Rod_cl wrote:
Does anyone know if this is the reason why the board is not working? Any ideas where to get those chips?
its possible.
best source for similar chips ale old vga trident isa cards

(there are 4 or 8 of them usually)
typical example
http://hem.passagen.se/alley_cat/Passagen/images/TridentVGA.jpg(xxx-15 means 150ns speed, and you can use faster of course)