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From: milo@ndmath.uucp (Greg Corson)
Newsgroups: net.periphs,net.micro,net.wanted
Subject: Re: 192000 on a Mac, (was update on **real** 19200 CRT)
Message-ID: <130@ndmath.uucp>
Date: Wed, 20-Aug-86 16:05:13 EDT
Article-I.D.: ndmath.130
Posted: Wed Aug 20 16:05:13 1986
Date-Received: Sun, 24-Aug-86 05:12:05 EDT
References: <671@mordred.purdue.UUCP> <71@winfree.UUCP>
Organization: Notre Dame University, Math Department
Lines: 32
Keywords: Amiga,Macintosh, calculator gymnastics, scrolling speed
Xref: mnetor net.periphs:517 net.micro:5909 net.wanted:3734

I have been working on a terminal program for the Mac designed to operate at
9600 baud and above.  I can offer some real-world figures on how fast the Mac
can actually display characters...these figures are based on benchmarks on my
own code.

Special case scroll of 85x24 screen 1.07 ticks
(A tick is 1/60th of a second)

Character drawing (my code) over 4000 characters per second

With these speeds it is farely easy to put together a 19200 baud terminal 
program that requires little to no handshaking.  I have a prototype of my
program running now.  I have been using it connected to a Unix box over
a 19200 baud serial line.  So far, in normal use, NO handshaking has been
required, in fact it has never even come close to needing handshaking.  The
program has a 4k serial buffer allocated and the most the buffer has ever 
backed up is about 150 characters.  I'm sure if you fed the program 4000 line
feeds in a row it would eventually need to use the handshaking, but this is
very unlikely to ever happen in real life.  With a 4000 character per second
drawing rate the program quickly catches up with any scroll induced delays.

I will soon be releasing a version of this program as shareware, the first
version will probably emulate a DEC VT52---later versions may emulate more
complicated terminals...I chose the VT52 for the first version because it
is easy to do.  That way I can get the program released sooner.

If you are interested in getting this program please send me mail, the
more support I get from people on the net, the quicker I will get the 
program finished.

Greg Corson
pur-ee!iuvax!kangaro!milo