If you want 80-column _monochrome_ (which I did for my bench setup since I
didn't have an RGB monitor handy to test these units with) it's not all that
hard to make an adapter cable to use. A fair number of different mono
monitors worked with this.
Right. Just connect pin 7.
If you're saying what I think you're saying, you get composite mono 80
colum vidoe on pin 7 of the DE9 'CGA' monitor connector, right?
Some PC CGA cards did the same thing. The original IBM one, of course,
had an RCA phono xosket for the compostie output, but some clones didn't,
maybe because they provided a printer port as well, and there wasn't room
on the bracket for all the connectors. In this case there is often (but
not always) compostied video on pin 7 of the DE9 connector.
-tony