Re: increase base memory

[Stas Sergeev <stssppnn@yahoo.com>]

Hello.

Sergey Suleymanov wrote:
> Stas> Increasing the base memory above 640Kb is definitely the bad
> Stas> idea, as it is used very rarely even in a pure DOS and will
> Stas> cost you the inability to display graphics.
> By the way, 0.99.13 (pre-1.0) works well with 704k base. ;)
How "well" did it work? Working without
graphics is definitely not "well" and I
bet some graphics modes should be broken
(if not all). Furthermore the programs
expect the video mem to be where it must
be, so in that case it will just write
to its own memory (corrupting it) trying
to write to a video memory.
This must be rather safe for the text
modes however, so as the text buffer
starts at 0xb000 IIRC.
There is a bug in a parser: it calls
stop_video() for some reasons and it
changes the base mem to 640 when started
under console. This must be resolved
somehow, I guess Bart knows what's
going on there.
But if it would be me, I'd just disallow
more than 640Kb by erroring and terminating
dosemu right away.
I haven't got an answer yet, why is this
really necessary? Are you always using a
"vidram" under real dos? I guess you are
not, but then why should that be used under
dosemu? That's weird and unsafe, why anyone
should be willing to do this? You can use
UMB and HMA, is it not enough?
Well, if that is just a comparison with
0.99.13, then you are right, there is a bug
in a parser.y.in now which must be fixed,
but that still doesn't mean that >640 should
be used on a regular basis after this is fixed.