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From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: net.micro
Subject: Re: terminal emulation
Message-ID: <249@neoucom.UUCP>
Date: Sun, 10-Aug-86 12:49:49 EDT
Article-I.D.: neoucom.249
Posted: Sun Aug 10 12:49:49 1986
Date-Received: Tue, 12-Aug-86 01:12:09 EDT
References: <2723@brl-smoke.ARPA> <7029@utzoo.UUCP>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 35
Summary: What baud rate = 1 line in a refresh period?

[By my line of reasoning, eat this...]

O.k., let's see what baud rate is necessary.  Presuming a 24 line
terminal with 24 lines, and 9*11 dot array for characters yeilds
sufficient readability, the CRT would probably be scanned at a rate
of either 50 or 60 Hz, depending on your part of the world.  The
above rates make engineers happy, as there are lots of standard TV
building blocks available.  Of course, there are things like Suns
and Ataris, as Henry Spencer noted. (66 and 71 Hz).

On average, presume that the scan rate will be 60 Hz.  While not
using a word processor with attendant [ANSI ?] control strings
necessary, the worst case would be needing to scroll an 80
character line.  80 char * 10 bits/char = 800 bits in 1/60 th
second.  Do that 60 times/second, and you'd need 48,000 baud to
maintain unbroken throughput.   Of course, average line length is
going to be less, so one could probably get away with a lower data
rate.

Given that an average 80 character line might contain on average 10
words, that would correspond to a reading skill 600 words/sec or
more comprehensibly stated prodigous 36,000 words per minute.  I'd
imagine that it would be hard to spot anything except for the
grossest pattern in a file whizing by at that clip!

As a final note, I don't know very many hosts that can fill an I/O
channel with that much data at an unbroken pace.  Once you discover
said perfect termianl, I suspect the nect step will be to obtain a
much faster host system (grin).

Bill Mayhew
Division of Basic Medical Sciences
Northeastern Ohio Universities' College of Medicine
Rootstown, OH  44272  USA   (216) 325-2511
(wtm@neoucom.UUCP)