Good haul of old pc stuph

Fred Cisin cisin at
Wed Dec 21 20:03:37 CST 2005

On Thu, 22 Dec 2005, Tony Duell wrote:
> > 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.

I had a Plantronics CGA double card that claimed to be able to do 640 x
400 as an added mode.
It did not have an RCA jack, but it did have the 4 pin berg, one pin of
which is composite.

Does the "Portable PC" connect its video to the RCA jack, or to the 4 pn
(Compaq's CGA and EGA have a 2 x 5 or 2 x 6 dual row set of pins near the
center of the board that they use to drive the EGA capable monitor that is
built in)

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