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From: perkins@bnrmtv.UUCP (Henry Perkins)
Newsgroups: net.micro.pc
Subject: Re: Help on MASM/DOS-interrupt-handler question
Message-ID: <305@bnrmtv.UUCP>
Date: Tue, 8-Apr-86 20:44:35 EST
Article-I.D.: bnrmtv.305
Posted: Tue Apr  8 20:44:35 1986
Date-Received: Thu, 10-Apr-86 07:47:21 EST
References: <523@ucbjade.BERKELEY.EDU>
Organization: Bell Northern Research, Mtn. View, CA
Lines: 18

> The assembly program below was written as an attempt to do a small, quick,
> and dirty keyboard remapping routine for a friend.  It attempts to intercept
> the DOS keyboard read/look/status interrupt (16h) and translate the character
> and scan codes returned.

[lots of assembly code, and request for enlightenment, deleted]

A basic problem with your interrupt service routine is that is mucks
about with the flags before passing them on to the original routine.  You
do STI and CMP instructions, then PUSHF -- this passes flags substantially
different from what was intended.  You should instead do something like:

	PUSH    BP
	MOV     BP,SP
	PUSH    [BP+6]          ; Get the original flags off the stack
-- 

{hplabs,amdahl,3comvax}!bnrmtv!perkins          --Henry Perkins