Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!torsqnt!tmsoft!masnet!canremote!ed.leslie
From: ed.leslie@canremote.uucp (ED LESLIE)
Newsgroups: comp.sys.ibm.pc
Subject: Re: i/o routines and non-stan
Message-ID: <89121507252971@masnet.uucp>
Date: 13 Dec 89 18:36:00 GMT
Organization: Canada Remote Systems Limited, Mississauga, ON, Canada
Lines: 19

TO: joefritz@pawl.rpi.edu

ju>In article <41644@srcsip.UUCP> rogers@src.honeywell.com (Brynn
ju>Rogers) writes: >In article <966@maytag.waterloo.edu>
ju>dmurdoch@watstat.waterloo.edu (Duncan Murdoch) writes: >
>The Bytes relevant to changing screen sizes are:  (as far as I know)
>
>40:84  Rows - 1   (probably a leftover EGA BIOS bug that keeps it 1
ju>smaller)
 (some deleted)

In the programming of video controller chips, one of the parameters set into a 
chip hardware register is the 'last scan line'. They do, in fact, start 
numbering the scan lines at zero, hence the number stored here is 'n-1', the 
value set in the chip. 

Regards....Ed
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 * QDeLuxe 1.01 #1656