On Tue, Sep 17, 2019 at 12:54 PM William Pechter <pechter@gmail.com> wrote:

Actually... IIRC the RJ11 was used on the VT2xx and 3xx series terminals. The MMJ was only on the RS232 port.

I would check, but I gave away my last non VT180 DEC terminal.

I stand corrected. I keep a VT420 on my desk with an LK421 (the "Unix" keyboard), connected to my workstation (now via a USB serial adapter). I just popped the keyboard and it is, indeed, an RJ11 for the keyboard. Serial is MMJ, which connects to an MMJ<->DB9 converter which connects to a mini null-modem to the USB adapter. So simple.

- Dan C.

-----Original Message-----
From: Dan Cross <crossd@gmail.com>
To: emanuel stiebler <emu@e-bbes.com>
Cc: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Sent: Tue, 17 Sep 2019 12:31
Subject: Re: [TUHS] PiDP-11 in action!

On Tue, Sep 17, 2019 at 2:23 AM emanuel stiebler <emu@e-bbes.com> wrote:
On 2019-09-17 04:51, Adam Thornton wrote:
> https://share.icloud.com/photos/0MKJjk8pRBvkZAEzaobjfOyPQ
>
> I start v7 Unix and play "Hunt The Wumpus".
>
> (I finally got it put together this weekend, and fixed the last couple
> dodgy joints tonight).

IBM keyboard on a vt520?

Huh; apparently the VT520 had (well, has...) a PS/2 compatible 6-pin mini-DIN connector: http://web.mit.edu/dosathena/doc/www/ek-vt520-rm.pdf

I'm most familiar with the earlier VT models that use MMJ connectors for the keyboard (and RS-232). That's kinda nifty, though.

- Dan C.