test Failure Due to 8042 Timeout A20 Gate Stuck in Disabled State (A20=0) A20 Gate Stuck in Asserted State (A20 Follows CPU) Real Time Clock (RTC) is Not Updating Real Time Clock (RTC) Settings are Invalid Diskette CMOS Configuration is Invalid, Diskette Controller Failure, Diskette Drive A: Failure, Diskette Drive B: Failure Fixed Disk CMOS Configuration is Invalid, Fixed Disk C:(80) Failure, Fixed Disk D:(81) Failure, Please Wait for Fixed Disk to Spin Up (continues)

Technical Reference Table 1620h

ContinuedBeep Codes (None) Error Messages Fixed Disk, Diskette, Serial Port, Parallel Port, Video, Memory, or Numeric Coprocessor Configuration Change System Key is in Locked Position - Turn Key to Unlocked Position Adapter ROM Checksum Failure at Address XXXX

Port 80h Code

21h 29h L = Low tone H = High tone

(None) (None)

Microid Research POST CodesTable 17POST Code 00h 01h 02h 03h 04h 05h 06h 07h 08h 09h 0Ah 0Bh 0Ch 0Dh 0Eh 0Fh 13h 10h 11h 12h 14h 15h 16h 17h 18h 19h

Microid Research POST CodesMeaning Cold-Boot commences. (Not seen with warm boot). HOOK 00. OEM specific, typically resets chipset to default. Disable critical I/O: 6845s, 8237s, 765, and parity latches. BIOS checksum test. Page register test. (Ports 818F). 8042 (Keyboard Controller) Selftest. Gang Port Init: 8237 m/s, 8254 ch2/1, RTC REG F/A, 8259 m/s. HOOK 01. OEM specific, typically disables cache, shadow. Refresh toggle test (PORTB). Pattern test master/slave 8237s, eight 16-bit regs each. Base 64KB memory test. Pattern test master/slave 8259 mask regs. 8259/IRQ tests, purge powerup ints. 8254 channel-0 test and initialization. 8254 channel-2 toggle test, test speaker circuitry. RTC tests/inits: Init REG-B, write/readback NVRAM, PIE test. HOOK 02. OEM specific, select 8MHz bus. Video Initialization. CMOS checksum test. Signon msg, Accept KB BAT, perform first try KB init, cold-boot delay. Size/Test base memory (low 64KB already done). Perform second try KB init, if necessary. HOOK 03. OEM specific. Size/test cache. Test A20 gate, off then on. Size/Test extended memory. HOOK 04 and Size/Test system memory (special OEM memory).

IBM BIOS Beep and Alphanumeric Error CodesPOST Code 1Ah 1Bh 1Ch 1Dh 1Eh 1Fh 20h 21h 22h 23h 24h 28h 25h 26h 27h 29h 2Ah 2Bh 2Ch 2Dh 2Eh 2Fh Meaning Test RTC Update-In-Progress and validate time. Serial port determination, off-board/onboard. Parallel port determination, off-board/onboard. Coprocessor determination/initialization. Floppy controller test/determination, CMOS validation. Fixed Disk controller test/determination, CMOS validation. Rigorous CMOS parameter validation, display other config. changes. Front-Panel lock check, wait for user to acknowledge errors. Set NumLock, Password-Security Trap, dispatch to Setup utility. HOOK 05. OEM specific. Set typematic rate. HOOK 06. OEM specific, typically enables shadow, cache, turbo. Floppy subsystem initialization. Fixed subsystem initialization. ACK errors, set primary adapter video mode. Disable A20-gate, set low stack, install C800-E000 ROMs. ACK errors, set video mode, set DOS time variables from RTC. Enable parity checking and NMI. Install E000 ROM. ACK errors. HOOK 07. OEM specific. Log-in EMS (if built-in). Pass control to INT19 (boot disk).

IBM BIOS Beep and Alphanumeric Error CodesAfter completing the POST, an audio code indicates either a normal condition or that one of several errors has occurred.

Table 18

IBM POST Audio Error CodesSound Graph Description Normal POSTsystem OK POST errorerror code on display Power supply, system board Power supply, system board Power supply, system board System board Video adapter (MDA/CGA) Video adapter (EGA/VGA) 3270 keyboard card

Audio Code 1 short beep 2 short beeps No beep Continuous beep Repeating short beeps 1 long, 1 short beep 1 long, 2 short beeps 1 long, 3 short beeps 3 long beeps

Technical ReferenceIBM has developed a system in which the first part of the error code indicates the device the error involves, and the last part indicates the exact error meaning. One of the biggest problems with these error codes is that IBM does not publish a complete list of the errors in any single publication; instead, it details specific error codes in many different publications. I have researched these codes for many years; the following table represents all the codes I have found meanings for. These codes have been selected from a number of sources, including all IBMs technical-reference and hardware-maintenance service manuals.

Table 19Code

IBM POST and Diagnostics Error CodesDescription

1xx101 102 102 103 103 104 105 106 107 108 109 110 111 112 113 114 115 116 118 119 120 121 121 131 131 132 133 134 151 152 160 161

System Board ErrorsSystem board interrupt failure (unexpected interrupt). System board timer failure. PS/2; real-time clock (RTC)/64 byte CMOS RAM test failure. System board timer interrupt failure. PS/2; 2KB CMOS RAM extension test failure. System board protected mode failure. System board 8042 keyboard controller command failure. System board converting logic test failure. System board non-maskable interrupt (NMI) test failure; hot NMI. System board timer bus test failure. System board memory select error; low MB chip select test failed. PS/2 system board parity check error (PARITY CHECK 1). PS/2 I/O channel (bus) parity check error (PARITY CHECK 2). PS/2 Micro Channel Arbitration error; watchdog time-out (NMI error). PS/2 Micro Channel Arbitration error; DMA arbitration time-out (NMI error). PS/2 external ROM checksum error. Cache parity error, ROM checksum error or DMA error. System board port read/write failure. System board parity or L2-cache error during previous power-on. E Step level 82077 (floppy controller) and 2.88MB drive installed (not supported). Microprocessor self-test error. 256KB ROM checksum error (second 128KB bank). Unexpected hardware interrupts occurred. PC system board cassette port wrap test failure. Direct memory access (DMA) compatibility registers error. Direct memory access (DMA) extended registers error. Direct memory access (DMA) verify logic error. Direct memory access (DMA) arbitration logic error. Battery or CMOS RAM failure. Real-time clock or CMOS RAM failure. PS/2 system board ID not recognized. CMOS configuration empty (dead battery).

IBM BIOS Beep and Alphanumeric Error CodesCode Description

1xx162 163 164 165 166 167 168 169 170 170 171 171 172 172 173 173 174 174 175 175 176 177 177 178 179 180x 181 182 183 183 184 184 185 186 187 188 189 191 194 199

System Board ErrorsCMOS checksum error or adapter ID mismatch. CMOS error; date and time not set (clock not updating). Memory size error; CMOS setting does not match memory. PS/2 Micro Channel adapter ID and CMOS mismatch. PS/2 Micro Channel adapter time-out error (card busy). PS/2 CMOS clock not updating. CMOS configuration error (math coprocessor). System board and processor card configuration mismatch. Run Setup. ASCII setup conflict error. PC Convertible; LCD not in use when suspended. Rolling-bit-test failure on CMOS shutdown address byte. PC Convertible; base 128KB checksum failure. Rolling-bit-test failure on NVRAM diagnostic byte. PC Convertible; diskette active when suspended. Bad CMOS/NVRAM checksum. PC Convertible; real-time clock RAM verification error. Bad configuration. PC Convertible; LCD configuration changed. Bad EEPROM CRC #1. PC Convertible; LCD alternate mode failed. Tamper evident. Bad PAP (privileged-access password) CRC. Bad EEPROM. Bad EEPROM. NVRAM error log full. Sub Address data error, where x = the slot number that caused the error. Unsupported configurations. Privileged-access switch (JMP2) is not in the write-enable position. PAP is needed to boot from the system programs. Privileged-access password required. Bad power-on password checksumerase it. Bad power-on password. Bad startup sequence. Password-protection hardware error. Serial number error. Bad EEPROM checksum CRC #2. Excessive incorrect password attempts. 82385 cache controller test failure. System board memory error. User indicated INSTALLED DEVICES list is not correct. (continues)

Technical Reference Table 19Code

ContinuedDescription

2xx20x 201 202 203 204 205 207 210 211 212 213 215 216 221 225 230 231 231 235 241 251

Memory (RAM) ErrorsMemory error. Memory test failure; error location might be displayed. Memory address error; lines 0015. Memory address error; lines 1623 (ISA) or 1631 (MCA). Memory remapped due to error (run diagnostics again). Base 128KB memory error; memory remapped. ROM failure. System board memory parity error. PS/2 memory; base 64KB on system board failed. Watchdog time-out error (reported by NMI interrupt handler). DMA bus arbitration time-out (reported by NMI interrupt handler). PS/2 memory; base 64KB on daughter/SIP 2 failed. PS/2 memory; base 64KB on daughter/SIP 1 failed. PS/2 memory; ROM to RAM copy failed (ROM shadowing). PS/2 memory; wrong-speed memory on system board, unsupported SIMM. Overlapping adapter and planar memory (Family 1). Non-contiguous adapter memory installed (Family 1). 2/4-16MB Enhanced 386 memory adapter; memory module 1 failed. Stuck data line on memory module, microprocessor or system board. 2/4-16MB Enhanced 386 memory adapter; memory module 2 failed. 2/4-16MB Enhanced 386 memory adapter; memory module 3 failed.

3xx301 302 303 304 305 306 341 342 343 365 366 367

Keyboard ErrorsKeyboard reset or stuck key failure (SS 301, SS = scan code in hex). System unit keylock is locked. Keyboard-to-system board interface error; keyboard controller failure. Keyboard or system board error; keyboard clock high. Keyboard +5v dc error; PS/2 keyboard fuse (on system board) error. Unsupported keyboard attached. Keyboard error. Keyboard cable error. Keyboard LED card or cable failure. Keyboard LED card or cable failure. Keyboard interface cable failure. Keyboard LED card or cable failure.

4xx 4xx401 401 408

Monochrome Display Adapter (MDA) Errors PS/2 System Board Parallel Port ErrorsMonochrome memory, horizontal sync frequency, or video test failure. PS/2 system board parallel port failure. User indicated display attributes failure.


4xx416 424 432

PS/2 System Board Parallel Port ErrorsUser indicated character set failure. User indicated 80525 mode failure. Parallel port test failure; monochrome display adapter.

5xx*501 501 503 508 516 524 532 540 548 556 564

Color Graphics Adapter (CGA) ErrorsCRT error. CGA memory, horizontal sync frequency, or video test failure. CGA adapter controller failed. User indicated display attribute failure. User indicated character set failure. User indicated 8025 mode failure. User indicated 4025 mode failure. User indicated 320200 graphics mode failure. User indicated 640200 graphics mode failure. User indicated light-pen test failed. User indicated paging test failure.

6xx601 602 603 604 605 606 607 608 610 611 612 613 614 615 616 621 622 623 624 625 626 627 628 630

Floppy Drive/Controller ErrorsFloppy drive/controller POST failure; disk drive or controller error. Diskette boot sector is not valid. Diskette size error. Non-media sense. Diskette drive locked. Diskette verify test failure. Write-protect error. Drive-command error. Diskette initialization failure; track 0 bad. Drive time-out error. Controller chip (NEC) error. Direct memory access (DMA) error. Direct memory access (DMA) boundary overrun error. Drive index timing error. Drive speed error. Drive seek error. Drive cyclic redundancy check (CRC) error. Sector not found error. Address mark error. Controller chip (NEC) seek error. Diskette data compare error. Diskette change error. Diskette removed. Index stuck high; drive A:. (continues)



6xx631 632 633 640 641 642 643 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660

Floppy Drive/Controller ErrorsIndex stuck low; drive A:. Track 0 stuck off; drive A:. Track 0 stuck on; drive A:. Index stuck high; drive B:. Index stuck low; drive B:. Track 0 stuck off; drive B:. Track 0 stuck on; drive B:. No index pulse. Drive track 0 detection failed. No transitions on read data line. Format test failed. Incorrect media type in drive. Drive speed error. Format failure. Verify failure. Read failure. Write failure. Controller error. Drive failure. Write-protect stuck protected. Changeline stuck changed. Write-protect stuck unprotected. Changeline stuck unchanged.

7xx701 702 703 704 705 706 707 708 709 710 711 712 713

Math Coprocessor ErrorsMath coprocessor presence/initialization error. Exception errors test failure. Rounding test failure. Arithmetic test 1 failure. Arithmetic test 2 failure. Arithmetic test 3 (80387 only) failure. Combination test failure. Integer load/store test failure. Equivalent expressions errors. Exception (interrupt) errors. Save state (FSAVE) errors. Protected mode test failure. Special test (voltage/temperature sensitivity) failure.

9xx901 902

Parallel Printer Adapter ErrorsPrinter adapter data register latch error. Printer adapter control register latch error.


9xx903 904 910 911 912 913 914 915 916 917 92x

Parallel Printer Adapter ErrorsPrinter adapter register address decode error. Printer adapter address decode error. Status line(s) wrap connector error. Status line bit 8 wrap error. Status line bit 7 wrap error. Status line bit 6 wrap error. Status line bit 5 wrap error. Status line bit 4 wrap error. Printer adapter interrupt wrap error. Unexpected printer adapter interrupt. Feature register error.

10xx1001 1002 1003 1004 1010 1011 1012 1013 1014 1015 1016 1017 102x

Alternate Parallel Printer Adapter ErrorsPrinter adapter data register latch error. Printer adapter control register latch error. Printer adapter register address decode error. Printer adapter address decode error. Status line(s) wrap connector error. Status line bit 8 wrap error. Status line bit 7 wrap error. Status line bit 6 wrap error. Status line bit 5 wrap error. Status line bit 4 wrap error. Printer adapter interrupt wrap error. Unexpected printer adapter interrupt. Feature register error.

11xx1101 1102 1102 1103 1103 1104 1106 1107 1108 1109 1110 1111 1112 1113

Primary Async Communications (Serial COM1:) Errors16450/16550 chip error; serial port A error. Card selected feedback error. PC Convertible internal modem test failed. Port 102h register test failure. PC Convertible internal modem dial tone test 1 failed. PC Convertible internal modem dial tone test 2 failed. Serial option cannot be put to sleep. Cable error. Interrupt request (IRQ) 3 error. Interrupt request (IRQ) 4 error. 16450/16550 chip register failure. Internal wrap test of 16450/16550 chip modem control line failure. External wrap test of 16450/16550 chip modem control line failure. 16450/16550 chip transmit error. (continues)



11xx1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1148 1149 1150 1151 1152 1153 1154 1155

Primary Async Communications (Serial COM1:) Errors16450/16550 chip receive error. 16450/16550 chip receive error; data not equal to transmit data. 16450/16550 chip interrupt function error. 16450/16550 chip baud rate test failure. 16450/16550 chip receive external data wrap test failure. 16550 chip first-in/first-out (FIFO) buffer failure. Interrupt enable register error; all bits cannot be set. Interrupt enable register error; all bits cannot be reset. Interrupt pending; stuck on. Interrupt ID register; stuck on. Modem control register error; all bits cannot be set. Modem control register error; all bits cannot be reset. Modem status register error; all bits cannot be set. Modem status register error; all bits cannot be reset. Interrupt ID error. Cannot force overrun error. No modem status interrupt. Invalid interrupt pending. No data ready. No data available interrupt. No transmit holding interrupt. No interrupts. No received sine status interrupt. No receive data available. Transmit holding register not empty. No modem status interrupt. Transmit holding register not empty. No interrupts. No interrupt 4. No interrupt 3. No data transferred. Maximum baud rate error. Minimum baud rate error. Time-out error. Invalid data returned. Modem status register error. No data set ready and delta data set ready. No data set ready. No delta data set ready. Modem status register not clear. No clear to send and delta clear to send.


11xx1156 1157

Primary Async Communications (Serial COM1:) ErrorsNo clear to send. No delta clear to send.

12xx1201 1202 1203 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239

Alternate Async Communications (Serial COM2:, COM3:, and COM4:) Errors16450/16550 chip error. Card selected feedback error. Port 102h register test failure. Serial option cannot be put to sleep. Cable error. Interrupt request (IRQ) 3 error. Interrupt request (IRQ) 4 error. 16450/16550 chip register failure. Internal wrap test of 16450/16550 chip modem control line failure. External wrap test of 16450/16550 chip modem control line failure. 16450/16550 chip transmit error. 16450/16550 chip receive error. 16450/16550 chip receive error; data not equal to transmit data. 16450/16550 chip interrupt function error. 16450/16550 chip baud rate test failure. 16450/16550 chip receive external data wrap test failure. 16550 chip first-in first-out (FIFO) buffer failure. Interrupt enable register error; all bits cannot be set. Interrupt enable register error; all bits cannot be reset. Interrupt pending; stuck on. Interrupt ID register; stuck on. Modem control register error; all bits cannot be set. Modem control register error; all bits cannot be reset. Modem status register error; all bits cannot be set. Modem status register error; all bits cannot be reset. Interrupt ID error. Cannot force overrun error. No modem status interrupt. Invalid interrupt pending. No data ready. No data available interrupt. No transmit holding interrupt. No interrupts. No received sine status interrupt. No receive data available. Transmit holding register not empty. No modem status interrupt. (continues)



12xx1240 1241 1242 1243 1244 1245 1246 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257

Alternate Async Communications (Serial COM2:, COM3:, and COM4:) ErrorsTransmit holding register not empty. No interrupts. No interrupt 4. No interrupt 3. No data transferred. Maximum baud rate error. Minimum baud rate error. Time-out error. Invalid data returned. Modem status register error. No data set ready and delta data set ready. No data set ready. No delta data set ready. Modem status register not clear. No clear to send and delta clear to send. No clear to send. No delta clear to send.

13xx1301 1302

Game Control Adapter ErrorsGame control adapter test failure. Joystick test failure.

14xx1401 1402 1403 1404 1405 1406

Matrix Printer ErrorsPrinter test failure. Printer not ready error. Printer no-paper error. System board time-out. Parallel adapter failure. Printer presence test failed.

15xx1501 1510 1511 1512 1513 1514 1515 1516 1517

Synchronous Data Link Control (SDLC) Communications Adapter ErrorsSDLC adapter test failure. 8255 Port B failure. 8255 Port A failure. 8255 Port C failure. 8253 Timer #1 did not reach terminal count. 8253 Timer #1 stuck on. 8253 Timer #0 did not reach terminal count. 8253 Timer #0 stuck on. 8253 Timer #2 did not reach terminal count.


15xx1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1547 1548 1549

Synchronous Data Link Control (SDLC) Communications Adapter Errors8253 Timer #2 stuck on. 8273 Port B error. 8273 Port A error. 8273 command/read time-out. Interrupt Level 4 failure. Ring Indicate stuck on. Receive Clock stuck on. Transmit Clock stuck on. Test Indicate stuck on. Ring Indicate not on. Receive Clock not on. Transmit Clock not on. Test Indicate not on. Data Set Ready not on. Carrier Detect not on. Clear to Send not on. Data Set Ready stuck on. Carrier Detect stuck on. Clear to Send stuck on. Interrupt Level 3 failure. Receive interrupt results error. Wrap data compare error. Direct memory access Channel 1 error. Direct memory access Channel 1 error. 8273 error-checking or status-reporting error. Stray interrupt Level 4. Stray interrupt Level 3. Interrupt presentation sequence time-out.

16xx1604 1608 1624 1634 1644 1652 1654 1658 1662 1664 1668

Display Station Emulation Adapter (DSEA) Errors (5520, 525x)DSEA DSEA DSEA DSEA DSEA DSEA DSEA DSEA DSEA DSEA DSEA or twinaxial network error. or twinaxial network error. error. error. error. error. error. error. interrupt level error. error. interrupt level error. (continues)



16xx1669 1674 1674 1684 1688

Display Station Emulation Adapter (DSEA) Errors (5520, 525x)DSEA DSEA DSEA DSEA DSEA diagnostics error; use 3.0 or higher. diagnostics error; use 3.0 or higher. station address error. device address error. device address error.

17xx1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1720 1726 1730 1731 1732 1733 1735 1736 1737 1738 1739 1740 1750 1751 1752 1753 1754

ST-506/412 Fixed Disk and Controller ErrorsFixed disk general POST error. Drive/controller time-out error. Drive seek error. Controller failed. Drive sector not found error. Write fault error. Drive track 0 error. Head select error. Error correction code (ECC) error. Sector buffer overrun. Bad address mark. Internal controller diagnostics failure. Data compare error. Drive not ready. Track 0 indicator failure. Diagnostics cylinder errors. Surface read errors. Hard drive type error. Bad diagnostics cylinder. Data compare error. Controller error. Controller error. Controller error. BIOS undefined error return. Bad command error. Data corrected error. Bad track error. Bad sector error. Bad initialization error. Bad sense error. Drive verify failure. Drive read failure. Drive write failure. Drive random read test failure. Drive seek test failure.


17xx1755 1756 1757 1780 1781 1782 1790 1791

ST-506/412 Fixed Disk and Controller ErrorsController failure. Controller error-correction code (ECC) test failure. Controller head-select failure. Seek failure; drive 0. Seek failure; drive 1. Controller test failure. Diagnostic cylinder read error; drive 0. Diagnostic cylinder read error; drive 1.

18xx1801 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821

I/O Expansion Unit ErrorsI/O expansion unit POST failure. Enable/disable failure. Extender card wrap test failure; disabled. High-order address lines failure; disabled. Wait state

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