kadie@herodotus.cs.uiuc.edu (Carl M. Kadie) (07/17/90)
Has anyone had problems with QEMM and a 1024x768 VGA card? When I try to draw a test picture, the machine freezes. The VGA card is a 512k Trident clone. It works fine until I go into the 1024x768 mode. The first line of my config.sys was: DEVICE=C:\QEMM\QEMM.SYS ram rom But the problem also appears with this line: DEVICE=C:\QEMM\QEMM.SYS If you have QEMM 5.0 and a Trident 512k VGA card, have you tried 1024x768 mode? How is your config.sys setup? Carl Kadie --- kadie@cs.uiuc.edu University of Illinois at Urbana-Champaign === Today the NEA and alt.sex, tomorrow our public libraries ===
KRW1@Lehigh (07/18/90)
Carl, Sounds like QEMM isn't identifying all of your video ram, and including some of it in its mappable address space. You'll have to "exclude" it on the QEMM line. The trick is finding it. Manifest will give you a clue as to where it starts, but you may have to contact the manufacturer for the actual address range. One thing you can try is the analysis procedure outlined in the manual. Look at the addresses on the Manifest analysis screen just above the video address range it specifies on the devices screen. Then run a graphics application and see if any more has been used. It's a bit tedious, so you might just want to ask tech support for the video board. -- Kevin
kadie@herodotus.cs.uiuc.edu (Carl M. Kadie) (07/18/90)
With the suggestions I received, I was able to get it working.
The problem was interference between QEMM and video memory.
To make matters worse, the interference caused the machine to freeze up.
The solution was to load Qemm like this:
DEVICE=C:\QEMM\QEMM.SYS on x=a000-ffff
Then I exercised all the video modes of the card. I switched
to 132x60 text mode, Hercules mode, and the high-res color
modes (using the 'chkmode' program and 'fractint'). Then
I ran desqview and other programs. [See "Analysis Procedures"
in the Qemm manual for information on this.]
Then I typed
qemm analysis
Receiving a report like:
Area Size Status
0000 - C7FF 800K OK
C800 - EFFF 160K Include
F000 - F0FF 4K OK
F100 - F7FF 28K Include
F800 - FAFF 12K OK
FB00 - FBFF 4K Include
FC00 - FCFF 4K OK
FD00 - FDFF 4K Include
FE00 - FFFF 8K OK
Finally, I modified the qemm load line:
DEVICE=C:\QEMM\QEMM.SYS ram rom x=a000-ffff i=c800-efff i=f100-f7ff i=fb00-fbff i=fd00-fdff
Thanks to everyone who helped,
--
Carl Kadie --- kadie@cs.uiuc.edu
University of Illinois at Urbana-Champaign
=== Today the NEA and alt.sex, tomorrow our public libraries ===