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From: jsoc@lasspvax.UUCP (John Socha)
Newsgroups: net.micro.pc
Subject: Re: What do the "reserved" PC-DOS INTs do?
Message-ID: <132@lasspvax.UUCP>
Date: Tue, 27-Nov-84 12:49:07 EST
Article-I.D.: lasspvax.132
Posted: Tue Nov 27 12:49:07 1984
Date-Received: Thu, 29-Nov-84 03:25:40 EST
References: <>
Reply-To: jsoc@lasspvax.UUCP (John Socha)
Organization: Theory Center (Cornell University)
Lines: 21
Summary: 

In article <> jm@tekadg.UUCP (Jeff Mizener) writes:
>
> ...what do the reserved INTs do?  Like INT 10?  This one I
>know -- pass it 0Fh in AH, and it returns the number of columns in the
>current display in AH.

INT 10H is one of the ROM BIOS interrupts that's quite useful.  You'll
find a full description at the end of the IBM Technical Reference
manual (not to be confused with the DOS Tech. Ref. man.).  Amoung other
functions, these routines write characters to the screen, move the cursor,
and scroll windows.  So they're worth learning about.  The IBM Tech. Ref.
manual contains full listings of all the machine language programs in the
ROM BIOS, and that's worth the price of the Tech. Ref. manual.

Or, and this is a biased add, you can check page 196 of Assembly Language
Safari on the IBM PC: First Explorations, a book from Brady (part of
Prentice Hall).  You'll also find lots of information on how to use the
ROM BIOS calls for screen I/O.  (I'm biased because I'm the author.)

	John Socha
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