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Posting-Version: version B 2.10.2 9/18/84; site looking.UUCP
Path: utzoo!watmath!looking!brad
From: brad@looking.UUCP (Brad Templeton)
Newsgroups: net.lang.pascal
Subject: Re: Turbo Cursor Off/On
Message-ID: <572@looking.UUCP>
Date: Sun, 8-Jun-86 02:24:06 EDT
Article-I.D.: looking.572
Posted: Sun Jun  8 02:24:06 1986
Date-Received: Sun, 8-Jun-86 06:19:46 EDT
References: <365@usc-oberon.UUCP> <1210@ncoast.UUCP>
Reply-To: brad@looking.UUCP (Brad Templeton)
Distribution: net
Organization: Looking Glass Software Ltd. Waterloo, Ontario
Lines: 35
Summary: 

In article <1210@ncoast.UUCP> allbery@ncoast.UUCP (Brandon Allbery) writes:
>
>I have a procedure to do this; anyone interested send mail.  I don't know if
>it's 2.0 compatible or not (I have 3.0).  It uses information stored in low
>RAM by MS-DOS and accesses the card (color or monochrome, there is a DOS
>pointer in low RAM which knows which is in use and contains the port number of
>the card), so it doesn't need INT 10 but DOES need a reasonably-compatible
>MS-DOS (Sanyo MBC550 need not apply).  Works fine on my ITT XTRA, I assume it
>will work on a PC/XT/AT since I got the tech info. from a book about those
>machines, but others are ???.

Don't send this guy mail to get this routine!  If you see any copies of it,
burn them quickly.

This is just crazy.  Why do people write routines like this?  Is it just
to drive people crazy or what?

IBM-PCs have an official way to deal with screen functions.  (This has
*nothing* to do with MS-DOS, by the way)  These routines aren't perfect, but
there is little excuse for not using them unless you want something that
they can't do.

Turbo Pascal & compatible systems have a built-in routine called "intr" that
makes interfacing to these routines easy.  Most C compilers have a similar
routine.

INT 10, function 15 (ah register) gets you the screen mode.  7 is monochrome
adapter, anything less is colour adapter or compatible, more is EGA or other
card.   Function 8 is cursor addressing.  Put -1 in dx and the cursor goes
away.

(I will admit that the above -1 is not documented, but it's still a damned
sight better than poking around in the BIOS ram!)
-- 
Brad Templeton, Looking Glass Software Ltd. - Waterloo, Ontario 519/884-7473