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From: jr@LF-SERVER-2.BBN.COM.UUCP
Newsgroups: comp.emacs
Subject: Re: flow control by termcap
Message-ID: <8707091316.AA20406@ucbvax.Berkeley.EDU>
Date: Thu, 9-Jul-87 09:17:21 EDT
Article-I.D.: ucbvax.8707091316.AA20406
Posted: Thu Jul  9 09:17:21 1987
Date-Received: Sat, 11-Jul-87 19:38:33 EDT
References: <494@yetti.UUCP>
Sender: daemon@ucbvax.BERKELEY.EDU
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Organization: The ARPA Internet
Lines: 32

>> In article <493@yetti.UUCP> mike@yetti.UUCP (Mike Clarkson ) writes:
>> >
>> >You missed the point entirely.  It's not the GNU Emacs algorithm that's
>> >faulty, it's the termcap distributed with GNU Emacs that has the scroll
>> >regions disabled.

From termcap.ucb in the 18.47:

d0|vt100|vt100-am|vt100am|dec vt100:\
	:do=^J:co#80:li#24:cl=50\E[;H\E[2J:sf=5\ED:\
	:le=^H:bs:am:cm=5\E[%i%d;%dH:nd=2\E[C:up=2\E[A:\
	:ce=3\E[K:cd=50\E[J:so=2\E[7m:se=2\E[m:us=2\E[4m:ue=2\E[m:\
	:md=2\E[1m:mr=2\E[7m:mb=2\E[5m:me=2\E[m:is=\E[1;24r\E[24;1H:\
	:rf=/usr/lib/tabset/vt100:\
	:rs=\E>\E[?3l\E[?4l\E[?5l\E[?7h\E[?8h:ks=\E[?1h\E=:ke=\E[?1l\E>:\
	:ku=\EOA:kd=\EOB:kr=\EOC:kl=\EOD:kb=^H:\
	:ho=\E[H:k1=\EOP:k2=\EOQ:k3=\EOR:k4=\EOS:pt:sr=5\EM:vt#3:xn:\
	:sc=\E7:rc=\E8:cs=\E[%i%d;%dr:

And indeed emacs is using the scrolling region as I type on my vt100
(emulator) right now.

Now Mike, as I recall, is a VMS user, and the termcap for VMS,
termcap.dat, does not have the scrolling regions enabled.  Try adding
the cs= capability above if you wish to experiment.  (or substitute
termcap.ucb for termcap.dat if you dare).

It could be a VMS dependency.  Perhaps the vt100 driver in VMS thinks
it knows where the scrolling region is, and messing with it in a user
program is dangerous.

/jr