Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!gatech!hubcap!ncrcae!ncrlnk!uunet!portal!cup.portal.com!Brendan
From: Brendan@cup.portal.com (Brendan P Kehoe)
Newsgroups: comp.sys.cbm
Subject: Re: 2400-baud Modem for C128?
Message-ID: <14755@cup.portal.com>
Date: 18 Feb 89 00:12:04 GMT
References: <418@unicom.UUCP> <14656@cup.portal.com> <6540@emcard.UUCP>
Distribution: usa
Organization: The Portal System (TM)
Lines: 36

In article <6540@emcard.uucp>, mat@emcard.uucp (W Mat Waites) writes:
>In article <14656@cup.portal.com> Brendan@cup.portal.com (Brendan P Kehoe) writes:
>}you might want to keep in mind if it's for the 64 is that it isn't known for
>}its grace in handling 2400..in the Feb 89 issue of the Transactor, there's an
>}article with the source code for proper 2400 handling on a 64...it may be a
>}little while before terms start showing up that have it in it.
>}Brendan@cup.portal.com
>
>Has anyone keyed in the Transactor code? How well does it work, etc?

 I put it into the terminal program that I'm working on for the C128..until my
RS232C interface finally comes (or I get the gumption up to build the thing),
I won't be able to test it (hehe and I'm keeping this term a relative secret
til I release it, so I'm at a standstill)..one thing I noticed with the source,
though..it has 3 start bit and full bit times, for 300, 1200, and 2400 baud
respectively..but I'll be damned if I can figure out where George Hug came
up with them (my term offers the standard 12-rate list that're in a table in
the 128's rom)..they are:

start24 $1cb/459
start12 $442/1090
start3 $1333/4915
full24 $1a5/421
full12 $34d/845
full3 $d52/3410

 Maybe someone out there sees a pattern or reason that I don't..but until I
can find out *how* those came about, it's next to useless for me..
 Oh I might mention that a few weeks ago Chris Smeets, in a conference on
GEnie, said that he had source that would give reliable 4800bps throughput
on a C64 and 9600 on a C128 (he added the 9600, utilizing the 2MHz clock)..
he said that he'd be putting it up in their libraries, but I haven't seen
it yet..but when it IS I'm dying to see it...now how to get a USR Courier 9600
for less than $200 <grin>.

                                                Brendan@cup.portal.com