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Article #1356Re: VT100 scrolling region
From: Peter D. Smith
Date: Fri, 18 Dec 1992 16:36
Date: Fri, 18 Dec 1992 16:36
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1255 bytes
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
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arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!sun-barr!olivea!spool.mu.edu!uwm.edu!news.bbn.com!bbn.com!pdsmithReferences:
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Path: arc1-ca.pugleaf.net!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