koonce@chex.Berkeley.EDU (tim koonce) (09/01/88)
When testing out a vt100 emulator program, a friend of mine discovered that EVE running under VMS expects it to interpret ^Z [ ... q as an LED command. This is undocumented, and runs contrary to the documentation I have. He claims that other vt100 compatible terminals he's used recognize this. Does anyone have more information about this or any other undocumented "features" of the vt100 series? - Tim Koonce koonce@math.berkeley.edu ...!ucbvax!math!koonce
gwyn@smoke.ARPA (Doug Gwyn ) (09/01/88)
In article <13801@agate.BERKELEY.EDU> koonce@math.berkeley.edu writes:
-When testing out a vt100 emulator program, a friend of mine discovered
-that EVE running under VMS expects it to interpret ^Z [ ... q as an
-LED command. This is undocumented, and runs contrary to the documentation
-I have. He claims that other vt100 compatible terminals he's used
-recognize this. Does anyone have more information about this or any
-other undocumented "features" of the vt100 series?
I don't know what you mean by "undocumented". It is described on
page 48 of my copy of the VT100 User Guide.john@trigraph.UUCP (John Chew) (09/02/88)
In article <8411@smoke.ARPA> gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>) writes: )In article <13801@agate.BERKELEY.EDU> koonce@math.berkeley.edu writes: )-When testing out a vt100 emulator program, a friend of mine discovered )-that EVE running under VMS expects it to interpret ^Z [ ... q as an )-LED command. This is undocumented, and runs contrary to the documentation )-I have. ) )I don't know what you mean by "undocumented". It is described on )page 48 of my copy of the VT100 User Guide. Hmm. Not in *my* copy of the VT100 User Guide. It does mention the "ESC [ ... q" escape sequence which turns on any of the four status LEDs or turns them all off, with parameter values of 1, 2, 3, 4 or 0. But on VT100s and most clones, ^Z just prints a blot on the screen. Every decent VT100 clone I have seen supports at least one status LED and usually all four. John Chew -- john j. chew, iii poslfit@utorgpu.bitnet trigraph, inc. poslfit@gpu.utcs.toronto.edu toronto, canada {uunet!mnetor!utzoo,utgpu,utcsri}!trigraph!john [it is my opinion that these are solely my opinions.]
gwyn@smoke.ARPA (Doug Gwyn ) (09/04/88)
>)-... EVE running under VMS expects it to interpret ^Z [ ... q as an >)-LED command. I assumed the fellow meant ESC not ctrl-Z. No program in its right mind would expect ctrl-Z anything to act as an ANSI X3.64 escape sequence.
pechter@dasys1.UUCP (Bill Pechter) (09/04/88)
In article <13801@agate.BERKELEY.EDU> koonce@math.berkeley.edu writes: >When testing out a vt100 emulator program, a friend of mine discovered >that EVE running under VMS expects it to interpret ^Z [ ... q as an >LED command. This is undocumented, and runs contrary to the documentation >I have. Does anyone have more information about this or any other undocumented "features" of the vt100 series? There'a a number of undocumented "features" on the VT100 - some of which are real nasty microcode bugs in the firmware. The <ESC>[a;b;c;d q series which are used for the leds are a bear. There's a pattern that turns on the LOCAL (or was it ON LINE) led regardless of whether the terminal was on line. Another turned on the bell continuously, another was a high speed autorepeat. Hit a key and it filled the screen. I believe DECUS had someone write an article about this for the Vax Pageswapper SIG publication. I'd love a copy if anyone has it. We used to send the bell one around at DEC as a "letter bomb" -- send the sequence to someone to read and BOOM. Mail now filters the sequences! -- Bill Pechter {sun!hoptoad,cmcl2!phri}!dasys1!pechter USnail 103 Governors Road, Lakewood, NJ 08701 AT&T 201-370-0709 Evenings
blarson@skat.usc.edu (Bob Larson) (09/05/88)
In article <6249@dasys1.UUCP> pechter@dasys1.UUCP (Bill Pechter) writes: >There'a a number of undocumented "features" on the VT100 - some of which >are real nasty microcode bugs in the firmware. My favorites: Infinite wait mode (display wait in the upper left corner until someone hits the power switch): <esc>[?2;8y Flashing background mode (also puts the terminal in local): <esc>[?2;15y (I think) Disabling flow control and sending scrolling region sequences at 2400 baud would drive the vt100 batty, sometimes doing such things as 24 copies of one line (the one with the cursor, the terminal still works!) reverse scroling (linefeed means go up a line) etc. Usually the terminal would reset itself eventually. (If you didn't guess, the policy of not letting students read the manual wasn't very efective, it led us to things we wouldn't have found otherwise.) Some of the documented sequences were fun too: Tops-10 had a way to type a file (in a public directory) from a not logged in terminal. By putting a ^E in the end of the file and programming the answerback buffer, an infinite loop displaying the file could be created. Bob Larson Arpa: Blarson@Ecla.Usc.Edu blarson@skat.usc.edu Uucp: {sdcrdcf,cit-vax}!oberon!skat!blarson Prime mailing list: info-prime-request%ais1@ecla.usc.edu oberon!ais1!info-prime-request
koonce@wish-bone.Berkeley.EDU (tim koonce) (09/07/88)
In article <401@trigraph.UUCP>, john@trigraph.UUCP (John Chew) writes: > In article <8411@smoke.ARPA> gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>) writes: > )In article <13801@agate.BERKELEY.EDU> koonce@math.berkeley.edu writes: > )-When testing out a vt100 emulator program, a friend of mine discovered > )-that EVE running under VMS expects it to interpret ^Z [ ... q as an > )-LED command. This is undocumented, and runs contrary to the documentation > )-I have. > ) > )I don't know what you mean by "undocumented". It is described on > )page 48 of my copy of the VT100 User Guide. > > Hmm. Not in *my* copy of the VT100 User Guide. The question did, in fact, refer to the use of ^Z, rather than ESC. Luckily, I found out that the problem was due to a bug in the local installation of EVE, which caused it to send ^Z for that sequence. In regards to the other odd behaviors that people mentioned, is there a good summary somewhere of some of these? Also, does anyone know what the phrase 'ANSI graphics' refers to? - Tim Koonce koonce@math.berkeley.edu ...!ucbvax!math!koonce