[GreenKeys] ASR33 modem

[Chris Elmquist]

Hi Barry,

I too have a ASR-33 with AJ modem installed.  I believe you can
disconnect the modem from the tty loop by disconnecting the one cable
which terminates in a MOLEX connector at the back of the tty where there
are a number of other MOLEX connectors.  I apologize that I don't have
the J# for you but I am at work and the tty and all the docs are at home.

But as far as I know, there is only a single connector that carries the
TX and RX loops between the tty and the modem.

I have my modem disconnected and instead have an RS232 to 20mA converter
plugged into the tty's MOLEX connector where the modem used to be and it
works great.

Chris N0JCF

On Wednesday (08/04/2010 at 03:11PM -0600), B M wrote:
> On my ASR-33, an Anderson-Jacobson acoustic coupled modem (ADT-233) is
> installed.  Does anyone have information on this modem?  I have
> googled around, but have only come across the patent for the device,
> but no further information.
> 
> I am looking to connect the TTY up to my ancient PDP-11 computer, but
> I need to be sure the modem is sufficiently disconnected for the
> direct connection.
> 
> Thanks!
> 
> --barrym
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-- 
Chris Elmquist