Subject: 230.4 serial port speed?
To: MacBSD Mailing List <port-mac68k@NetBSD.ORG>
From: David Bushong <dbushong@saidin.EECS.Berkeley.EDU>
List: port-mac68k
Date: 08/26/1997 01:35:11
I was wondering if any progress had been made on the serial drivers in
terms of supported speed, and at the same time, if someone could clear up
some confusion on my part..

The issue:  I have an Epson Stylus Color 600 printer which wants its
serial data at 230.4Kbps  I know this because if I fire up ZTerm under
MacOS, set it to 230.4 and type plaintext it'll print it correctly.  Now,
a while back someone mailed me a kernel patch which would allow me to stty
the serial port speed to 230400, but I still couldn't send data out over
it (it would essentially lock the machine up)  

My main question is: _why_ does setting the port speed to 230.4 work under
MacOS?  (e.g. I can talk to the printer w/ ZTerm and talk between two Macs
running ZTerm set to 230.4)  I thought the max speed on old serial ports
was 57.6?  

My second (and perhaps more relevant) question is: what could i do to
help/who could I pester to get the driver working at these speeds?  It's
apparent the hw _can_ do it.. so the OS should be able to too =)

    _/_/_/_/  _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
     _/   _/ _/   _/ _/   _/  David P. Bushong -- (510) 845-3271         _/
    _/   _/ _/_/_/  _/_/_/   dbushong@cory.eecs.berkeley.edu            _/
   _/   _/ _/      _/   _/  http://www-inst.eecs.berkeley.edu/~dbushong_/
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