mike scott wrote:
On 6 May 2008 at 17:15, James Knott wrote:
Jerry Feldman wrote:
...
It was 1.5 stop bits back in 1976 when we were integrating a 1200bps
modem into our POS system. I'm not talking about Baudot code. In any
...
It was never 1.5 stop bits for ASCII devices. It was either 2 stop bits
at 110 b/s or 1 at 300 & above. It wouldn't hurt anything, other than
I'm not sure that's correct. I'm pretty sure it was an option (1,
1.5, 2) on VAX serial ports.
The option may have been available, as it was on the 8250 UART used in
the PC, where you'd set the number of data bits and stop bits
independently. However, in practice it simply wasn't done. I have also
worked with VAX 11/780 computers and many others. I've been working with
data communications & computers, virtually all of my career, going back
to 1972, when I was overhauling Teletype machines. I've also designed
and built from scratch an 8 port serial card and wrote a terminal
emulator that could handle both 5 & 8 level codes. In all that
experience, I've never seen 1.5 stop bits used with ASCII. It's always
been either 1 or 2. Incidentally, setting the number of stop bits
affects only the transmitter. It does change anything on the receiver,
as the sole purpose of the stop bits is to give the receiver time to
finish receiving one character, before the next one starts. This was
more of a concern with the older, mechanical devices.
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