Eric,

TWX & TELEX started out (in the 1930s) with 5 bit Baudot machines. As it got more popular, they moved to ASCII, but that meant that they had to have converters so that 5-bit & 8-bit machines could converse with each other.

The Teletype Corp. Model 26 was designed as a cheaper, low-duty, machine for TWX. (But they never got the volume of the M26 up to where it could be built cheaper than the M15.)

Duncan
K2OEQ

On 2/2/2025 8:44 PM, Eric Moore wrote:

Thank you, was yours an external model, or a combined UCC and modem?

I am wondering if this is a modem, or just a UCC and control interface for an external modem.

It looks like enough electronics to be a modem. Was TWX ascii? Was it just AFSK serial ascii? I had thought telex predated the 33, so assumed it would just be baudot.

-Eric

On Sun, Feb 2, 2025, 6:55 PM Jeffrey Golas <[email protected]> wrote:

So being TWX means its likely for a 33. I found that the one I had with a modem, its basically a copy of a standard modem which may be an accoustic coupler if its rotary.

Jeff

> On Feb 2, 2025, at 5:55 PM, Eric Moore <[email protected]> wrote:
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