Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!zaphod.mps.ohio-state.edu!mips!pacbell.com!att!att!fang!tarpit!bilver!bill
From: bill@bilver.uucp (Bill Vermillion)
Newsgroups: comp.dcom.modems
Subject: Re: 4.77MHz PC sufficient for 19200 bps modem?
Message-ID: <1991Jun26.150636.27190@bilver.uucp>
Date: 26 Jun 91 15:06:36 GMT
References: <243.2861EA82@zswamp.uucp>
Organization: W. J. Vermillion - Winter Park, FL
Lines: 37

In article <243.2861EA82@zswamp.uucp> root@zswamp.uucp (Geoffrey Welsh) writes:
>In a letter to All, Jonathan Hardwick (jch+@cs.cmu.edu ) wrote:
>
> >A housemate has an original Big Blue IBM PC, running at the blazing
> >speed of 4.77MHz....

> >....  Is the PC going to be able to keep up with 19200 bps?
 
 
>Answer: 9600 probably, 19200 probably not.
  

The biggest problem is in software.    Years ago, about 1984
probably, I had a terminal program called Dr. Term, from someone in
the Denver area.

This program had NO problems doing dumps to the PC at 19,200 with
NO flow control.  It was written with speed as the primary
objective.   The user interface was a bit weak but designed for
technical users.

One of the demos was to dump from a Kaypro CPM machine at full tilt
into the PC.  

The PC can do it, given the right software.  While most comm
programs seem to load a buffer, and then turn off receive while
writing to disk, this appeared to write continually.  I suspect it
wrote everytime it got enough for a new sector.  When downloading
to a floppy the floppy access light never went off.

But on the whole, most term programs I have seen seem to stumble
badly on anything approaching reasonably fast transfer speeds.


-- 
Bill Vermillion - UUCP: ...!tarpit!bilver!bill
                      : bill@bilver.UUCP