15 Aug
2016
15 Aug
'16
6:05 a.m.
My apologies for my previous post; I have not yet
received the original
post. Thank you, Matt, for having quoted it.
It does, indeed look like an aftermarket CGA.
I assume the 'CGA' in the name in the silkscreen is relevant!
The DE connector on there is 9 pin (see solder side),
and is probably CGA
RGB. (NOT VGA!!)
It only has 16K RAM, a pair of 4416s so it's not EGA or VGA.
BUT....
There were a lot of 3rd party cards that could be configured (DIP switches)
to be either MDA (often hercules compatible graphics) or CGA. You had to
use the right monitor, of course.
A trace going to pin 7 of the DE9 is a clue (it's unused on the original CGA
board, it's video on the MDA) but not always. Some CGA-only cards put
the composite signal on pin 7.
-tony