Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!oberon!nunki.usc.edu!aliu
From: aliu@nunki.usc.edu (Alejandro Liu)
Newsgroups: comp.sys.cbm
Subject: Re: 1350 Non-Proportional Mouse <==> 1350.1 Proportional Mouse
Summary: Missing the point?
Keywords: Non-Hacker in his first attempt at Hacking a Mouse
Message-ID: <2937@nunki.usc.edu>
Date: 6 Mar 89 01:07:14 GMT
References: <2924@nunki.usc.edu> <1438@csd4.milw.wisc.edu>
Reply-To: aliu@nunki.usc.edu (Alejandro Liu)
Organization: University of Southern California, Los Angeles, CA
Lines: 25

In article <1438@csd4.milw.wisc.edu> jgreco@csd4.milw.wisc.edu (Joe Greco) writes:
>In comp.sys.cbm article <2924@nunki.usc.edu>, aliu@nunki.usc.edu (Alejandro Liu) wrote:
>]   How does the 1350 mouse works?  Can it be possible to convert that
>]mouse in a more or less proportional mouse, by using the LightPen
>]interrupt?
>Forget the light-pen interrupt.  That's more or less useless.
>The C1350 is a nonproportional "joystick" that looks like a mouse.
>Why bother?  We already have a perfectly fine interrupt sixty times a
>second that is more than adequate to do the job.  Why make it harder
>than it already is?

You are missing my point here.  The light pen interrupt is not supposed
to just active a ML Routine to read the joystick.  It is supposed to be
used by the Joystick/mouse to tell the computer it finished doing something.
In the case of the mouse, it will signal the computer that it finished
travelling a fixed distance in direction x(or y).  So if I move the mouse
slowly, it will generate less interrupts as if I were moving the mouse
faster.  The more interrupts, the counters will increase (or decrease)
faster, thus simulating a proportional mouse.

Some computers, I think, use this method for their mices.
-- 
 
                    aliu@nunki.usc.edu (Alejandro Liu) 
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