[GreenKeys] Current Loop or RS232?

[info at drukknop.nl]

Jep that's a M8650 pdp8 e/f/m uart card and its setup for currentloop. 
maybe you noticed a loop on the pcb side of the cable. that is to 
connect the serial out part of the card to de currentloop part.

all manuals are downloadable from bitsavers archive here:
http://bitsavers.org/pdf/dec/pdp8/pdp8e/

schematics are also there.

you should download the first three maintenance books for the jumper 
settings. this card is explained in Vol. 1 page 3.157


I'm in the process of fixing two machines right now. A 8/f and a 8/e and 
a BA8-AA expansion chassis. On the 8/f I made the failure to connect it 
to the BA8-AA with one ribbon cable the other way round, so a lot of 
N8235 chips are fried now. I almost have finished a replacement board 
for that chip...

our machine lives here (dutch language, use google translate)
https://hack42.nl/wiki/Digital_PDP-8f

Simon

On 16-09-17 01:40, Paul Heller 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!
> 
> I’ll be searching and reading up on this board.  And looking for a male 
> matching connector.
> 
> It’s great to have you folks in the community to help me through this 
> identification step
> 
> Paul
> W2TTY
> 
> 
> 
>> On Sep 15, 2017, at 3:43 PM, Paul Heller <paul0926 at comcast.net 
>> <mailto:paul0926 at comcast.net>> wrote:
>>
>> 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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> 
> 
> Paul
> W2TTY
> 
> ITTY: HTTP://INTERNET-TTY.NET:8000/ITTY <HTTP://internet-tty.net:8000/ITTY>
> 
> AUTO: HTTP://INTERNET-TTY.NET:8030/AUTOSTART 
> <HTTP://internet-tty.net:8030/AUTOSTART>
> 
> 
> 
> 
> 
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> 
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