Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!sun-barr!cs.utexas.edu!uunet!mcvax!ukc!axion!galadriel!pcf
From: pcf@galadriel.bt.co.uk (Pete French)
Newsgroups: comp.os.minix
Subject: Re: 75/1200 baud modem in software?
Message-ID: <290@galadriel.bt.co.uk>
Date: 18 Jul 89 07:41:20 GMT
References: <12220@grebyn.com>
Organization: RT6115, BTRL, Martlesham Heath, England
Lines: 22

From article <12220@grebyn.com>, by ckp@grebyn.com (Checkpoint Technologies):
> In article <539@vice2utc.chalmers.se> d5kwedb@hacke9.dtek.chalmers.se (Kristian Wedberg) writes:
>>
>>As it is, I have no idea how to support 75/1200, or indeed, if it's at all
>>possible.
>>
>>Altzo, is it possible to transmit 75 bit/s and receive 1200 bit/s over
>>the serial port? At the same time? Or would you need some kind of transformer?
>>
> It's not possible to bang the bits on the Amiga serial port manually, so
> I don't know how to solve your problem, sorry.
> 

To run a 1200/75 host you only need to receive at 75 not Tx. Try receiving at
300 ignoring errors.You will get 4 chars for each one sent. Then do some
fiddling to decode it. But most modems that support 1200/75 communicate to
the host at 1200/1200 anyway to avoid this problem. Are you sure that your
modem will support the 75 baud back-channel (tones = 390/450 I think) ?

-Pete French. {pcf@uk.co.bt.galadriel}

PS: You might get a better response in comp.dcom.modems rather that minix...