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- Path: sparky!uunet!stanford.edu!rutgers!igor.rutgers.edu!zodiac.rutgers.edu!leichter
- From: leichter@zodiac.rutgers.edu
- Newsgroups: comp.terminals
- Subject: Re: VT320 DECTSR Terminal State Report Meanings
- Message-ID: <1992Sep9.100642.1@zodiac.rutgers.edu>
- Date: 9 Sep 92 14:06:42 GMT
- References: <1992Sep4.214917.25679@jupiter.sun.csd.unb.ca>
- Sender: news@igor.rutgers.edu
- Organization: Rutgers University Department of Computer Science
- Lines: 37
- Nntp-Posting-Host: cancer.rutgers.edu
-
- In article <1992Sep4.214917.25679@jupiter.sun.csd.unb.ca>, dedgar@mta.ca writes:
- | Hello Net
- |
- | I am looking for the meaning of the bytes returned by the DECTSR function
- | on a VT320. Does any body know these? The VT320 reference manual does
- | not list them specifically.
-
- The format of DECTSR is explicitly, and deliberately, undocumented. It can
- vary between different firmware versions of the same terminal model, and will
- certainly differ between terminal models. (Theoretically, it could even vary
- between different instances of the SAME terminal model running the SAME firm-
- ware version, though given the nature of the technology, this is of course
- pretty unlikely!)
-
- The ONLY supported use of the DECTSR sequence is to send it back to the
- terminal that sent it to you, thus restoring the terminal's state to where it
- was. There is a whole group of additional state queries with documented
- syntax that you can use if you need to do anything else.
-
- While I originally specified this architecture, and was involved with the
- details of the VT330 specification (but not the coding), I have absolutely no
- idea what the contents of a DECTSR string are. We left that entirely up to
- the firmware implementors. My guess is that it's effectively a memory dump
- of one or more internal data areas. (We suggested that a checksum also be
- included, partly to protect from damaged DECTSR strings, partly to prevent
- accidentaly use of a DECTSR string from a different firmware version - and
- partly to help dissuade people from mucking with the DECTSR string.)
-
- | All help gratefully appreciated. Please reply to me directly rather than
- | use up net bandwidth on this rather obscure topic.
-
- Since you don't even offer to post a summary, I take this to mean that you
- don't want to be bothered to follow this group for responses. Well, tough.
-
- -- Jerry
- (One-time member of
- DEC's terminal group)
-