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From: rde@ukc.UUCP (R.D.Eager)
Newsgroups: net.micro,net.micro.pc
Subject: DOS Interrupt 29H
Message-ID: <5170@ukc.UUCP>
Date: Sun, 26-May-85 19:48:27 EDT
Article-I.D.: ukc.5170
Posted: Sun May 26 19:48:27 1985
Date-Received: Tue, 21-May-85 05:08:22 EDT
Reply-To: rde@ukc.UUCP (R.D.Eager)
Organization: Computing Laboratory, U of Kent at Canterbury, UK
Lines: 26
Xref: linus net.micro:9170 net.micro.pc:3709


I  have  been grovelling around the ANSI.SYS driver and I notice support
for a single character output function via INT 29H. This also  seems  to
be in the standard CON driver in IO.SYS/IBMBIO.SYS.

I have two questions:

1. What  is  it  for? Is it useful to programs in that it can be used in
situations when more  normal  methods  cannot? or  is  it  just  another
"Internal to DOS" thing?

2. Why  doesn't  the  documentation  mention  it? Yes, I know it doesn't
*have* to be documented, and why should they (etc). BUT....how the  hell
is  one  supposed  to  write  console  drivers for special purposes when
information like  this  is  withheld? Usual  Microsoft/IBM  attitude,  I
suppose....

Any ideas, please?
-- 
           Bob Eager

           rde@ukc.UUCP
           rde@ukc
           ...!mcvax!ukc!rde

           Phone: +44 227 66822 ext 7589