Two PDP-8A questions

From: Ethan Dicks <>
Date: Sat Dec 11 16:40:17 1999

--- John B <> wrote:
> I hope someone can answer these questions...
> Where does the 16 pin front panel connector plug into the main options board
> and which way? (There are two sockets on the Options board)

It doesn't. It plugs into a 16-pin header/ribbon cable that comes from the
backplane. The two empty sockets are for user boot roms.

> Where does the main serial line plug into (which port on which board)?

The DKC8AA (I don't have the handle number here) - it has two Berg connectors
facing front (for the full front panel) and three facing backwards - the
one closest to the edge fingers is the serial connector. The other two,
for the sake of completeness, are 12-bits in and out. The output port can
be used to drive an LA-180, but the data is inverted from normal and the IOTs
are not the same. With a recompiled driver, however, you could drive a
parallel printer with it.

Do you need a copy of the 1977-1978 microcomputer handbook? I have a spare.
Let's talk.


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Received on Sat Dec 11 1999 - 16:40:17 GMT

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