[GreenKeys] Current Loop or RS232?

[Dave Wade]

I think they can be either and some have links for either. The card it plugs
into should have an M number on it. Then get the docs for the card and see
how its plugged.

So for the M8655 card the docs are here:-

https://homepage.divms.uiowa.edu/~jones/pdp8/hard8e/kl8ja.html

of course if it's a "straight 8" with flip chips which pre-dates OmniBus you
will need the system documentation..

Dave



> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-
> bounces at mailman.qth.net] On Behalf Of Paul Heller
> Sent: 15 September 2017 22:44
> To: Greenkeys <greenkeys at mailman.qth.net>
> Subject: [GreenKeys] Current Loop or RS232?
> 
> After looking a long time I finally got hold of a PDP8. I got it from
another
> ham. The guy I got it from said he used to have a teletype hooked up to
it.
> 
> Is there a way I can determine if it is a current loop or an RS232
interface?  I
> assume if I guess wrong I could damage the teletype or the terminal board
in
> the computer. Is this a valid worry?
> 
> 
> Thanks for any help. I'm a newbie to DEC computers. Maybe I can finally
put
> that tape relay in my teletype to good use.
> 
> Paul
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