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From: elg@killer.UUCP (Eric Green)
Newsgroups: comp.sys.cbm
Subject: Re: 1200 +
Message-ID: <1197@killer.UUCP>
Date: Sun, 26-Jul-87 17:18:39 EDT
Article-I.D.: killer.1197
Posted: Sun Jul 26 17:18:39 1987
Date-Received: Tue, 28-Jul-87 02:29:11 EDT
References: <3989@udenva.UUCP>
Organization: Bayou Telecommunications
Lines: 22

in article <3989@udenva.UUCP>, slindahl@udenva.UUCP (Steve "Mr. MBA" Lindahl) says:
> My question is:  Can a Commodore 64 handle anything above 1200 baud?

The answer is "sort of". Just as WXMODEM or ZMODEM will only "sort of" work
with the C64. From what I've heard, the C64 can't recieve at a sustained 2400
baud, however, can transmit at near that rate. Something about the VIC][ chip
stealing too much time. Someone mentioned a 20% error rate in Xmodem
transfers.

By the way, what I'm talking about for WXMODEM or ZMODEM is that the C64
RS232 port apparently cannot recive characters at the same time that it is
transmitting them. Since flow control is necessary while the reciever goes to
save the last block to disk, unless you want to "fill the frame" (which
eliminates much of the speed advantage of a windowing protocol), this
effectively prohibits a WXMODEM or ZMODEM reciever for the C64. Be better to
just adapt a version of YMODEM, which would transfer as fast over PCPursuit as
a frame-filling ZMODEM, but without near the complexity of implementation....
--
Eric Green   elg%usl.CSNET     Ron Headrest: A President
{cbosgd,ihnp4}!killer!elg      for the Electronic Age!
Snail Mail P.O. Box 92191      
Lafayette, LA 70509            BBS phone #: 318-984-3854  300/1200 baud