Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site ptsfa.UUCP Path: utzoo!watmath!clyde!burl!hou3c!hocda!twitch!hocad!houxm!ihnp4!zehntel!dual!ptsfa!dsp From: dsp@ptsfa.UUCP (Dave St.Pierre ) Newsgroups: net.info-terms Subject: Re: vt100, :am:, :xn:, :in: Message-ID: <301@ptsfa.UUCP> Date: Thu, 18-Oct-84 13:48:37 EDT Article-I.D.: ptsfa.301 Posted: Thu Oct 18 13:48:37 1984 Date-Received: Sun, 21-Oct-84 15:17:35 EDT References: <459@uwvax.UUCP> <5084@brl-tgr.ARPA> <194@bragvax.UUCP> <297@ptsfa.UUCP> <5339@brl-tgr.ARPA> <368@umcp-cs.UUCP> Organization: Pacific Bell, San Francisco Lines: 42 > * From: gwyn@brl-tgr.ARPA (Doug Gwyn) > There is a common misconception about the VT100 and the xn/xenl > capability; ... The wrapping upon character insert is > independent of auto-margin and is supposed to be described by > the "in" capability. Hmmm ... Then I guess the documentation in terminfo(4) is in error (see Glitches and Braindamage, SV_R2). Also, termcap comes with a rather lengthy discussion on pros and cons. I COULD turn off am/xn; I have to for an emacs I have which doesn't know about the vagaries of vt100's on column 80. I leave it turned on when possible since our default initialization sequence turns on autowrap mode - it gets difficult reading long lines of text when it's all beating on the last column. Televideo 970's appear to be the same as vt100's, TTY 5420's do wrap "correctly", even though they're otherwise vt100 clones. I don't remember what my vt400 did, think it needed xenl. :in: doesn't really seem to be applicable to this problem or this terminal class at all. I've tried various combinations of am/mi/xn and run vi xxx > xxx.out;od -c xxx.out to see what's happening. All terminals issue cursor movement sequences when a line "wraps" in vi in standout mode to get to the next line. If "mi" is off it turns on insert mode and places the character at the beginning of the line; otherwise it just emits the character. Crosstalk just refuses to push ANY characters over to the right on the second line. There's supposed to be a new version of XTALK XVI out soon. Maybe this will be fixed. Or maybe I'll find out it's a feature. Nothing I was able to change in termcap/terminfo seemed to fix the problem. What I thought was more interresting was that the software really does support insert/delete modes. It makes windowing applications bearable. Thanks for all the discussion so far. I should note that I'm on vi 3.9, SV_R2. If anyone really comes up with a fix to termcap, please post it.