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- Path: sparky!uunet!cs.utexas.edu!sun-barr!olivea!spool.mu.edu!uwm.edu!news.bbn.com!bbn.com!pdsmith
- From: pdsmith@bbn.com (Peter D. Smith)
- Newsgroups: comp.terminals
- Subject: Re: VT100 scrolling region
- Summary: Answer to the questions
- Message-ID: <lj3vgrINNieu@news.bbn.com>
- Date: 18 Dec 92 16:36:43 GMT
- References: <18623@mindlink.bc.ca>
- Lines: 23
- NNTP-Posting-Host: bbn.com
-
- In article <18623@mindlink.bc.ca>, Frank@mindlink.bc.ca (Frank I. Reiter) writes:
- > Part of an application I am working on includes a VT100 emulator. We thought
- > this was complete...
-
- Terminal emulators are always harder than they look.
-
- > 1) Does ESC [;22r mean "scroll lines 0 through 22" or does it mean "Set the
- > bottom scrolling line to 22, leave the top line as it is set already" ?
-
- It should mean 'scroll lines 1 to 22'. Remember that these sequences
- could be implemented in TTL without a microprocessor of any kind & therefore
- use the simplest possible implementation.
-
- >
- > 2) Should a clear screen code clear the scrolling region only, or the entire
- > screen? How about a clear to end of screen?
- >
-
- I think this is the whole screen regardless of the scrolling region.
- Don't bet your company on it, though.
-
-
- Peter D. Smith
-