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Path: utzoo!linus!decvax!decwrl!ucbvax!ulysses!pajb
From: pajb@ulysses.UUCP (Paul Bennett)
Newsgroups: net.emacs
Subject: Re: termcap cs string
Message-ID: <1133@ulysses.UUCP>
Date: Mon, 4-Nov-85 09:49:08 EST
Article-I.D.: ulysses.1133
Posted: Mon Nov  4 09:49:08 1985
Date-Received: Tue, 5-Nov-85 21:59:54 EST
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 41

In article aks@umcp-cd.UUCP writes
   ...........
 
   >Also, Zenith has a newer terminal, the H/Z-49, which allows flow control to
   >be completely disabled; however, this will require padding at appropriate
   >points, but also a proportional amount to the number of normal chars output,
   >effectively reducing the baud rate (we use 9600 baud).

Doesn't flow control cause the same thing ? I mean that's how it works, 
by temporariliy reducing the data rate, so the terminal can catch up.

I've run GNUemacs on hp's and a Teletype 5620 running layers and
standalone. By experimenting for about 10 minutes, I got the padding
for the hp's just right - it now doesn't send a XOFF at all while
running GNU emacs. I don't want to turn it off, because then it
doesn't work with the rest of Unix properly.

I can see NO difference in the effective baud/display rate, I have a
VERY useful incremental search on the keys where it has always been
(and which is mnemonic, too), and I have no problem with screen
updates. I run at 9600 baud.

Nowhere in the ASCII standard, or RS-232 for that matter, are DC1/DC3
defined as flow control characters. To use them for such is to
implement a flow control scheme that is NOT transparent to the domain
of possible transmission values. This is bad design. A flow control
scheme which allows all possible values to pass unheeded is to be
preferred. One such a scheme can be implemented by judicious use of
padding - another is to make use of hardware flow control. This is of
course the ideal, and is in line with RS-232.




-- 
Paul.

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