Hello

Maybe someone has already seen this or has an idea

The problem is related to a isa video card VG-8000 rev b with a wd90c31a chip.
Tested on two screens (CRT and LCD) as well as on two différent computer.

(on my 486, which works without problems with other vidéo cards and without specific video drivers)
In the bios or under dos, no problem.

- As soon as I run a program like game, bench, the display is striated of vertical bands

- Under windows 3.11 with the basic windows driver, the windows boot picture is red and anything that is black is no longer displayed in the menu + trouble display


- + Under windows 3.11 with the western digital driver, the background becomes brown (blue normally) the image of the cursor is bugged and in general, the display seems overwritten.

// on another machine with a windows 98, I have the same problem of display with vertical bands like on the 486 under dos when launching apps

I spent quite a bit of time trying different modes with the video driver and with switch block 1 next to the video output.

The card does not seem damaged, I cleaned it, some tracks are not very beautiful but they are not cut (tested with a multimeter).

It may be something very silly. Or the card may be just défective (the seller told me that he had tested it under windows 3.1 before sending it to me and he didnt had any problem with it).

Curious point, the CRT monitor tells me an input resolution of something like 700x400 (I do not have the exact value, I have to update it tonight), it reminds me of a discussion about this kind of problem with the same vidéo chip but it didnt helped me more about what happend.

Thank you very much to have read my message (and sorry for my bad english writting).
Any help is welcome 😀