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From: liber@darth.UUCP (Eric Liber)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Mouse problems (for left hander)
Message-ID: <431@darth.UUCP>
Date: 14 Feb 89 18:26:36 GMT
References: <40970003@hpindda.HP.COM>
Organization: Darth Software, Allison Park, Pa.
Lines: 32

> I just bought a MSC (formerly Mouse Systems) PC Mouse II which
> has two buttons and being a left hander I'd like to swop the
> buttons around so that I can use it more easily.
> 
.
.
I have done extensive playing with several various mice.  As i see it you 
only have 2 choices.  

1) Write your own mouse driver to replace the one that came with your mouse.
While definately not for the faint of heart I suspect that a few days of 
hacking about would get you there.  A call to MSC to see if they have a 
technical manual on the mouse is definately in order.  Such a manual is 
absolutely a necessity in any such undertaking.

2) Somewhat simpler is to write a TSR routine that grabs int 33h (the mouse
interrupt and looks for requests for button information and reverses the logic.
That is:  if you send a mouse interrupt request #5 (let's say .. I don't have
my manual handy and my memory is not what it used to be :-) ) and it is
supposed to return bx bit 0 = left button and bx bit 1 = right button then
reversing those bits before returning to the calling program would do what 
you want.  This routine would have to intercept the int 33 call and make its
own call to where int33 used to point then the mouse routine would return to 
your intercept routine and you would return to the calling program with
the appropriate registers modified.

one other thought ... I believe that some of the mice (Logitech???) may
allow you to do this very thing through their click routine.  If so you
might want to sell the pc mouse and get a logitech.  I will check my reference
manuals tonight and report back.

Eric (the red baron) Liber