Xref: utzoo comp.os.vms:3788 comp.editors:45
Path: utzoo!mnetor!uunet!husc6!rutgers!ames!hc!beta!unm-la!unmvax!charon!sdowdy
From: sdowdy@charon.unm.edu (Stephen Dowdy)
Newsgroups: comp.os.vms,comp.editors
Subject: VT100 confused by TPU
Message-ID: <2080@charon.unm.edu>
Date: 15 Dec 87 23:36:57 GMT
Reply-To: sdowdy@unmc.UUCP (Stephen Dowdy)
Distribution: na
Organization: University of New Mexico, Albuquerque, NM
Lines: 20
Keywords: VMS TPU vt100 firmware confusion

I am designing a minimal pager mechanism in TPU and have come across
a problem.  The pager, so far, works fine on all DEC crts that i have
tried, except for VT100's marked VT100-AA.  If i page up and down
several times, the vt100 gets extremely confused about what its
scrolling region is and where to put the next line of text.  This
problem persists even upon exiting TPU.  Doing something like
$ DIR/COLUMN=1	! or any command with plain text output
cause the screen output to jump from one line to another without
much relation to screen order.

I can get rid of the problem by SET TERM/NODEC_CRT, but this causes
a significant loss in screen efficiency.  (many users will probably
be running at 1200 baud, and redrawing the screen for single line
motions is not really acceptable).

Has anyone else noticed this problem (i assume it is just a non-compatible
firmware version in an older vt set) and does anyone have a solution
or work-around? (other than "get rid of the terminals", or "convert to unix");

--stephen dowdy