Back to home page

DOS ain't dead

Forum index page

Log in | Register

Search:  
Back to the forum
Board view  Mix view

DOS and 4 GB of memory (Users)

posted by Rugxulo Homepage, Usono, 06.08.2008, 01:11

> > I'm using CWSDPMI r6 many years and I didn't find any compatability
> > problems and I can see all 2GB of physical RAM.
>
> It's not VCPI compliant. I had to implement a hack in Jemm to make CWSDPMI
> run with it.
In particular, I think r6 w/ (sometimes?) 4 MB pages will always have issues with some VCPI/EMM386s. CWS never did have enough testers of various VCPI servers, so if anyone here wants to test on QEMM, 386Max, whatever ... feel free to report your experiences either here or to CWS directly. Just anything that doesn't work as normal in standard/stable r5 is what he's specifically curious about (esp. DJGPP apps with code + data >= 4 MB: uncompressed CC1PLUS.EXE from GCC, Dungeon Crawl:SS, unstripped GDB, whatever).

http://rugxulo.googlepages.com/csdpmi6t.zip (44k)

( cwsdpmi AUGHT earthlink DAWT net )

Anyways, here's what Eric Auer had to say about 4 GB in pure DOS:

> About the 3.3 GB limit, this is simply because the BIOS tells HIMEM / ...
> that the last 0.5 or more GB of the 4 GB address space are
> reserved for PCI / AGP / PCIe MMIO and framebuffers,
> ACPI and BIOS data and similar stuff. No DOS bug here.
 >
> This is NOT related to possible 2 GB and similar limits in
> DOS extenders. As a rule of thumb, if anybody can use more
> than 3 but less than 4 GB, the DOS extender WILL give him
> the full 4 GB, but there are hardware / firmware reserved
> areas which prevent you from using them.
I would test a bit myself, but I don't have that much RAM (although some uber-geeks seem to ... it shan't be long before we are all assimilated).

Post reply
 

Complete thread:

Back to the forum
Board view  Mix view
22752 Postings in 2119 Threads, 402 registered users (0 online)
DOS ain't dead | Admin contact
RSS Feed
powered by my little forum