Good haul of old pc stuph

[Tony Duell]

> Original IBM CGA has ONE RCA jack (for composite video), NOT TWO.
> EGA often has two, and there are some aftermarket CGA boards that have a
> color composite and a B&W composite jack.

Clone CGA cards with no RCA sockets sometimes put the composite signal on 
pin 7 of the DE9 connector (this is a no-connect on the iBM card). Worth 
checking there anyway.

-tony