
                 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

