[GreenKeys] Current Loop or RS232?

[Dave Wade]

> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-
> bounces at mailman.qth.net] On Behalf Of Christian Gauger-Cosgrove
> Sent: 16 September 2017 04:33
> To: Greenkeys <greenkeys at mailman.qth.net>
> Subject: Re: [GreenKeys] Current Loop or RS232?
> 
> 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?
> 

Looks like it to me.


> 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).
> 

You will probably do better asking on a computing specific list. If you have USENET NEWS there is a PDP-8 group. 
There is the CCTALK mail list which is probably the best place...
.. or the DECTEC list see http://dectec.info/ 

> 
> Cheers,
> Christian


Dave
G4UGM


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