Article View: alt.msdos.programmer
Article #417Re: i/o routines and non-standard video modes
From: Marko
Date: Mon, 04 Dec 1989 02:31
Date: Mon, 04 Dec 1989 02:31
17 lines
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1442 bytes
In article <89320.130954CMH117@PSUVM.BITNET>, CMH117@PSUVM.BITNET (Charles Hannum) writes:
> DOS (not necessarily BIOS) is hard-coded
> to work with only the first 25 lines of the screen. The problem here is that
> to do anything else, DOS would have to automagically sense the current screen
> size, which, since it uses BIOS calls, would tremendously slow down screen
> I/O.
I don't think screen handling is terribly slow in DOS 4.0, but it knows
whether the screen is in 80*25 or 80*50 line mode. Easy to use (command
is "mode ,50", but too few programs check whether they are running on
80*25 or 80*50 line screen. Of course, all DOS programs do it,
especially more.
--
E-Mail: teittinen@finuh.bitnet ! "Studying is the only way
teittinen@cc.helsinki.fi ! to do nothing without
Marko Teittinen, student of computer science ! anyone blaming you" -me
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<2090@calvin.EE.CORNELL.EDU> <2980@einstein.ptolemy.arc.nasa.gov> <2092@calvin.EE.CORNELL.EDU> <2544@alva.tut.fi> <89320.130954CMH117@PSUVM.BITNET>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucbvax!bloom-beacon!eru!luth!sunic!tut!hydra!hylka!teittinen From: TEITTINEN@cc.helsinki.fi (Marko) Newsgroups: alt.msdos.programmer,comp.sys.ibm.pc Subject: Re: i/o routines and non-standard video modes Message-ID: <1494@cc.helsinki.fi> Date: 4 Dec 89 02:31:16 GMT References: <2090@calvin.EE.CORNELL.EDU> <2980@einstein.ptolemy.arc.nasa.gov> <2092@calvin.EE.CORNELL.EDU> <2544@alva.tut.fi> <89320.130954CMH117@PSUVM.BITNET> Organization: University of Helsinki Lines: 17