[GreenKeys] Current Loop or RS232?

[Christian Gauger-Cosgrove]

On 15 September 2017 at 19:40, Paul Heller <paul0926 at comcast.net> wrote:
>
> Thanks to Marc, Dave, Pete and Wayne for the replies thus far.  It is a PDP-8M.  The interface board is M8650. Photo is attached for both the board and the connector. The connecto has 8 femal pins, but only 6 are wired.
>
> 6?? I’ll have to figure the pinouts for that!
>
The group should be able to correct me if I'm wrong, but isn't the
molex style connector with six pins the "standard" DEC 20mA current
loop interface?

Of course, you will definitely want to double check the board setup.


> I’ll be searching and reading up on this board.  And looking for a male matching connector.
>
The card itself is a KL8E, the older style async serial card. Doug
Jones' website has data on it's configuration:
<http://homepage.divms.uiowa.edu/~jones/pdp8/hard8e/kl8e.html>

BitSavers unfortunately doesn't have data on the KL8E, only the KL8JA
(M8655; the updated newer card).


Cheers,
Christian