Getting desparate for TRS-80 serial card

From: Sellam Ismail <>
Date: Mon Jan 22 00:24:04 2001

On Sun, 21 Jan 2001, Tony Duell wrote:

> You could always do what I have to do when I can't find a necessary piece
> of ancient hardware.... Get out a soldering iron and _build_ one... :-)

I wish I had the time, Tony. And I wish I had your skills ;)

> The TRS-80 serial board is not complex, and the schematic exists. It's in
> the manual, and it was printed in one of Bill Barden's articles in Byte
> in the mid 1980s. The necessary chips are almost all available -- the
> only thing that would be hard to get now is the COM8116 baud rate
> generator, and you can kludge over that particularly if you only need one
> baud rate.

I could probably track down the COM8116 at a local surplus store, but
again it's the time factor. Also, I don't have the manual (or at least
don't know where I might have a copy since everything I have is buried)
and haven't been able to find one online.

However, I have come up with solution. The software I'm trying to run
requires two TRS-80's to be connected together via a modem connection or a
null modem serial connection. I have a couple each Modem I's, Modem II's,
and other variations (Ib, etc). It seems the Expansion Interface doesn't
need the serial port option to connect to a modem, correct? So I'm just
going to use two Modem II's and a telco line simulator (or two PBX
extensions) for the telco loop.

If this works then I won't need the serial port boards.

Sellam Ismail Vintage Computer Festival
International Man of Intrigue and Danger
Received on Mon Jan 22 2001 - 00:24:04 GMT

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