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DOS and 4 GB of memory (Users)

posted by Steve Homepage E-mail, US, 31.07.2008, 13:00

> I realize the whole 4 GB address space cannot be directly used in DOS in
> 32-bit systems because of virtual mapping, etc. The most I've been able to
> get HIMEM.SYS ver. 3.0 to see is 3328 MB. This is with an old 128-MB ATI
> Radeon 9200 card. Am I correct in assuming that reducing the total video
> memory will augment the total available DOS RAM?
Precisely because the video card has its own RAM, you can tell DOS memory managers to free up the system RAM that DOS normally reserves for video. But you still won't get the whole 4GB, or whatever the amount of system RAM is, because some will still be reserved for system or DOS use.

> So using an old 4 MB or 8 MB card would give me more addressable memory?
If your system recognizes it, and if you have the drivers for it.

> Can 16-bit apps be tweaked to see > 2 GB. Specifically, I'm wanting to
> create a RAMDISK over 2 GB in FAT16, utilizing 64-kb clustersize.
DOS and apps see a RAM disk as a disk, not RAM. Apps don't care about disk size (unless they run out of it when writing new files).

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