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Article #1713

Re: VT100's keeping up at high baud rates

#1713
From: Mark W. Eichin
Date: Wed, 17 Jun 1987 17:20
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Not all microprocessor controlled terminals lose... in a previous job,
I worked with Visual 200 terminals-24x80, lots of PF keys, keypad,
smooth scroll (REAL smooth scroll, by pixels), nice heavy feel...

AND IT DID 19200 baud W/O FLOW CONTROL!

It was PERFECT at 9600baud, but at 19200 it didn't scan the keyboard
as often. This was tested by driving it with a tight machine language
loop on a 6Mhz z80 system, directly controlling the UART. You got one
keyscan per 500-600 characters. Enough, but a bit confusing when
trying to pause it. (We used ^S/^Q as HUMAN flow control - when the
USER couldn't keep up, hit ^S to pause it.)

This terminal had a 2Mhz Z80 inside, or maybe two of them... a bunch
of roms, too.

We had the roms set to have the WordStar sequences in the PF keys;
this worked well, since we could program the 20 keys, 20 shifted keys,
PLUS the 15 key keypad (toggled between numbers and functions, and
which one was shifted.)

I don't know if these terminals are still around. We had difficulty
getting them after a while. They may have (shudder) EVOLVED since then...
/Happy Hacking........\\.............Mark Eichin/
<eichin@ATHENA.MIT.EDU><SIPB member & Watchmaker>
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From: eichin@athena.mit.edu (Mark W. Eichin)
Newsgroups: comp.terminals
Subject: Re: VT100's keeping up at high baud rates
Message-ID: <941@bloom-beacon.MIT.EDU>
Date: Wed, 17-Jun-87 13:20:30 EDT
Article-I.D.: bloom-be.941
Posted: Wed Jun 17 13:20:30 1987
Date-Received: Sun, 21-Jun-87 09:54:00 EDT
References: <1149@carthage.swatsun.UUCP> <8601@tekecs.TEK.COM>
Sender: daemon@bloom-beacon.MIT.EDU
Reply-To: eichin@athena.mit.edu (Mark W. Eichin)
Organization: Massachvsetts Institvte of Technology
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