On Mon, 16 Dec 2002, John Elliott wrote:

>   Well, at least since the EGA. I suppose if DOSEMU emulated an MDA or a
> CGA, then it would make sense to use the memory up to B000:0 or B800:0
> respectively. On an original XT, it was even possible to do this in
> hardware:
> <ftp://ftp.simtel.net/pub/simtelnet/msdos/info/896k-mem.txt>

right, and this is also true if you run console DOSEMU and lie to it that
you use a CGA graphics card, ie. $_video = "cga", and remove that 640k
check in the parser. Caveat emptor -- your video BIOS might NOT like
this, weird things my happen, and I haven't tried it.

as for xdosemu: it uses vgaemu and I don't think that can be switched off
easily. vgaemu pretty much assumes that it can r/w protect all pages from
0xa000:0 up to 0xc000:0.

Now if you run dosemu in terminal mode you could go up to 736k (b800), and
if you run dosemu in "dumb" mode, well, f000 is even possible, ie., 960k,
if you disable EMS too.

Bart

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