On 08/14/2016 10:15 PM, Fred Cisin wrote: > why the unnecessary switches? (CGA does mode switching in software, > and enables simultaneous composite and RGB, hence the IBM vetsion > dorsn't need switches)
I think that the switches mostly relate to output configurations; that is, they don't change the basic operation. For example, the "monochrome composite" is probably just luminance, blank and sync (VBS), whereas the "color composite" is the complete CVBS signal. I suspect that setting either of the two composite modes probably disables the output at the DE-9. It would be interesting to see what other combinations of switches produce something useful. Of course, this is all wild-hare speculation on my part, as I don't have anything like this card sitting in my hellbox. FWIW, Chuck
