maximum amount of memory for DOS

January 9, 2011 at 11:32:13
Specs: DOS 6.22, P4 2Ghz/1536GB
What is the maximum amount of memory that DOS 6.22 can support? Every time that I boot the computer it just sits and does nothing. It was running fine with the original 640 MB of RAM then I upgraded the thing to 1.5 GB of RAM and now it doesn't seem to work. The only reason I'm running the computer with DOS is because of some really old software that gets used on it, that I can't replace.

See More: maximum amount of memory for DOS

Report •

#1
January 9, 2011 at 14:00:49
DOS 6.22 can address 640 KB (not MBytes!) of conventional memory and use upto 64 MB of extended memory via DPMI and DOS Extender or himem.sys.

I strongly suggest you download a free virtual machine as MS Virtual PC or Open Source VirtualBox then install as guest operating system your MS DOS 6.22 and run the legacy applications inside the virtual environment. In that way the DOS applications run concurrently with a modern Windows system as XP/Vista or 7 inside a window on the desktop.

Using MS Virtual PC you can even set up an easy sharing of files/folders with the host hard drive.


Report •

#2
January 9, 2011 at 19:47:55
If you did actually have 640 meg of ram originally, dos was ignoring most of that. If adding more is the reason it's having problems then it's a hardware issue. Maybe dos is trying to use resources now being used by the additional ram.

You can check in cmos/bios setup for a 'PnP OS' option. If it's there try setting it to NO. And I assume you've got config.sys and autoexec.bat set up correctly with himem.sys and emm386.exe to manage ram above 640 K. Or run in a VM, as already suggested, or drop the ram to what was previously workable.

Real men don't use AntiVirus; they just reformat


Report •

#3
January 9, 2011 at 20:31:32
"The only reason I'm running the computer with DOS is because of some really old software that gets used on it, that I can't replace."

If you're trying to run DOS-only programs under Windows, DOSBox (or some other VM) may work for you:

http://www.dosbox.com

"Channeling the spirit of jboy..."


Report •
Related Solutions


Ask Question