connecting 33 to PDP-8 - test-drb@ccmp.vtda.org

17 Dec 2002

On Tue, 17 Dec 2002 16:11:32 -0600, you wrote:

...
   The -8/E has
an M8650 (KL8E) which I've been using with RS232.  However,
 I have 40-way Berg connectors, and the proper AMP flat 8-way Mate-N-Lok
 connector shells for the 20mA loop, and the male and female pins... 
Sounds like you have the basics covered.  Don't forget the short jumper
wire at the Berg end that directs the TTL output of the KL8E shift
register to the 20mA output circuit.  It's a different loop than the 
one you should have right now on your EIA cable. 
I have a PDP-8/I and a Model 33 but there are no connectors at
all. The serial interface card (? M709) is there and if I run
clipleads to the appropriate pins on its backplane socket with a
series resistor to +12v it works, both keyboard and printer.

What pieces am I missing? The above discussion is beyond my
current understanding of DEC interconnect hardware. Should there
be a card that plugs into the backplane somewhere, that has a
pigtail hanging from it, or what? If so, what part number should I
be searching for?

thanks
Charles