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Home | Guides
Help GuidesRunning Old MS-DOS GamesInsufficient Memory
Errors
Situation: You're trying to run an older game that was written
for the MS-DOS opera ting system,but you receive an "insufficient
memory" error message like this:
Not enough memory -- At lea st 590K of memory is needed.
This is caused by the limitations of MS-DOS. DOS can only handle
an upper limit o f 640K of memory (RAM). However, some of that
memory space is taken up by DOS itself. Windowssystems that support
DOS default to loading it into "upper" RAM, which gives your DOS
programsabout 590K to work with. However, certain system elements,
like CD-ROM drivers, may take upmore memory, which may cause
certain DOS games to be unable to execute.
What is DOS, anyway?
What to Do:
To run games that give you this error, you will have to tell
Windows to execute them differently.
Locate the executable file that starts the game. Such a file
typically ends with an extensionof .EXE .
How do I check filename extensions?
1.
Click on this file with the RIGHT mouse button.2.
Select Properties from the callout menu that appears.3.
Click the Program tab, then the Advanced... button.4.
Check the box next to MS-DOS Mode . This will enable the prog
ram to use the customizedstart-up configurations that are in the
text boxes you see. They should look like this:
CONFIG.SYS
Box:DOS=HIGH,UMBDevice=C:\WINDOWS\Himem.SysDeviceHigh=C:\WINDOWS\EMM386.Exe
AUTOEXEC.BAT Box:SET TMP=c:\windows\TEMPSET
TEMP=C:\windows\TEMPSET PROMPT=$p$gSET winbootdir=C:\WINDOWSSET
PATH=C:\WINDOWS;c:\windows;c:\windows\COMMANDSET
CTSYN=C:\WINDOWSSET BLASTER=A220 I7 D1 H5 P330 T6
5.
Click the OK button three times to imp lement the changes.6.
The next time you double-click the executable game file, Windows
will temporar ily shutdown and reboot into the custom DOS mode you
specified. NOTE: You should shut down
all other Windows programs before doing this! Since you will be
telling your PC torun in a "non-standard" manner, there is always
the possibility your system will hang or beunable to return to
Windows. Shutting down other programs decreases the likelihood of
asystem conflict, and ensures you won't lose any work .
7.
With that in mind, double-click the game file. It should run,
but you will have to wait aminute or two while your system
reconfigures itself.
8.
To get back to Windows, simply exit the game when you are
finished ("Quit to DOS" if itasks you). Windows should detect that
your game session has terminated and r estartitself.
9.
This troubleshooting guide is based on the help resources found
at Oldskool.org . We'd like tothank the authors of that site for
all of their efforts.
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