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-
- Log of BUGS and problems with UniVBE(tm)
- ----------------------------------------
-
- This file documents known problems with the Universal VESA VBE. SciTech
- Software have done their best to try to fix all known problems, but some
- still persist and may well be limitations in the particular video controller
- hardware and may not be fixable.
-
- Trident 8900 chipsets:
-
- - The Trident 8900 chipset does not seem to be able to page flip
- the 1024x768 16 color video mode, even though it works for all
- other video modes. Probably a bug in the chipset, since it does
- seem to work on the newer 8900C video cards.
-
- Tseng Labs ET3000AX chipsets:
-
- - The 800x600x16 color mode seems to wrap the 256k boundary, and at
- this stage there is no known solution.
-
- Weitek 5186/5286 chipsets:
-
- - For the moment the support seems to work, however there is a small
- bug that causes the card to do strange things after a mode has been
- set a number of times. This is currently being looked into.
-
- Compaq QVision chipsets:
-
- - The Compaq QVision cards are detected however the support is
- currently not working. This is currently being looked into.
-
- S3 chipsets:
-
- - 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.
-
- - Seems to be some bugs in the B-step 801/805 chipsets that cause the
- UniVBE to do strange things. Works on all the ones that we have
- tested.
-
- 320x200x256 standard VGA mode:
-
- - Many SuperVGA chipsets seems to disable the bank switching registers
- in the VGA standard 320x200x256 video mode, and hence extended page
- flipping techniques do not work. This may be solveable for some
- chipsets, or it may well be a hardware related problem (backwards
- compatability with the standard VGA). The chipsets that are known to
- currently suffer from this are:
-
- Cirrus Logic 54xx
- ATI
- Video7
- NCR
- Oak
-
-