From:	patrick AT klos DOT com (Patrick Klos)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: int 21h and assembler
Date:	7 Nov 2000 02:03:11 GMT
Organization:	Klos Technologies, Inc.
Lines:	25
Message-ID:	<8u7nsv$5f7$1@pyrite.mv.net>
References:	<8u7ft0$6r3$1 AT nnrp1 DOT deja DOT com>
NNTP-Posting-Host:	iridium.mv.net
X-Trace:	pyrite.mv.net 973562591 5607 199.125.85.17 (7 Nov 2000 02:03:11 GMT)
X-Complaints-To:	abuse AT mv DOT com
NNTP-Posting-Date:	7 Nov 2000 02:03:11 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

In article <8u7ft0$6r3$1 AT nnrp1 DOT deja DOT com>,  <danspam2000 AT my-deja DOT com> wrote:
>I am quite new to assembler, but i need to service a hardware interrupt
>very quickly, so have had to code using inline assembler code.

By "inline assembler", you mean inside C or Pascal?  Do you have the basic
interrupt routine and you just need to optimize it?

>The problem i have is that i can't seem to get a definitive answer
>about how to protect the service routine in memory. 

How do you mean "protect the service routine in memory"??  I've written
a hundred interrupt handlers, but I've never had to "protect" any memory.
Or is this interrupt handler part of a TSR rather then an application?

>I think that i
>should use int 21H, but some books and lists say to use service 48 and
>some say 49, and one said 27! Also, i am not sure exactly what i need
>to pass, and using which registers (some say dx and some say bx), do i
>need to pass a segment or an offset, or both?

Post more specifics about what you need please.
============================================================================
    Patrick Klos                           Email: patrick AT klos DOT com
    Klos Technologies, Inc.                Web:   http://www.klos.com/
============================================================================

- Raw text -