Path: utzoo!attcan!uunet!lll-winken!ames!nrl-cmf!ukma!psuvm.bitnet!mrs120
From: MRS120@PSUVM.BITNET
Newsgroups: comp.sys.ibm.pc
Subject: Mouse (int 33h) problems
Message-ID: <68532MRS120@PSUVM>
Date: 24 Jan 89 19:42:33 GMT
Organization: Penn State University - Center for Academic Computing
Lines: 34

I am trying to interface a Turbo Pascal 4.0 program with the Microsoft
Mouse driver & am having some difficulties.  My problem boils down to
the following:
     After loading the mouse driver & my program I want to configure
     the mouse so that when either button is pushed, an interrupt
     routine I have written (In Turbo pascal 4.0) is called & executed.

     Using Int 33h, setting AX to 12, CX to Mask, and DX to OFFSET, one
     would expect everything to work fine... wrong.  A detailed trace
     shows the OFFSET value being passed is pointing to La-La land &
     thus this doesn't work.  Fine.  Next try:

     Writting my OWN assembly routine (not trusting Turbo Pascal to pass
     a correct OFFSET value) still blows up the computer, BUT:  A trace
     shows the mouse driver correctly passing off control to my short
     assembly driver.  Unfortunately, all my routine attempts to do is
     RETurn control to the mouse interrupt routine.  Nothing happens
     & the system hangs.  Tracing shows the system returning to some
     empty segment of memory (ie: Definitely the wrong place).

     Any ideas?  Is there some mystic, Microsoft blessed, way of returning
     control from this?  Arghhhhhh!!!!!

     Thanx in advance...

----------------------------------------------------------------------------
                                 |
 Mark Supinski                   |  "Didja ever wonder what they do with
 MRS120@PSUVM.BITNET             |         frog ARMS?"
 Ma Bell (814) 867-2550          |
 U.S. Snail 207 Hammond Bldg     |   Ipsum Facto, E pluribus Unum, detente,
            Univ Park Pa 16801   |         Chow Mein, Glastnost...
                                 |                You get the idea......
_________________________________|__________________________________________