Question about modems

geneb geneb at
Wed Nov 13 08:17:32 CST 2019

On Wed, 13 Nov 2019, Jim Brain via cctalk wrote:

> Did Hayes modem really do that?  I thought most later modems self detected 
> parity and speed and thus would have switched both the comm on the serial 
> port and the data sent to the other side in the same parity (if the terminal 
> was 7E1, the modem would configure as 7E1 and send 7 bit data to the other 
> side.
Jim, I'd try reaching out to Dale Heatherington - he wrote the firmware 
for the Smartmodem line.

At one point either he or Dennis Hayes had source code to the Hayes 1200B 
firmware online, but I can't find it any longer. :(


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