Serial port speed

[henry at zoo.toronto.edu]

>With our SCSI based serial port expander, baud rates can be any arbitrary
>value up to almost 150K baud.  And that limit is there only because the
>particular RS232 drivers that it uses starts to produce triangle waves
>rather than square waves 8-).

If one is being picky, one should note that that speeds beyond about 38400
are violations of the RS232C spec, which sets a limit on the speed of the
transitions from positive to negative.  Even 38400 is marginal, actually.
Old RS232C drivers seldom implement the transition-rate-limiting, though,
and with short cables and forgiving conditions the high rates generally
will work.

                                         Henry Spencer at U of Toronto Zoology
                                          henry at zoo.toronto.edu   utzoo!henry