Xref: utzoo comp.sys.att:8130 unix-pc.general:4191
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!think!mintaka!mit-eddie!rutgers!att!icus!limbic!gil
From: gil@limbic.UUCP (Gil Kloepfer Jr.)
Newsgroups: comp.sys.att,unix-pc.general
Subject: Re: 7300 and 9600 baud modems
Summary: It's not an 8080!
Message-ID: <581@limbic.UUCP>
Date: 26 Nov 89 09:38:29 GMT
References: <3311@convex.UUCP> <24425@cup.portal.com>
Reply-To: gil@limbic.UUCP (Gil Kloepfer Jr.)
Organization: ICUS Software Systems, Islip, NY
Lines: 33

In article <24425@cup.portal.com> thad@cup.portal.com (Thad P Floryan) writes:
>without all the brain-damage.  In other words, DT80 mode does not have to
>send the humongous number of pad characters to accomodate the slow 8080
>in a real VT100.

The real VT100s have an 8037 micrcontroller (it's a preprogrammed MCU),
not an 8080 (at least mine doesn't anyhow...).  They do use some 8080-type
support chips though to do some of the work.

On an aside, this *is* the reason why the DEC VT100 is so slow.  The
VT220s I think might also use MCUs, but it's MUCH faster, and will
show 19.2K really well!

Also note, in line with what Thad has already said, using a terminal
on the UNIX-pc rather than the built-in display for just text-based
stuff, like reading the news, is definitely faster.  The VT100 I use
at 9600 baud (because of the speed problem) in the living room is
still faster than the 3B1 display!

A problem I *have* noticed is calling at Trailblazer speed to a system
from my VT100 *through* the UNIX-pc results in many lost characters
on my receiving end.  I'm not sure whether this is due to the 3B1 not
being able to handle 2 serial ports at high-speed, or the VT100 being
too slow and causing too many characters to be queued-up at the device
driver level.  In any event, forcing the Telebit speed to 9600 baud
doesn't fix the problem.

Gil.

-----
| Gil Kloepfer, Jr.
| ICUS Software Systems/Bowne Management Systems (depending on where I am)
| ...ames!limbic!gil


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