Two PDP-8A questions - test-drb@ccmp.vtda.org

11 Dec 1999

-----Original Message-----
From: Ethan Dicks &lt;ethan_dicks(a)yahoo.com&gt;
To: Discussion re-collecting of classic computers
&lt;classiccmp(a)u.washington.edu&gt;
Date: Saturday, December 11, 1999 5:40 PM
Subject: Re: Two PDP-8A questions

...

--- John B &lt;dylanb(a)sympatico.ca&gt; 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.

Thank you. I don't get books on all these systems until next weekend.

...
   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.

Okay thanks.. I will work on the RK05s now.. they both have a bad -15V
supply...but bioth work fine when tipped on their left hand side.

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

-ethan

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