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BUGS
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Text File
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1993-09-24
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2KB
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44 lines
Log of BUGS and programs with the Universal VESA VBE
----------------------------------------------------
This file documents known problems with the Universal VESA VBE. I have done
my best to try to fix all know problems, but some still persist and may
well be limitations in the particular video controller hardware and
may not be fixable.
Cirrus CL-GD542x chipsets:
- The Cirrus 5422 chipsets will not allow access to > 256k of
memory in 320x200x256 color standard VGA mode. There must be
some way of enabling this, but I have not worked it out.
Trident 8900/9000 chipsets:
- The Trident 8900 chipsets will not allow the extended CRT addressing
to pass the 512k memory mark, so page flipping will not work correctly
on 1Mb cards that try to access the upper 512k. There may be a
register value which will enable this, but I have not been able to
fix the problem.
S3 86c911:
- The S3 86c911 has some severe bugs in the extended CRT addressing
code in 1024x768 16 color modes. Page flipping works but looks
disgusting (bottom 1/8th of the screen is trashed). This bug is
fixed in the 924 and later chipsets.
Video7 chipsets:
- The video7 chipsets do not work presently. I am getting a Video7
board to test so should be able to fix the problems for a later
release.
QEMM memory manager:
- QEMM does some wierd things with the video BIOS, so you may encounter
problems when using the Universal VESA VBE with QEMM installed.
You will need to use the exclude option to get it to work at all
(see the readme file).