How to use both a VT-52 and an ASR-33 on a PDP-8A

william degnan billdegnan at
Tue Feb 23 06:17:51 CST 2016

> ________________________________________
> From: cctech <cctech-bounces at> on behalf of Marc Howard <
cramcram at>
> Sent: Thursday, February 18, 2016 7:40 PM
> To: General Discussion: On-Topic Posts Only
> Subject: How to use both a VT-52 and an ASR-33 on a PDP-8A
> Hi,
> Just looking for suggestions on how best to setup my PDP-8A so that it can
> use either a VT-52 (current loop version) or an ASR-33.
> One idea I have is a multi-pole switch to change the baud rate from 110 to
> 9600 and to also switch the xmit and rcv current loops.
> Does anyone out there have any other suggestions?
> Thanks,
> Marc

I don't have one, but can't  you attach two devices to the M8316 and just
assign program IO to the teletype and typewriter/printout to the vt52?  If
the m8316 does not have multiple ports a second serial card would be used,
right?  They must have this documented in the peripheral handbook that
corresponds with the 8a.


The comms characteristics are set on the

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