Forgive me if I am repeating myself but my last last post never showed up as far as I can tell.

45.45 UARTs seem to be harder to come by than they used to be.

Here is my suggestion for making your own in Software.

I did a similar thing a few years ago.

My aim at the time was to decode signals from a Seeburg Wallbox.

(Those Juke box remotes you used to see in restaurant booths.)

The Seeburg sends a stream of 25VAC pulses.

These are very slow. I'm guessing even slower than 45.45.

What I came up with was a simple opt isolator circuit to change the 25VAC

pulses to 5VDC.

Then programmed an Arduino to decode the 5V pulses.

Just a simple polling loop on a GPIO pin to detect ones and zeros.

Here was the result. I'm thinking a similar approach might work for making a teletype interface.

-Steve