Path: utzoo!mnetor!uunet!husc6!mit-eddie!uw-beaver!cornell!rochester!ur-tut!aptr
From: aptr@ur-tut.UUCP (The Wumpus)
Newsgroups: comp.sys.att
Subject: Re: 50 lines on 6300 display
Message-ID: <793@ur-tut.UUCP>
Date: 9 Jan 88 16:39:21 GMT
References: <2634@mmintl.UUCP> <12465@oliveb.olivetti.com>
Reply-To: aptr@tut.cc.rochester.edu.UUCP (The Wumpus)
Organization: Univ. of Rochester Computing Center
Lines: 40

In article <12465@oliveb.olivetti.com> dragon@olivej.olivetti.com (Give me a quarter or I'll touch you) writes:
>in article <2634@mmintl.UUCP>, jeffm@mmintl.UUCP (Jeffrey Miller) says:
>
> > be  used?    What  is  the  Xerox  ANSI.SYS  doing?    Are  there  any
> > applications that can use 50 lines on the 6300?
>  
> > Jeff
> 
>Borland's REFLEX uses a mode which can display around 48 lines on a screen,
>*if* you tell it you are using an AT&T machine (it works fine out of the
>box in CGA mode).  It looks OK.  I've also seen something floating around
>that will display more lines on the screen under DOS...
>

The Xerox ANSI.SYS has nothing to do with the mode.  It is all done by
the Olivetti graphics card.  The mode is set simply by calling int 10
for SetMode and Clear Screen (ah=00) with (al=72).  This comes
straight out of the Xerox 6060 Family Technical Reference Manual.  The
mode is 80x50 and it is done by using a 8x8 bitmap for each character
instead of an 8x16 bitmap.

When going into the 80x50 mode, it is often dangerous to your sanity
to have ansi.sys installed.  Ansi.Sys does not know about 80x50
resolution and tries to do everything on an 80x25 section of the
screen.  This causes the problem that the 25th line is written over
itself and the screen does not scroll. If you start the system without
ansi.sys, the display hardware takes care of the proper scrolling and
the system works fine.

I actually have a copy of a pair of programs to set and unset 80x50
mode.  If anyone wants a copy, please e-mail me.  I will post it if
there is enough interest.  If there is not, I will just mail it to the
poeple who want it.


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