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From: tomb@hplsla.HP.COM (Tom Bruhns)
Newsgroups: comp.sys.cbm
Subject: Re: 1200baud with the C-64?
Message-ID: <6580004@hplsla.HP.COM>
Date: Fri, 9-Oct-87 15:43:28 EDT
Article-I.D.: hplsla.6580004
Posted: Fri Oct  9 15:43:28 1987
Date-Received: Mon, 12-Oct-87 01:30:18 EDT
References: <9500004@altger.UUCP>
Organization: HP Lake Stevens, WA
Lines: 16

I have some information on this buried somewhere.  I used to use my c-64
quite successfully at 1200 baud, and at 2400 with some coaxing, using
any of several terminal emulator programs I got from a local bbs.  (Used
to, only because I've become Amiga-ized lately)  The problem has to do
with the software in rom which does the serial-to-parallel conversion.
As I recall, it sets some bit times that don't account for quite all the
time that the instructions take (total time = hardware timer plus some
instruction overhead).  This is a non-problem at slower speeds, but
causes screw-ups at high speeds.  Try to follow up with a local (to you)
bbs; they should know.  Else, you can e-mail me and I'll try to look up
the details for you -- but I don't read this group all that often now.

Cheers,

Tom Bruhns
hplabs!hplsla!tomb