Hello, I have two ISA VGA cards with WDC 90C31 chipset, but both cards do not display anything in that 80386-33 based PC. Anyhow the PC boots from floppy or hardisk. With other VGA card (Paradise 256kB VGA card, Trident 8900C) the machine works fine.

Both WDC VGA cards have DIP swithches on the ISA slot. I think they are to set up the monitor type, but I can't find a description of the settings to see if they are set up correctly for a VGA color monitor.