Connecting SIMH to teletype via USB

Charles charlesmorris800 at
Fri Sep 13 20:56:47 CDT 2019

I got ahead of myself a little bit... forgot I still couldn't connect a 
serial port to SIMH.

Turns out my version of SIMH 3.08 was from 2008 or so... I just downloaded 
the latest version 4 from GitHub and sure enough it does accept SET CONSOLE 
Now I just have to figure out the port name since it doesn't like COM4:
But I'm almost there :)

-----Original Message----- 
From: Charles
Sent: Friday, September 13, 2019 6:46 PM
To: J. David Bryan ; cctalk digest
Subject: Re: Connecting SIMH to teletype via USB

Update: got my SIMH (set console telnet:23) talking to PuTTY in another
window, via Telnet
So it is possible ;)
Now it's time to hook up the actual TTY to the USB-current loop card and see
what's what!

-----Original Message----- 
From: J. David Bryan
Sent: Friday, September 13, 2019 6:23 PM
To: General Discussion: On-Topic and Off-Topic Posts
Cc: Charles
Subject: Re: Connecting SIMH to teletype via USB

On Friday, September 13, 2019 at 15:42, Charles via cctalk wrote:

> I could use a hint... I have a USB to current-loop (Volpe) interface
> board, and Windows 7 on my laptop does recognize it as COM4 at 110
> baud. So far so good. No problem hooking it up to my ASR-33 Teletype.
> Now I'd really like to figure out how to set SIMH to use the 33 as the
> console, so the TTY will be attached to the virtual PDP-8.

Section 3.14, "Console Options" of the "SIMH Users' Guide V4.0" suggests

  set console serial=com4;110-8n2

...should work (though you might need "7e2" or "7o2" instead, depending on
how your Teletype is set up).

> Anything that starts with "set console..." gives a "no settable
> parameters" error.

Does the above also give this error?

                                      -- Dave 

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