When I got started in RTTY a couple of years ago, I went looking on EBay for
a cheap USB to RS232 converter. There were a number available, but I picked
one that had a picture were I could read the chip identification. Both the
16550x and 16650x series of UARTS will support 5 bit code at the usual baud
rates.
While uarts are available with other chip sets (which may or may not support 5
bit codes), there doesn't appear to be any indications that these chip sets are
going to disappear.
I did buy some USB uarts that just would not work at all - but my money was
quickly refunded. I think that using hardware generated baudot takes one
complication out of the picture.
Villy VE6SQ
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