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Contents Section Page
Title & Contents (this page) 1Block Diagram 2Section & Signal Name Descriptions 3Timing (clock & slice) & Initialisation 4Timing (bit & digit) 5Keyboard 6Control (part 1) 7Control (part 2) 8Control (part 3) 9Control (part 4) 10Q Counter & DP Counter 11J Counter 12P Counter 13N Register 14M Register 15Main Register (A,B,C,D,E) Data Switches 16Main Registers (A,B,C,D,E) 17X Register 18Y Register 19Misc. Registers 20Display 21Power Supply & Unused Gates 22Timing Diagram, Bit Codes & IC Pinouts 23Connectors 24
Sony SOBAX 2500Calculator
Notes
• The symbol denotes V+4.
• connection between different sections. connection limited to same section.
Arrows indicate direction of signal or energy flow.
• A lowercase ‘n’ at the beginning of a symbol name indicates the logical NOT operation.
• Resistance in ohms unless otherwise indicated.
• Capacitance in microfarads unless otherwise indicated.
• The Acoustic Delay Line is based on magnetostrictive principles.See the article “Magnetostrictive Delay Lines” in “Electronics World”, Jan. 1964.
• These drawings based on unit with Serial No. 620173 which contains a Board F marked with 1-539-224-12. Component values marked with “*” are the values for Board F marked with 1-539-224-11.
Log
• 1999 Sep-Nov: Initial drawing / bhilpert.
• 2005 Feb 19: MSYNC source corrected, comes from Q7 rather than Q8. Corrections to labels on flip-flops in display page.
• 2005 Feb 20: Some additional labeling of “*” components for board F.
• 2014 May: Backplane connectors correction for V+4/GND, numeric key coupling distinguished, other minor reorganisation.
Sony SOBAX 2500 CalculatorSection: Title & Contents
Page: 1 Rendition: 2014 May 7
This schematic has been derived through reverse engineering.This is not the manufacter’s schematic, nor is it based on the manufacturer’s schematic.
to all sections
Sony SOBAX 2500 CalculatorSection: Block Diagram
Page: 2 Rendition: 2014 May 7
Display Latchand Display
C Register
A Register
B Register
D Register
X Register
Y Register
F Register G Register
INA
INB
DDCOMP
YM
ACOMPBCE
AX
XN
AY
X
N?YA
XFA
BACOMP
DCOMP
N Register
KeyboardNumeral Keys
KeyboardFunction Keys
EP
M Register
N
N M
Y
X
D
AACOMP
J Counter
Q Counter
DP Counter
C
E
to all sections
Power Supply
to all sections
Timing
FA
P Counter
V Reg
W Reg
OVF Reg
1 bit reg 4-bit register 16 digit register
Keyboardmode switches,C-ALL, C-ENT,
<, >, DPand CHG-SIGN
keys
N
EP
AIN
BIN
CIN
DIN
EIN
EP
A
ACOMP
B
D
DCOMP
E Registers
M1 M2 M3 M4
M5 P7M6 P6M7 P5 P4 P3 P2 P1
Control
FD FC FB FA
KFD KFC KFB KFA
GD GC GB GA
KW K4 K2 K1
XW X4 X2 X1
DDISZ Reg
INTØD Reg
S A S M
Sony SOBAX 2500 CalculatorSection: Section & Signal Name Descriptions
Page: 3 Rendition: 2014 May 7
Section S i gna l Descr ip t ionTiming Master timing and power-on initialisation.
Ø Master clock.ØS… Sliced bit timing. The bits of the 15 main registers are interleaved in the Acoustic
Delay Line by slicing each ‘major’ bit into 16 parts. The remaining slice is used forsynchronizing the frequency of the master clock to the cycle time of the delay line.
ØB… ‘Major’ bit timing.ØD… Digit timing (4 major bits constitutes a digit).ØDINS During some calculation phases, the 16-digit cycle is extended one digit period by
inserting another ‘digit’ between ØD11 and ØD12. The inserted period is ØDINS.RDY Ready. Low when power is turned on, goes high after initialisation is complete.INITP Initialisation pulses. A stream of pulses during initialisation (not-ready).PWROFFP Power Off Pulse.
Keyboard The keyboard and encoders for numerals and functions.KMAN Manual mode.KAUTO Execute program mode.KLEARN Learn program mode.KOPER Operate mode.KCHECK Check program mode.KMAO Manual / Auto / Operate.KTON Tally mode on.KTREAD Tally read.KR54 5 up / 4 down rounding mode.KRDWN Round down mode (truncate).KRØD Selected digit pulse for rounding.KCA Clear all.KCE Clear entry.KSL Shift left.KSR Shift right.KSCS Shift or change sign.KDP Decimal point.KPS Program step (S key).KFA,KFB,KFC,KFD Encoded function keys. These are the same as FA, FB, FC, FD.K1,K2,K4,KW Encoded numeral keys.
Control Control registers & logic.F… 4 bit register for function keystrokes and program instructions to be executed.G… Secondary function register loaded from the F register.S… Assorted state registers.
All these registers clock on a 16-digit cycle (17 when ØDINS active).T… Misc control logic. These are combinations of the state registers.U… More control logic. These are combinations of the function register and state registers.AISNEG Indicates the number in the A register is negative.
(Appears to also be used for other purposes).DISNEG Indicates the number in the D register is negative.ANEGJ
Q Counter 16 squared counter. Counter for16 cycles of 16 or 17 digits.QQA
DP Counter Decimal point timing counter.DP Signal to the display to turn on the decimal point at the appropriate times.UNITØD Pulses during the digit which is currently the units digit.CHGSGN Change Sign.
J Counter Multi-use counter for fraction fill count, digit position to start zero blanking and more.JJA, JB, JC
Section S i gna l Descr ip t ionP Counter The program counter. This must select one of the 7 program registers in the E group as
well as track a position within the selected register.PØS Timing slice for selecting 1 of 7 program registers in the E register group.P1ST Program at beginning.PEXP Program memory expended.POVFPA
N Register 4-bit register for numeric keystrokes.N Bit stream from the N register.NPRESS Numeric key has been pressed.NPRESSA
M Register 4-bit register to indicate which memory is currently selected.M Bit stream from the M register.MØS Timing slice for selecting 1 of 7 memory registers in the E register group.MEM1 Memory 1 is selected.
Main Data Switches Data switches to select inputs to the Main Registers.AIN Bit stream into the A register.BINCINDINEINEIN_ENB Enable the input to the currently selected register in the E register group.ACOMP Complementary form of bit stream from the A register in accordance with AISNEG.DCOMP Complementary form of bit stream from the D register in accordance with DISNEG.EP Bit stream from the E register for program instruction purposes.
Main Registers 15 16-digit registers for the operands and program instructions.A Bit stream from the A register. The A register mimics the D register but with
zeroes (1000) mapped to 0000.B Bit stream from the B register.C Bit stream from the C register.D Bit stream from the D register. The D register contains the number being
displayed. Displayed zeroes are encoded as 1000 and blanked zeroes as 0000.E 11 16-digit registers shared between the 7 memories and program instructions.
4 of these registers are reserved for memories 1,2,3 and 4.4 are reserved for program instructions.The remaining 3 are shared by memories 5,6,7 and program instructions in reverseoverlapping order. Thus a long program will cut into memory 7, then memory 6 then 5.The maximum length of a program is (4+3)*16=112 instructions (functions).
MSYNC Signal from the delay line to automatic frequency control circuit for the master clock.
X Register 4-bit register for arithemetic and transferring numerals on their way from theD register to the display.
X Bit stream from the X register.X1,X2,X4,XW Numerals on their way to the display.XOVFCA Carry Flag.
Y Register 4-bit register.YYR54YA,YB,YC
Misc. RegistersINTØD Goes high during digits which are part of the integral portion of the number.RNDØDDDISZ Output from a register which assesses whether the current register D digit is zero.OVF Overflow latch.V 1-bit register.VA, VB, VCW 1-bit register.
10 3
680680 18K 18K
75pF 100pF
QF13C641
Sony SOBAX 2500 CalculatorSection: Timing (Clock & Slice) & Initialisation
Page: 4 Rendition: 2014 May 7
QF18C641
QF19C318A
1K
27K 27K
4.7K
5.6K
30pFQF33QF32*C641
560
560
QF31QF30*C641
220
0.015
100
QF28QF25*C1063
Ø
8.2K
30pF820
QF11C641
nØ
4716V
0.068
1S33275pF
1K
QF10C641
15K
NF8,10 NE7,9
TF15
4
3
F401
5
6
J
K
Q
nQ
2 C9
10
F401
8
7
J
K
Q
nQ
11 C9
10
F402
8
7
J
K
Q
nQ
11 C4
3
F402
5
6
J
K
Q
nQ
2 C9
F403
8
7
J
K
Q
nQ
11 C4
F403
5
6
J
K
Q
nQ
2 C4
3
E114
5
6
J
K
Q
nQ
2 C9
10
E114
8
7
J
K
Q
nQ
11 C
4
3
E113
5
6
J
K
Q
nQ
2 C9
10
E113
8
7
J
K
Q
nQ
11 C4
3
E112
5
6
J
K
Q
nQ
2 C9
10
E112
8
7
J
K
Q
nQ
11 C4
3
E110
5
6
J
K
Q
nQ
2 C9
10
E110
8
7
J
K
Q
nQ
11 C4
3
E109
5
6
J
K
Q
nQ
2 C9
10
E109
8
7
J
K
Q
nQ
11 C
NF26 NE25
TE27
100K
100K
10160V
POWER(closes when unit
is turned off)
V+200
68
2220K*
5150V
27K24K*
2.7K2.4K*
24K
4716V
3
2F304
4567
6
789
F309
NF23,25PWROFFPto main registers
QF20C634A
QF23QF28*C634A
68
3.325V
NF16 NA13
ND21
RDY
nRDY
ØS10
QF16C634A
QF17C634A
560QF14CS1303
QF15CS1303 120K
100K
4.7K
1K
10K
10K
22016V4
10 5F306
11
3
1212
F306
820820
5.6K
20pF 20pF
QF9C641
5.6K
QF12C641
TF12TF14
9
10
F305
8
7
J
K
Q
nQ
11 C4
3
F305
5
6
J
K
Q
nQ
2 C12 T 1 TØ
RDY
f12
f14
4
10 5F3032K
QF1C634A
4716V
22K6
987
F306
f22
f20
ØS0
5
2
F30741
113
12
7
6
1089
F307
nØØS14
nRDY
ØS10
nRDY
5
11
F3083241
12
7
6
8109
F308
RDY
ØB3
nØØS14ØB3
RDY
ØS10
MSYNCfrom main registers
ØD15•B3
ØD15•B3
ØD15•B3
NE11NF12
3
F310
4567
2nRDY nINITPNB10
ØD0ØB0
ØS1 ØS2 ØS3 ØS5 ØS6 ØS7
NF18
NE17
ØS0
NF15
NE15
ØS4
NF24
NE23
ØS8 ØS9 ØS11 ØS12 ØS13
NE21
NF22
ØS10
NE19
NF20
ØS14
f44 f30
1 T 12 T 1 T 12 T 1 T 12 T 1 T 12 TØ Ø Ø Ø Ø Ø ØØ
1 T12 T 12 T 1 T 12 T 1 T 1 T 12 TØ Ø Ø Ø Ø Ø ØØ
DE5 DE7
DE9 DE11 DE8 DE10 DE6 DE4 DE13
150
V–10
V–10
V–10
5
7
2A101
654 NA44
NkT
nØD0
9
10
A107
8
7
J
K
Q
nQ
11 C ØB34
3
A107
5
6
J
K
Q
nQ
2 C9
10
A106
8
7
J
K
Q
nQ
11 C4
3
A106
5 J
K
Q
nQ
2 C1
3
11122
nØD1
A111nØD3nØD7
nØD12
6
nA
3
8
1A101
91011
nØD1
12
7
2A102
654
nØD2
3
8
1A102
91011
nØD3
12
7
2A103
654
nØD4
3
8
1A103
91011
nØD5
12
7
2A104
654
nØD6
3
8
1A104
91011
nØD7
12
7
2A105
654
nØD8
3
8
1A105
91011
nØD9
12
7
2A108
654
nØD10
3
8
1A108
91011
nØD11
12
6
2A109543
nØD12
7
8
1A109
91011 nØD1312
7
2A110
654 nØD143
8
1A110
91011 nØD1512
A B nB C nC D nD
NA42 NkU
NA40 NkV
NA22
QF25QF26*C641
330360*
330360*
QF29C1063
68
68
0.047
100
QF32QF33*C1063
ØB
2.2K
1.5K
12
9
10
F408
8
7
J
K
Q
nQ
11
T
C
ØS0
Ø
ØS5
nØB
f5
NF5,6
NB5,6
NC5,6
ND5,6
NE5,6
NA9,10f8
ØB3NC20
NB19
NE22
NF19
NA24
12
9
10
C116
8
7
J
K
Q
nQ
11
T
C1
4
3
C116
5
6
J
K
Q
nQ
2
T
C
ØB
7
2C316
6543
6
789
C216
10
4 5C216
8
1C316
9101112
TC47
TC45
TC46
NC8 NB7nØB3
NB29
NE40
NKT
NB22
NC21
NE24
7
2E316
6
4ØD15
3NB21
NC22
NE20
7
2E315
654
ØD15•B3
3NB8
ND7
NE8
8
1E316
9101112
ØB3
ØD15
NF17
NKV
8
1E315
9101112
nØD0 ØD0NB43
NC26
NE31
NF32
ØB0NC16
NF14
NB15
ØB
ØB03
Sony SOBAX 2500 CalculatorSection: Timing (Bit & Digit)
Page: 5 Rendition: 2014 May 7
nØD15
nAnBnCnD
AnBnCnD
nAB
nCnD
AnBC
nD
nAB
nCD
nAnBC
nD
AnBnC
D
AB
nCnD
nABC
nD
AnBCD
AB
nCD
ABC
nD
ABCD
nABCD
nAnBCD
nAnBnC
D
ØB3 ØB3ØB312
T ØB 1 T 12 T 1 TØB ØBØBB105
J
K
Q
nQ
T
C
ØB 1
4
3
5
2
6
ØB3
10
4 5B308
TW
nØDINS to Q counter, DP counter and J counter
NB18
NA17NA36
NB37
DB1
?
f5
CA
3310V 15KCE
DP
0
1
×
3
4
5
6
7
8
9
Nk5
Nk6
Nk3
Nk8
Nk4
Nk9
Nk7
Nk1
Nk10
Nk2
n0
n1
n2
n3
n4
n5
n6
n7
n8
n9
n7n9
n1n3n5
Sony SOBAX 2500 CalculatorSection: KeyboardPage: 6 Rendition: 2014 May 7
NK2
Nk18
NkB
510
Ne41K1
8
1M6
9101211
12
3
1121
M2nQ
nPJ
nMnD
6
897
M1
4
10 M2
5
1M72
4
12
3
11
n8n9
n2n3n5
Ne39K2
7
2M6
6534
n7n8
n0n5n6
n8n9
n4n6n7
Ne37
8
1M8
12119
10
K4
n9
Ne35KW
10 of 510K10 of 0.068
+
–
2
÷
=
√
R
M
Min
Mout
NK11
NK10
NK16
NK15
NK6
NK12
NK7
NK8
NK17
NK14
nA
nS
nM
nD
nE
nQ
nR
nMS
nMI
nMO
nMC
nEnR
6
2M4
5473
Mc
S
D
J
NK4
NK3
NK9
NK13
nMC
nPS
nPD
nPJ
nPD
nAnS
nMS
8
1M4
12119
10
5
11
3
12
12M1
nRnMO
nAnD 4
10 M1
nMC
nSnMnMI
6
2M3
3475
nPS
nEnQ
nMS
11
1M3
98
1012
5
10
4 M5 5
11
3
1212
M5
6
987
M2
C6344.3K
0.22
nKFA
nKFB
nKFC
nKFD
<
Nk14
CS
Nk11
>
Nk15
9
6
1087
M7
nKDPNc38
Nb38
KSCSNb10
nKSRNb12
Nb14nKSL
6
987
M5Nd12
KCE
1K33
10V 15K
3310V 15K
1K
1K
LEARNAUTOMAN
CHECKOPER
READTOFF 33
10V 15KNk12
1K
ND27KTREAD
3
2M8
4567
NE38KTON
Nk13
NE28
510
0.068
3.9
NKS
NK18 Ne32
NF37
NA11
Nc34
nKCHECK
nKOPER
Nd31
NF41
Ne21
Ne30
nKLEARN
nKMAN
Nk17
NkS
Nk16nKAUTO
Ne6
Nd5nKMAO
Nd42
Nc41nKCA
u5/4d
Nb42nKRDWN to X register
NkA
NKUnKR54 to X register
NkP
NkR
Ne33
4
10 5D410Nd15 Ne16
nKSCS
Nd4
4
10 5D301 nKTREAD
107 69
8
E303nOVF
nKAUTO
CE20.068
10
4 5E401
nANEGnKSCS
nSH
NK5
DE2
nKPS to state registers
024
nØD0nØD2nØD4
KRØDNkE
Nb4
to F registerto N register
NK1
3.3K 120K
0.015
Backplane 1-539-225-11(Unit SN 620173)
Backplane 1-539-225-12(Unit SN 620175)
Sony SOBAX 2500 CalculatorSection: Control (part 1)
Page: 7 Rendition: 2014 May 7
9
10
D103
8
7
J
K
Q
nQ
11C4
3
D103
5
6
J
K
Q
nQ
2C9
10
D102
8
7
J
K
Q
nQ
11C4
3
D102
5 J
K
Q
nQ
2 C
6
3 TD6 TD1
TD2
TD4 TD3
FAnFAFBnFBF CnFCFDnFD
nKFD
122
111 D405
TBnSJTT
6
789
D202
3
1122
11D403
6987
D403
9
10
D106
8
7
J
K
Q
nQ
11C4
3
D106
5
6
J
K
Q
nQ
2C9
10
D105
8
7
J
K
Q
nQ
11C4
3
D105
5 J
K
Q
nQ
2 C
6
3
TD13
TD11
nGAGBGCnGD
2
111
12D406
TD12
RDY
nKCA
10
4D109 5nTT
SC
4
3
5
6
2D114
J
K
Q
nQ
CØD15•B3
TD40
ND31 NC30
YB
TT
7
6
8
910
D416VB
UCE
1
212
11D208 3
VC
1
2
12
11D216 3nSC
UCEUC
SD
TPT C
ND32 NB319
10
8
7
11D114
J
K
Q
nQ
C
12TØB 1T 12T1 TØB ØB ØB
12TØB 1T 12T1 TØB ØB ØB
1TØB
12TØB
ØD15•B3
6
TD38NC32
789
D3166
7
89 D212
UCE
nSA
SESC
5
11
D41634
121
2
JAQ
TT
678
9
D415510
4D415
nGD
12
1211
D316 3
WUCEQ
nOVFUE
SCTPUC
nKFC nKFB nKFA
Nd36 Nb34
Ne38
8
1C208
9101112
nSA SANC28 NB27
SA
nSA
3
2C405
4567
SB nSBNC34 NB33
NE34
nSB
SB
4
10 5E402nAISNEG
EP
4
10
5E408SK
nSM
Ne34 Nd33
FEto J counter
6
789
B311nUCSC ND26
NB25
Ne3
CA
1
3
21112
E408SJ
nSM
NPRESSAFD
1
3
21211
D202
FBnFC
TA
67
89 D302
F C
FB
nFB
11
3
1211
D401nFCnFD
nFA
nFB1
3211
12
D402F CFDTA
FA
1 32
1112
D204nFCnTX
nFB
nTK
8
6
79
10D101
nFBFA
F CNd40 Nc39
4
10 D401 5
4
10 D204 5 ND13
6
789
D204
4
10 D402 5
6
789
D402TT
KT
Nd38 Nc37
4
10 D202 5 Nd22 Nb22
Nd34 Nc33
UA
UB
UC
nUC
UD
UE
UF
6
879
E411nFDnTQ UG
Nd39Nd37Nd35
Ne42
Nd41
NE29
KCE1
3211
12
D211nSJnSBnSC
4
10 D411 5
3
2D207
4567
Nd11 Nc11
Ne12
RDY
5
4
10 D316Q
UCE
UCEQ
1
3
11122
C403nSJ
nKOPER
Nc42 Ne40SM
UH
6
879
E404nKCHECKSL
nAISNEG
Ne4 Nd3UJ
TD35
UJDD5
DD4
4
3
5
6
2D112
J
K
Q
nQ
CØD15•B3
5
4
10 D412
UCEQ
TD34
3
2D116
4567
Nd2 Nb2
Nc1
Ne2
UFSB 6
789
D412
212
111 D412
UD
WGC
3nTF
SE
Nd27 Ne289
10
8
7
11D112
J
K
Q
nQ
CØD15•B3
5
10
4 D408TD33
nSF12
1211
D408 3
5
4
10 D407nTJnKLEARN 67
98 D407
5
10
4 D216
UCE
T C
DISNEG
SK
4
3
5
6
2D113
J
K
Q
nQ
CØD15•B3
TD3712
11
12D415 3
ND37 NC38
NE42
YC
5
10
4 D406nTF TG
51
D41434
12
112
T CTV
VAUCE
TS
111
2
12
D110 3
W
UD
nFD1
3
211
12 D302
SA
F CnFB
9
10
8
7
11D113
J
K
Q
nQ
C
1 TØB
12 TØB
1 TØB
12 TØB
ND39 NC40
TD36
ØD15•B3
212
111 D209
UCE
VBJA
3TF
TM
8
1D116
9101112
ND41 NB41
NC42
7
6
8
910
D104nFC
FBFA
nFD
GBnGA
10
4 5B310
3
2C208
4567
nSE SENC36 NB35
NE36
10
4 5B311
TB26SE
nSE
SE
nSE
8
1C405
9101112
nSC SCNc2 Nb1
nSC
SC
SD
nSD
nSDSD
6
789
E413 nSF
nKMAN
SF
12
3
2
111 C414
DDISZnTD
YCNC15 ND16nJ
Sony SOBAX 2500 CalculatorSection: Control (part 2)
Page: 8 Rendition: 2014 May 7
4
10 D211 5Nd7 Nb8
6789
D211
TD39
Ne8
nSCnSDSE
4
10 D212 5Nd10 Nb11
Nc12
nSB
132
1112
D212
nSEnSD
SA
678
9
D216nSA
nSDnSC
ND44 NC43
NE41
1 3
2
11
12C408 10
4 C408 5
nSBnSA
nSESC
SE 1
3
21112
C411
6
7
89 C411
TC12
SBnSD
nSD6
7
89 C406
nSASB
6
987
C407
TC32
TA
T C
TG
nTG
nTC
TD
nTD
TE
nTE
TH
11
3122
1C404
SB
nSD
697
8
C408SD NC27 ND28
nSC
nSB
6
789
D410
TD20
nSC
TF
nTF
TB
NC37 ND38
DE19
SF 8
1C412
9101112
4
10C411 5SD
SB
NC29 ND30
TC27
TK
nTK
4
10 5E306nSJ
SM
1
3
21112
E401
TJ
4
10 D302 5
Nb18Ne18
Nd17
nTJ
5
2
D10434
12
111
nGD
W
6
789
D405
4
3
5
6
2D107
J
K
Q
nQ
CND20
NA18
NC19DISNEG
TD19
ØD15•B3
8
1D207
119
1012
TD18CHGSGN
4
10 D405 5T C
UCE
67
89 D408
nGAUD
4
10 D209 5TS
TF
1
3
21112
D413
SE
nTT
AISNEG
GB
Nd26 Nc259
10
8
7
11D107
J
K
Q
nQ
C
6
987
D208
ØD15•B3
Nd25 Nb372
3
11112
D205
TLTJ
Ne25
Nc23
6
798
D205
nTK
TN
4
10 D205 5
67
89 D115SC
DISNEG
X
TM
4
10 D208 5A
nTJ
678
9
D209V
UBnKMAO
TD14
nTF
nFC
7
68
9
10 D201FB
nFA
AISNEG
nAISNEG
Nd29 Nb309
10
8
7
11D108
J
K
Q
nQ
C
1 TØB
12 TØB
12 TØB
ØD15•B3
Nd28 Nb28
Nc27
6
978
D109UF
4
10 D110 5SE
JC
6
897
D110
2
3
12111
D109
TQF C
W
SC
SG
nSG
6
798
E401AISNEG nAISNEG
4
10 D403 5 ND42 NC41
10
4 C402 5
3 2C412
4
56
7
SEnSA
NC9 ND10
2
3111
12C409
6
987
C409
SE
nSB
SC
4
10 C409 5 Nc8 Nb7
nSD
1
3
21112
C4104
10 C214 5
6
789
C410SA TC17
SC
Nc19 Ne19
NC39 ND40
TT
nTT
TT
TW
nTV
TV
TU
1
3
122
11C407
SD Nc10 Nb9
NC35 ND36nSA
11
3
1212
C406
nSBSCSE 10
4 C407 5
TR
TQ
TS
nTR
10
4 5E404TA
1
311
122 E406
nSJnSK
6
789
E406
4
10 5E406
nTX
TXNe10 Nd9
Nb16 4
10 B404 5
nTK
TK
Sony SOBAX 2500 CalculatorSection: Control (part 3)
Page: 9 Rendition: 2014 May 7
67
89 D315nSE
SC
nTKTP
4
10 D214 5 ND29 NE30
6789
D214nSCnSEnTK
Nd8 Nc7
10
4 D315 5
SC1 32
1112
D315SE
nTK
SA ND8 NC7
ND12 NC11
nSB
1
3211
12D214
nSA
nSCSE
TQ
nTQ
TL
TM
TN
ANEGJ to SL register
nKAUTO10
4
3
E104
5 J
K
Q
nQ
2 C
6
SJ
nSJ
TE11
Nb24Ne20
ØD15•B3
12
3
1112
E206
6789
E206SK
7
6
1098
E403
9
10
E104
8 J
K
Q
nQ
11 C
7
ØD15•B3
1
3
112
12E205
6
789
E205SK
nSK
5
12
E403423
11
1
nKCHECK
Nc21
Nd19
nSM
UCESM
6
789
E305
V
10
4 5E205
9
10
E105
8 J
K
Q
nQ
11 C
7
ØD15•B3
SM
nSM
4 5E305
nSJ
TE13
11
3
12
12E305
1
3
12112
E306VB
6
798
E306
10
4 5E206nKMAN nTX
4
3
E103
5 J
K
Q
nQ
2 C
6
SL
nSL
TE8
ØD15•B3
DE3
6
789
E204
TE7
1
3
21112
E204
UCE
Nc17Ne15
nSFnSL
AISNEG
UCESF
ND9NE10
TE10
TE9
10
4 5B203nSJ
SJNF29Nb25
TJ
nTJ
NPRESSA
6
789
D301FAFD
nFC
1
3
2
1112 D301
nKTREAD
nTJ
Nd21 Ne22
Ne11 9
6
1087
E203nOVF
9
10
E103
8 J
K
Q
nQ
11 C
7
ØD15•B3
5
2E20311
4
312
1
UCEUH
nKSCS
nOVF13
2
1112
E304
67
89 E304
4
10
5E304nTC
nKAUTO
nKAUTO
nSMSK
SEnSCnSB
nSH
TE6
Ne31 Nb33SH to V register
UJ
33KQF22QF21*C634A10
25V
4.7K 10K1025V 4
10 5F309
1
3
21112
F309
NF43
2.7K
QF24QF23*C634A
150V
NF421.5K
nKLEARN
nKCHECK
NE43
2 D201
3
411
12
1nFBnFC
nFA
nTJnSF
nAISNEG
5
Nd14
Ne17
Sony SOBAX 2500 CalculatorSection: Control (part 4)
Page: 10 Rendition: 2014 May 7
1 TØB
12 TØB
12 TØB
1 T
12 TØB
ØB
Ne26
NF44
Nd1nKPS
nKTREAD
DD1
DD2
DD3
UB
nKSCS
4
10 5E204NPRESS
698
7
D406nTJFD
Nd23 Ne24ANEGJ
Sony SOBAX 2500 CalculatorSection: Q Counter & DP Counter
Page: 11 Rendition: 2014 May 7
9
10
B110
8
7
J
K
Q
nQ
11C4
3
B110
5
6
J
K
Q
nQ
2C9
10
B109
8
7
J
K
Q
nQ
11C4
3
B109
5 J
K
Q
nQ
2 C11
3
1212
nØB3
B2106
6
987
B210
4
10 5B210
4
10 B209
6
978
B209
5
6
798
B206
6
987
B208
4
10 5B307
ØD15•B3
698
7B306
SJ
TB29
TB28
TB24
TB30
nTXnØDINS
QA to V register
TB23
9
10
B108
8
7
J
K
Q
nQ
11C4
3
B108
5
6
J
K
Q
nQ
2C9
10
B107
8
7
J
K
Q
nQ
11C4
3
B107
5 J
K
Q
nQ
2 C
6
6
897
B307
4
10 B208 5
4
10 5B206
TB22
TB20
TB15
TB14
12TØB 1T 12T1 TØB ØB ØB
12TØB 1T 12T1 TØB ØB ØB
TB13
TB18
TB19
TB16
TB17
1
3
11122
B307
12
3
12
11B308
6
897
B308
nBCD
AnCnD
BnC
D
DnDCnCBnBAnA
A
nB
nC
D
nA
2
3
11121
B208
BCD
nØD15
11
321
12
B205
ØD15•B3
23
12111 B206
nØD1511
3121
2
B306
ØD0
KSCSSA
nKSL
nKSR
ØB3nØDINS
10
4 5B306nKSR
nUNITØD
UNITØD
DP to display
12
3
11
12 B209
nINITP
ND19NB20
nSESD
Q to SB register and UCEQ logic
ND33NB39CHGSGN to DISNEG register
DB7
DB6
DB5
DB4
DB9
DB10 RB21K
dimming for thousands separators by reducing duty cycle
9
10
B103
8
7
J
K
Q
nQ
11C4
3
B103
5
6
J
K
Q
nQ
2C9
10
B102
8
7
J
K
Q
nQ
11C4
3
B102
5 J
K
Q
nQ
2 C
6
6
798
B202
4
10 B101 5
10
4 5B301
TB7
TB9
TB4
TB312
TØB 1T 12T1 TØB ØB ØB
TB8
TB6 TB5
1
3
21211
B203
6
897
B203C
nD
BCD
DnDCBnBnA
B
11
3
1212
B101
nAnBC
J to N register and D data switch
D
TB1
4
10 B202 5
nSJ
nD 10
4 B302 54
10 B403 5
4
10 B402 5
FE
SJ
1
3122
11B202 6
879
B101ØB3
54
B201
11
2123
1
ØD15nSCnTG
YAØB0
nØDINS7
6
1089
B201
2
3
1
1112 B301
6
789
B301
11
321
12B302
6
798
B302
5
3
B40142
12
11
1
INTØD
nSBnSE
DDISZ
10
678
9B401
TJ
SEnSC
SGDDISZ
nSD
nSGnØD15
SA
nSCnTG
nW
6
789
B403SD
DDISZINTØD
TB2
nJ to SE register and B and D data switches
Nb19 Nc20
nJ
10
4 C110 5 nJ
689
7
C403Nc40
Nb39nKOPER
SMUH
Sony SOBAX 2500 CalculatorSection: J Counter
Page: 12 Rendition: 2014 May 7
RB11K
6
789
B405INTØDnKDP
nTC
10
4 B405 5
Nb15 Nc16
Ne13
1 32
1112
B404
TWSA
JA to SB and SD registersNb20 Nd20nDDISZ
JB to N register and D data switch
nSD6
97
8
B404Nb17 Nd18
SC JC to SG register and INTØD register
6
10
6
879
E212C
ØS13A
5
3E2101
12
11
2
4
9
6
78
10E210
B
ØS9
nC
ØS11
BnA
A
5
3E3101
4
12
11
2ØS10
nCnBA
5
11E3114
3
2
1
12
9
6
87
10E311
C
ØS14
C
ØS12
nBnA
B
51 E2094
23
11
12
SJ
ØS8
nCnBnA
52 E4071
411
3
12
SK
nCB
nA
9
10
E105
8
7
J
K
Q
nQ
11C4
3
E106
5 J
K
Q
nQ
2 C9
10
E106
8
7
J
K
Q
nQ
11 C4
3
E107
5 J
K
Q
nQ
2 C
62
312
111
E402
4
10 5E207
TE15
6
789
E207
2
3
11211
E207
nKMAOØD15•B3
V
ØB3nØD15
SJSM
1
3
21211
E307
4
10 5E307 6
798
E307
6
879
E308
TE17
TE16
6
789
E208
10
4 5E309
1
3
21112
E309
1
3
11122
E2084
10 5E208
TE18
4
3
E107
5
6
J
K
Q
nQ
2 C9
10
E108
8
7
J
K
Q
nQ
11 C4
3
E108
5 J
K
Q
nQ
2 C
6
AnA BnB CnC
TE19
TE20
TE21
TE22
687
9
E402
6
978
E309
10
4 5E414ØB3nKMAO
V
ØD15•B3SJSM
6
978
E414
AC
PA to E and EP data switches
NA12NE13P1ST to display
TE12
1 T 12 T 1 TØB ØB ØB
12T1 T12 T1 TØB ØB ØB ØB
7
6
89
10E209
B
A
nC
PEXP to displayNA14NE14
PØS to main registers
BnINITP
ProgramSlice Utilization Order:
First: ØS13 ØS11 ØS12 ØS14 ØS8
ØS10Last: ØS9
Sony SOBAX 2500 CalculatorSection: P Counter
Page: 13 Rendition: 2014 May 7
UG
POVF to OVF register
678
9
D411
5
10
4 D413
RDY
KTREAD ND11 NE12
nKCA
67
89 D401
nAISNEG
nTJUB
DE14
DE12
RE21K
2
4
10 5E202
9
10
E101
8
7
J
K
Q
nQ
11 C4
3
E101
5
6
J
K
Q
nQ
2 C9
10
E102
8
7
J
K
Q
nQ
11 C4
3
E102
5 J
K
Q
nQ
2 C
6
TE1
1
3
11122
E201
6
987
E201
10
4 5E201
KW
K4
K2
K1
6
789
E202
CE10.068
11
3
1212
E202
1
31112
E301
TE2 TE3
TE5
10
6
987
E302
10
4 5E301
6
789
E301
5
12
E3034
13
112
nSMnSK
JBUCEnSB
511 E3023
24
12
1
AISNEG
TE4
nOVF
SM
nTV
nSC
NPRESS to SH register
UJ
nKSCS
ØD0
12 T 1 T 12 T 1 TØB ØB ØB ØB
Nc32Ne29N to A, D and E data switches, M register and OVF register
nN to E data switch
Sony SOBAX 2500 CalculatorSection: N Register
Page: 14 Rendition: 2014 May 7
2
3
111
12C401
nSB
6
879
C402nTT
ACOMPnØD15
A
12
3
21
11C402
10
4 C401 5
TT
D
nTE
UCTW
TA
Nc35
Ne36
D
6
789
C401nTVØD0ØB0
1
32
11
12
B402
YA
nAISNEGJ
W Nb36 Ne27
nSH
EP
DE1
1
32
1211 E404
nKCHECKnAISNEG
NPRESSA to SB, SJ, SK, and SM registers
12124
11
nCD
B
32
114
12
nB
nD
A
111224
7109
C
BnD
nA
nD
4321
11
CD
nBnA
9
10
12T 1 T 12 T 1 TØB ØB ØB ØB
4
10 5E215 9
10
E115
8
7
J
K
Q
nQ
11 C4
3
E115
5
6
J
K
Q
nQ
2 C9
10
E116
8
7
J
K
Q
nQ
11 C4
3
E116
5 J
K
Q
nQ
2 C
6
nDD C nC B nB A nA
TE45
1
3
122
11
E215
6
798
E215
4
10 5E216
TE47
TE46
5E212
3ØS9
5E213
1
10
6
78 E213
B
ØS6
ØS4
nD
5E312
13
8
6E312
ØS7
ØS5
5E313
12
8
6
97 E313
nB
ØS10
ØS8
C10
4 5E4166E416
nA
B
C
D
nINITP
6
789
E216nTXØD15
10
1E314
111298
nDnCnB
nØD15nKCHECK
NA20NE16MEM1 to display
789
AnSJ
12 311
21
E216nSF
AISNEG
SLnTJ
SKN
TE43
Memory Slice Assignment:
Mem Slice1 ØS62 ØS73 ØS44 ØS55 ØS96 ØS107 ØS8
Sony SOBAX 2500 CalculatorSection: M Register
Page: 15 Rendition: 2014 May 7
M to X register
MØS to main registers
RE31K
DE17
DE16
DE15
DE18
0x11
x101
01xx
0x01
0x10
101x
1100
N4
13
212
11
C108
6987
C108
511
C107
342
12
1
8
6
79
10C109
4
10C108 5
5
4
C1093
1112
12
1
32
11
12
C207
7 6
89
10C209
5
11
C20912431
2
Nc14NF39 nDIN
ØB03
TM
SA
DUCE
JnAISNEG
OVF
nTE
X
nJnV
UCE
AISNEGØD0
WnSCnTG
UH
TETU
D
4
10 C106 5UH
4
10 C207 5
7
6
89
10C107
10
4 C415 513
212
11
C415nØD15DDISZ
nSC
ØB3
68
9
C110TK
7nSCJB
D
NC31 NF31BIN
1
3
122
11C213
6
987
C213
nTD
10
4 C213 5
12
3
21
11C214
6
789
C214
TK
nKCAB
nSC
TW
YTD
A
nØD15B
ØD15
NC25 NF30AIN
1
3212
11
C112
6
897
C112
X
10 C212 5
2
3
11211
C212
6
987
C212
A
nSCnKCA
nTD
TE
NnTE
TD
2
3
11211
C113
6
879
C113
Y
SC
nTV
4
10 C113 5
B
6
789
C404DDISZnSG
4
10 C404 5
nSA
nINTØD
TC34
AnØD15
4
10 C112 54
10 C406 5
6
789
C416
4
10 C416 5
6
987
C415
nAISNEG
A
6
987
C413
10
4 C413 54
10 C414 5
DISNEG
nD
6
7
89 C207
nSAnSBnSC TU
SE
SBnSC
N
ACOMP
DCOMP
SA
TD
TFTB
Sony SOBAX 2500 CalculatorSection: Main Register (A,B,C,D,E) Data Switches
Page: 16 Rendition: 2014 May 7
NF34CIN
12
3
1112
E413
12311
12
E414
12
3
11
12 E415
NE33
4
10 5E413
nSEnFD
ØS5X
ØS0C
KTON
nTQUG
nTQ
4
10 5E411
1
32
1112
E411
10
4 5E410
6
987
E410
698
7E409
1
312
112 E410
nFA
ØB3SF
nFAX
NF40NE39EIN
PA nN
nSF
1
3
2
1112 E409
SKSJ
4
10 5E409NF27Ne7
EIN_ENBUG
nJ
96
107
8
B406YA
5
11
B40631
212
4
UNITØDØB3
nSCnW
nTG
nTC
D
INTØD
RB31K
Nb13
231
1112
B405
DnINTØD
nJ
10
4 5E30812
1
3112
E308
RE11KE
nSKPA
RE41K
EP to N and F registers
SM
f2
f6
TF38
Sony SOBAX 2500 CalculatorSection: Main Registers (A,B,C,D,E)
Page: 17 Rendition: 2014 May 7
75
0.022C403A
8.2K
510
51K3K
510
C403A
3.3K
2.2K
116V
11K
8.2K
1016V
1016V
910
116V
390pF
7
8
9
ACOUSTIC DELAY LINE
1
2
4
3
5
red
green
QF27QF24*C641
820
5.6K6.2K*
30pF820
QF26QF27*C641
QF30QF31*C641
1.2K
560510*
560510*
5.6K6.2K*
30pF820
7.5K 82pF
QF21QF22*C641
4.7K4.3K*
1K
91pFØ
1
2.4K
QF2C403A
39K
30K
0.0022
68
1.5K 125V
2.4K
QF4C403A
20K
15K
0.0022
2.7K1.5K
0.0022
220
QF5C403A
100
220 0.0022
2703.3K
0.0022
4716V0.068
9
10
F405
8
7
J
K
Q
nQ
11 C
RDY
9
10
F404
8
7
J
K
Q
nQ
11 C
8
1F304
9101112
2
3
12111
F303
6
897
F3039
10
F302
8
7
J
K
Q
nQ
11 C4
3
F302
5
6
J
K
Q
nQ
2 C
9
10
F407
8
7
J
K
Q
nQ
11 C4
3
F407
5 J
K
Q
nQ
2 C
6
4
3
F404
5 J
K
Q
nQ
2 C
ØS1
f26
NF21
f21
f28
f7
f24
NF36Ø
f36
f34
6
A
f25
TF44
TF36
TF11
TF6
f42
f40
820820
5.6K
20pF 20pF
QF6C641
5.6K
4.7K
1K
4.7K
1KQF3C641
820
2.2K
1.5K
Ø
QF8C641
91pF
TF9TF10
91pF
9
F310
1011128
1
3122
11F410
6798
F410ØS1
4
10 5F410
1
3
2
1112
F411
678
9F411
ØS4
ØS5
11
3
21
12F412
6
879
F412
RDY
ØS2
10
4
5F412ØS3
f1
10
4 5F411nDIN
BIN
AIN
1K
EIN
nØB
9
10
F409
8
7
J
K
Q
nQ
11 C4
3
F409
5
6
J
K
Q
nQ
2 CEIN_ENB
f4
ØS14
PWROFFPfrom timing
NC17
ND18
NkD
CIN
ØD0
ØB0NE35
C
4
3
F405
5
6
J
K
Q
nQ
2 CØS2
f18
NF35D
Nb5
Nc6
9
10
F406
8
7
J
K
Q
nQ
11 CØS3
f16
NF33B
Nb6
Nc3
4
3
F406
5
6
J
K
Q
nQ
2 C
f23
NF38E
ND35
NE37
QF7C641
MSYNC to AFC in timing
4
10 C115 5 nD
B register
D registerdata being displayed,
unblanked 0’s mapped to 1000
A register
C register
E registers11 registers for memorys 1 to 7
and program instructions
4
3
F408
5
6
J
K
Q
nQ
2 C
12 T12 T
12 T 1 T
12 T 1 T
1 TØ
Ø Ø
Ø Ø
Ø
12 T 1 TØ Ø
1 TØ
12 TØ
1TØ
1 TØ
ØS2
ØS2ØB0
NF28NE2772E314
65
43
from P counter PØS
from M register MØS
9
10
F302
8
7
J
K
Q
nQ
4
3
F302
5
6
J
K
Q
nQ
Ø
f42
f40
12 1Ø
Substitute using 7400 series
T
T1
3
Sony SOBAX 2500 CalculatorSection: X Register
Page: 18 Rendition: 2014 May 7
5
4B312
1211
12
3
YA
nTRSA
nRNDØD
4
3
B114
5 J
K
Q
nQ6
9
10
B115
8 J
K
Q
nQ
C
7
9
10
B116
8 J
K
Q
nQ7
4
10 5B215 6
897
B213
6
879
B212
6
987
B214
4
10 5B2126
987
B215
1
3
21112
B216
1
3
11122
B213
4
10 5B214
TB38
TB40
TB42
TB41
TB45
TB46
nX4 X4nXW XW nX2 X2 nX1 X1
4
3
B115
5 J
K
Q
nQ6
TB43
TB44
11 3
1
2
12
B212
11 3
1
12
2
B214
4
3
B116
5 J
K
Q
nQ
2 C
6TB47
X4
nX4
1
3
21112
B215
10
4 5B216
6
789
B2165
11
B31332
1
4
12
nKRDWNnINTØD
nYR54
1
31112
2B310
ØD15
9
10
B114
8 J
K
Q
nQ7
2 C1111 C
2 C
11 C
TB324
10 5B113
6
879
B113
689
7
B112
12
3
12
11B113
4
10 5B112
789
10B313
10
4 5B211
6
987
B211X1
XW
nX1
6
121121
B112
1112
2
1B211 3
6
987
B111nX2
1211
12
B111 3
10
4 5B111X2
X1
nX1
ØB0
NC18NB17
ND17
NE18
NC10NB9
TB34
ØB0
ØB0
NC24NB23
INA
6
9
87 C414ØB0
NC14
NB13
ØD0
TH
nTG
INB
X to AISNEG register and A, C, D and E data switches
XOVF to OVF register
CA to SB register and Y register
nCA to Y register
1 TØB12ØB12 TØB
1 TØB
ØB
12 TØB
Nc13nKR54
NB14
X
nX
X
nX
nX X
nB4
nB4
B4
B4B4
nB4
nB4
B4
7
6
89
10C215
5
11C215
124
3
12
nSB
A
SC
1
3
21211
C114
TTnTK
NC12
NB11
ACOMP
nØD15
6
879
C115nTE
SD
nSA
TE
TR
nSC
ØB0
TN
ØD0
6
978
C114
12
3
12
11C115
SE
WA
2
3
11211
C216nW
B
4
10 C114 5UA
9610
78
B312
B
nTRSA
nRNDØDINB
ND34NC33
2 D1014
113
121E
nFB
nTK
nFA
F C5
NE32
4
10 5E415
6
7
98 E415
C
KTREAD
nTQUG
3
nD
8
67
109 C211
5
11
C2111
412
2
ØD15
nSEnTK
SA
7
689
10
C210
54 C21012
113
1
2
VA
nTG
Y
DDISZ
23
112
11
C11167
89 C111
10
4 C111 5
D
nSD
TH
UA
2
3112
11C110
SE
UFnSC
ØD15
ØD15
nSA
SCnSB
4
10 C410 5TU
DCOMP
7
6
8109
E310
nKCHECK
M
Nb3
Ne1
nTXØD15
Nc4
INA
DCOMP
nSE
Y
TC9
Sony SOBAX 2500 CalculatorSection: Y Register
Page: 19 Rendition: 2014 May 7
9
10
C103
8
7
J
K
Q
nQ
11
C
4
3
C101
5
6
J
K
Q
nQ
2CC102
J
K
Q
nQ
C4
3
C102
5 J
K
Q
nQ
2 C
6
TC7
TC6
TC2
6
987
C106nCnBnA
AnABCnC1
3
122
11C202
CA
TC5
9 68
710
C205
6
987
C201
CA
52 C2053
1112
4
1
ØD15
SASB
ØB0TH
7
6
9
810 C206
6
798
C105
12
3
1112
C105
6
879
C104
5
2
C20634
11
12
1
NC13 ND14
TC4
nB
2
3
12111
C204
4
10 C203 5
TC10
4
3
5
6
2
1
3
122
11
C203
9
10
8
7
11C101
J
K
Q
nQ
C12
TØB
1T T1 TØB ØB ØB
1
12 TØB
nYR54 to X register
1
3
21211
C201CB
ØB0
10
4 C201 5
6
789
C204nSBnSCnSD
nSE
nØD15
nØD15
nØD15
ØD15
TM
TN
nTT
DCOMP
10
4 C105 5nTD
1
3
21211
C104
B
B
nSB
TWTT
1
3
11122
C106
TC14
SA
6
897
C202TH
Nc26
YB to SA registerND25
nKDP
TC1
SC
TC3
4
10 C104 5
B
nTD
ACOMP
Y to B data switch, X register and OVF latch
Nc36 Nb35YA to J counter, N register, D data switch and X register
YC to SE register
6
987
E408SJ
nSM
NE26
nDDISZ
1
32
1112
B311nSB
nSESC
NB24nCA
Sony SOBAX 2500 CalculatorSection: Misc. Registers
Page: 20 Rendition: 2014 May 7
Nb27 Nc28
4
3
5
6
2B104
J
K
Q
nQ
C
4
10 B205 5
1
3
122
11B403
ØB3
ØD15•B3
6
789
B402nSCUNITØD
nSD
6
879
B205SDSC
10
4 B305 5KRØD
INTØD to J counter and display
nINTØD to B and D data switches and X register
TB10
1
3211
12B305
SEnSD
SG
UNITØD
9
10
8
7
11B105
J
K
Q
nQ
C12 TØB
678
9
B305SC
nSC
ØB3
D
nØB3
DB2
DB3
nSESD
Nb29 Nc30
1
32
1211
B304
6789
B304
5
2B303
124
3
111
ØB3
nUC
nSD
SHØD15•B3
ØD15•B3SC
4
10 B304 5
6
789
B204QA
2
3
11211
B204
nSCSE
9
10
8
7
11B104
J
K
Q
nQ
C
10
4 B204 5
nUNITØD
KRØD
nSB
7
698
10B303
ØB3
SB
Nb26
Ne23
Nd24
Nb23 Nc24
nINITP
V to SJ, SK, SM and AISNEG registers and P counter
nV to D data switch
nSD
nSDSB
nTX
nRNDØD to X register
Nd32 Nb314
3
5
6
2D108
J
K
Q
nQ
CnKSCS
Nd30 Nb32
Nc29
5nTFSG
678
9D111
2
12111 D111
SASD
GB
Nc31
4
10 D111
3UE
T C
TM
W to SB, SC, SE, SG, DISNEG registers, N register, X register and D data switch
nW to J counter and X register
1
3212
11
C413
nTK
ØB0ØD15
1
3
21211
C416ØD15
nDDISZ
Y
nVC
XOVF 10
4 C204 59
10
8
7
11C103
J
K
Q
nQ
C
1 TØB
12 TØB
1 TØB
12 TØB
6
789
C203UCE
TC11
TC8NC44
ND43
NA32nOVF to SB and SH registers, N counter and display
OVF to D data switch
NE44
nUC
2
31
1112 D407
TM
DISNEG
UC1
3
21112 D411
nGD
AnVC
Nd6
Ne9Nc5
10
6
9
87 E407
ØD15nTC
N
POVF
nDDISZ to J counter
DDISZ to SE register, J counter, B and D data switches and X register
Nb21 Nc22
1
3
21211
D410
KSCSNd13 Ne14
4
10 D115 5 Nd16 Nc15
nSB
1
32
1112 D115
SE
SA
7
689
10D414
UC
ND24 NC23nSDnSB
VA to SE register and X register
VB to SA, SD and SJ registers
VC to SA register
nVC to OVF register
V
JC
2SC926
DIGIT 1 (LSD)
Sony SOBAX 2500 CalculatorSection: Display
Page: 21 Rendition: 2014 May 7
0
1
2
3
4
5
6
7
8
9
.
C926
100K
3.9K
51K
— (negative)
DIGITS 2 to 15
12 of C92612 of
3.9K
10 of 75K
4.3K?W
DP
1M
C9263.9K
51K
Pexp
PEXP
1M
C9263.9K
51K
OVERFLOW1M
6
798
A111nOVF
J1M
DISNEG
Digit Fct Lamp1 J2 mult3 ÷4 +5 R6 √7 –8 Mout9 =10 D11 Mc12 M13 Min14 S
2SC926510
ØD02K 1M
2750K
33K
1160V
3750K
33K
1160V
4750K
33K
1160V
5750K
33K
1160V
6750K
33K
1160V
7750K
33K
1160V
12K1W
V+130
27K1W
300K
RDY
P1stC634
510
1
B1361K
MEM1
P1ST
4
10 5B413
1
3
12112
B413
nW
12
4
10 5B411
NA43
1
3
12112
B410
6
798
B410124 6
897
B310NB44
4
n12
10
4 5A111
NA38NB42
NA37NB38
6
789
B4111
4n2
4
10 5B410NA39NB40
1
3
11122
B411
W4
n2n1
4
10 5B412
1
3
112
12B412
n4W
2NA35NB36
67
89 B413
nW
4
6
789
B412
NA31NB32
NA33NB34
4
10 5B414
1
3
21112
B414n1
nW2 NA29NB30
6
879
B414n2nW
110
4 5B415NA27NB28
6
897
B415W
n1 6
879
B416n4
NA25NB26
nØD0
10
4 5B416NA16NB163B415
n4
1
W
n2
2
3
11121
B416
n1
n4n2
nW
1
4
3
B314
5 J
K
Q
nQ
2 C
T6
2
n2
12
9
10
B314
8 J
K
Q
nQ
11 C
T7
1
n1
1
4
3
B315
5 J
K
Q
nQ
2 C
T6
ØB
ØB3
W
nW
12
9
10
B315
8 J
K
Q
nQ
11 C
T7
4
n4
XW
nXW
X4
nX4
X2
nX2
X1
nX1
nTX
1212
11
ØB
ØB3
ØB
ØB3
ØB
ØB3
NA15
NB12
nKCHECK
INTØD
ØD12.2K
DB8
HitachiCD81
V+130 V+130 V+130
V+200
V+130
V+200
V+130
red
Sony SOBAX 2500 CalculatorSection: Power Supply & Unused Gates
Page: 22 Rendition: 2014 May 7
117VAC32W
POWERorange
white
2200016V
F10.8 A
blue
blue
F23.15 A
2SD28
2SD88A
10450V
200VAC
10K?W
8VAC
red
C867
C634
1350V 1.5K
200K
6.2K
150K
VR22K
200K
C634C634
0.047
47K?W
C756
51K?W
3K1W
24K
5150V
2K
7.5K
VR11K
C634
10025V
10016V
2K 2206.3V 0.15
LA
+4V
100025V
brown
F30.35 A 2SD28
15VAC
4.3K 1016V
V–101016V
2K
brown
0.0022
150V
2.4K
NA1
NA2
NA7,8
NA3,4
NF9
NA5,6
NB1,2,b43
NF1,2,11,13
4710V
NB3,4,b43
4710V
4710V
4710V
NE3,4,e43
4710V
NF3,4,7
3 of 4716V
POWER
0.068
4716V 0.068
0.068
NKP,R
NKA,B,C
NC3,4,c43
ND3,4,d43
NC1,2,c43
ND1,2,d43
NE1,2,e43
12
1112
E416 3
4
10 B213 5
UNUSED GATES
4
10 C202 5C103-4
4
10 C403 5
6
789
D413
allICs
13
14
V+200
501
(625KHz) Ø
Timing Signals IC Pinouts
ØS0
0µS 8
ØD-C
ØD-B
ØD-D
100 200 300 400 500 6400µS 1400130012001100780 820 960 1000 1500 0
(39KHz) ØB
100
1 2 5 10 4 9 3 6 13 11 7 15 14 12 8 0ØD-A
ØB
ØB3
ØS1
Sony SOBAX 2500 CalculatorSection: Timing Diagram, Bit Codes & IC Pinouts
Page: 23 Rendition: 2014 May 7
502
503
504
+4VGND
+4VGND
0
(610 Hz) ØD0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 015 0
ØD-AK
1.6 3.2 4.8 6.4 9.6 11.2 12.8 14.4 16.0 17.6 19.2 20.8 22.4 24 25.6
ØS2
ØS3
ØS14
ØS15+4VGND
(9.8KHz) ØB0 0 1 2 3
+4VGND
nQa
Qa
Ka
Ja
TaCa
Ja KaQanQaCaTa
Jb
Kb
QbnQbCbTb
nQb
Qb
Kb
Jb
TbCb
ØB03
ØD-AJ
UNITØDwith 4 decimal places
INTØDwith 4 decimal places
14 13 12 11 10 9 8
1 2 3 4 5 6 7
14 13 12 11 10 9 8
1 2 3 4 5 6 7
14 13 12 11 10 9 8
1 2 3 4 5 6 7
14 13 12 11 10 9 8
1 2 3 4 5 6 7
IC technology inferred to be DTL inputs with open-collector outputs.
Inferred for 504 flip-flops: C = Capture Input T = Toggle (Clock) InputThe J/K state is captured when C is HIGH and T is LOW. Q and Q are set in accordance with the captured state when T goes HIGH.
Numera l W421blank 0000
0 10001 00012 00103 00114 01005 10116 11007 11018 11109 1111
function 1001
Bit Codes
Note: The W bit has a weight (value) of 2.
Funct ion D C B A+ 1110– 0110× 0111÷ 1111= 1001√ 1011R 1101M 1010
M IN 0100M OUT 1100M CLR 0101
S 1000D 0010J 0011
null 0000
Note: Frequencies shown are approximate, may vary with unit and temperature.
b c d eGND 44 43 V+4 V+4 44 43 GND GND 44 43 V+4 V+4 44 43 GND
nKRDWN 42 41 – UH 42 41 nKCA nKCA 42 41 nKFA nKFA 42 41 K1– 40 39 c40 b39 40 39 UA UA 40 39 nKFB UH 40 39 K2
nKDP 38 37 nAISNEG nKDP 38 37 UF UF 38 37 nKFC FE 38 37 K4e27 36 35 Y A YA 36 35 e36 FE 36 35 nKFD c35 36 35 K WFE 34 33 SH nKOPER 34 33 UC UC 34 33 e34 d33 34 33 keyboard
nW 32 31 W N 32 31 W W 32 31 nKLEARN nKCHECK 32 31 SHSG 30 29 DDISZ DDISZ 30 29 nW nW 30 29 SG nKMAN 30 29 N
nSG 28 27 nDDISZ nDDISZ 28 27 nSG nSG 28 27 SF SF 28 27 b36V 26 25 SJ YB 26 25 AISNEG AISNEG 26 25 nAISNEG F44 26 25 AISNEG
nSJ 24 23 nV nV 24 23 nAISNEG V 24 23 e24 d23 24 23 VnUC 22 21 nINTØD nINTØD 22 21 nSJ nUC 22 21 e22 d21 22 21 nKAUTO
JA 20 19 nJ nJ 20 19 nTV JA 20 19 nSJ nSJ 20 19 nTVTJ 18 17 JC – 18 17 S M JC 18 17 TJ TJ 18 17 d14
nTX 16 15 JB JB 16 15 nVC nVC 16 15 nKSCS nKSCS 16 15 S MnKSL 14 13 nD nD 14 13 nYR54 e17 14 13 VB V B 14 13 JBnKSR 12 11 nTG nTG 12 11 UCE KCE 12 11 UCE UCE 12 11 F42
KSCS 10 9 nTR nTR 10 9 – nTG 10 9 nTX nTX 10 9 d6, c5nTC 8 7 TW TW 8 7 TQ TQ 8 7 nTC nTC 8 7 EIN_ENB
MBR 6 5 MDR D 6 5 e9 e9 6 5 nKMAO nKMAO 6 5 –KRØD 4 3 X INA X INA 4 3 B KSCS 4 3 UJ UJ 4 3 D26
nSC 2 1 S C S C 2 1 nSC nSC 2 1 F44 nSC 2 1 X INAA B C D E F
nØD0 44 43 9 9 44 43 ØD0 nOVF 44 43 TA TA 44 43 nOVF nOVF 44 43 F43 d1, e26 44 43 E43nØD2 42 41 – n8 42 41 nSD nSD 42 41 nTT nTT 42 41 nSD nSE 42 41 TA e11 42 41 nKLEARNnØD4 40 39 7 7 40 39 CHGSGN SD 40 39 TU TU 40 39 SD nØD0 40 39 EIN EIN 40 39 nDIN
n8 38 37 6 6 38 37 nØD11 nSE 38 37 TF TF 38 37 nSE KTON 38 37 E E 38 37 nKCHECKnØD11 36 35 5 5 36 35 SE S E 36 35 TS TS 36 35 E SE 36 35 C C 36 35 D
– 34 33 4 4 34 33 nSB nSB 34 33 E32 E32 34 33 CHGSGN nSB 34 33 CIN CIN 34 33 BnOVF 32 31 3 3 32 31 S B S B 32 31 BIN SB 32 31 nSA C33, D34 32 31 ØD0 ØD0 32 31 BIN
– 30 29 2 2 30 29 nØD0 nSA 30 29 nTK nTK 30 29 nTQ nTQ 30 29 nKFD AIN 30 29 SJ– 28 27 1 1 28 27 S A SA 28 27 TB TB 28 27 KTREAD KTREAD 28 27 E ØS E ØS 28 27 EIN_ENB– 26 25 0 0 26 25 D26 ØD0 26 25 AIN e3, B25 26 25 Y B YB 26 25 F26 E25 26 25 pwr off
ØB3 24 23 – YB 24 23 CA C A 24 23 V A VA 24 23 – nØD15 24 23 ØS5 ØS5 24 23 pwr offnØD15 22 21 – nØD15 22 21 ØD15 ØD15 22 21 nØD15 – 22 21 RDY ØB3 22 21 ØS10 ØS10 22 21 AMEM1 20 19 – Q 20 19 ØB3 ØB3 20 19 DISNEG DISNEG 20 19 Q ØD15 20 19 ØS14 ØS14 20 19 ØB3
DISNEG 18 17 nØDINS nØDINS 18 17 X X 18 17 A MAR 18 17 X X 18 17 ØS0 ØS0 18 17 ØD15•B3funct ind. 16 15 DP funct ind. 16 15 ØB0 ØB0 16 15 D16 C15 16 15 – MEM1 16 15 ØS4 RDY 16 15 ØS4
PEXP 14 13 RDY nYR54 14 13 C14 B13 14 13 YC Y C 14 13 – (UE) PEXP 14 13 P1ST ØB0 14 13 GNDP1ST 12 11 nKCHECK DP 12 11 X INB X INB 12 11 TN TN 12 11 E12 D11 12 11 nINITP nINITP 12 11 GND
ØB 10 9 ØB nINITP 10 9 XOVF XOVF 10 9 TT TT 10 9 SK SK 10 9 Ø Ø 10 9 V–10V+4 8 7 V+4 ØD15•B3 8 7 nØB3 nØB3 8 7 TM T M 8 7 ØD15•B3 ØD15•B3 8 7 Ø Ø 8 7 V+4
GND 6 5 GND ØB 6 5 ØB ØB 6 5 ØB ØB 6 5 ØB ØB 6 5 ØB ØB 6 5 ØBV+8 unreg 4 3 V+8 unreg V+4 4 3 V+4 V+4 4 3 V+4 V+4 4 3 V+4 V+4 4 3 V+4 V+4 4 3 V+4
V+200 2 1 V+130 GND 2 1 GND GND 2 1 GND GND 2 1 GND GND 2 1 GND GND 2 1 GND
SonySOBAX 2500 Calculator
Section: Connectors Page: 24 Rendition: 2014 May 7Notes:• Italicised expressions are connections with no signal name in the schematic.
• Bold-faced expressions are signal sources.