On Thu, Mar 07, 2013 at 03:46:31PM -0500, Ethan Dicks wrote: I'm sure I Will Kranz hooked me up with one -- but thanks very much for the offer! Sure enough, the VT102 has a *third* style of autowrap (slightly different different (on the VT100, just about everything restarts the blink period at the about-to-turn-on point but the 102 doesn't seem to bother unless something *visible* happens). John Wilson D Bit

On Wed, Mar 13, 2013 at 02:36:23AM -0400, Mouse wrote: That's correct, but the funny part is what unrelated stuff causes the "wrap" flag to get cleared. This is off the top of my head so may be buggy: write printing character: if not in final column then write character to screen advance cursor clear "wrap" flag else if "wrap" flag set then <CRLF> (even if ESC [?7l has been received since last printing char) now write char in column 1 as above else write char in final column (don't advance cursor) if ESC [?7h mode then set "wrap" flag else clear "wrap" flag endif endif endif Other things that clear the wrap flag: VT100: nothing! (practically) any escape code or ctrl char does its thing w/o affecting wrap flag Ex.: write a char at col 80, then use ESC [ A / B / C / D and/or ESC [ y ; x H to move around but wind up at col 80 of any line and write another char => wraps VT101: anything that causes the cursor to leave the current line CR, BS, TAB, ESC [xC, ESC [xD, ESC [ <this line> ; col H etc. don't LF, ESC [xA, ESC [xB, ESC [ <not this line> ; col H etc. do Ex.: write a char at col 80, then use ESC [ C / D etc. or BS/TAB to move around this line but wind up at col 80 and write another char => wraps VT102: anything that moves the cursor ESC [m etc. doesn't, so it's not just any data of any kind, but if the cursor moves then the flag clears Ex.: write a char at col 80, ESC [D, ESC [C, write another => no wrap (at least that's what I have so far) Seems like no big deal, but the VTTEST package (at least the version I've tried) expects VT102/VT220 behavior and pronounces the actual DEC VT100 (and anything that emulates its wrap behavior) as unworthy, which takes a certain amount of chutzpah. So I'm having fun obsessing over this lately. John Wilson D Bit

On Wed, Mar 13, 2013 at 11:18:26AM -0400, Mouse wrote: I know the feeling! Bad news: unless I'm missing something, tab doesn't clear the wrap flag on the VT100 or 101, and on the 102 it clears it only if the cursor moves (but not if it was already at the right margin). If you want any cases tested on a real 100, 101, or 102, let me know! It'll be easy until I get sick of having them in a row on my living room floor. John Wilson D Bit