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From: ckp@grebyn.com (Checkpoint Technologies)
Newsgroups: comp.os.minix,comp.sys.amiga,comp.sys.amiga.tech
Subject: Re: 75/1200 baud modem in software?
Message-ID: <12220@grebyn.com>
Date: 14 Jul 89 19:50:17 GMT
References: <417@bpdsun1.UUCP> <539@vice2utc.chalmers.se>
Reply-To: ckp@grebyn.UUCP (Checkpoint Technologies)
Followup-To: comp.os.minix
Organization: Grebyn Corp., Vienna, VA, USA
Lines: 26

In article <539@vice2utc.chalmers.se> d5kwedb@hacke9.dtek.chalmers.se (Kristian Wedberg) writes:
>I've written a Videotex program (Prestel type) for the Amiga, a kind of
>communication program. Trouble is, here in Sweden some folks have 75/1200
>modems instead of the more normal 1200/1200. 
>
>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?
>
	First of all, the Amiga's serial port bottoms out at 112 baud.
It's not possible to run it any slower. Secondly, the Amiga serial port
does not allow split baud rates, that is, running transmit and receive
at different speeds. The serial chip we use on our dual port serial card
allows both the 75 baud speed, and split rate operation, though the
driver we've written does not support split baud rates; and it plugs
into a Zorro slot, and I imagine you're really talking about the A500.
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.

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