Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!agate!bionet!csd4.milw.wisc.edu!jgreco
From: jgreco@csd4.milw.wisc.edu (Joe Greco)
Newsgroups: comp.sys.cbm
Subject: Re: 1350 Non-Proportional Mouse <==> 1350.1 Proportional Mouse
Keywords: Non-Hacker in his first attempt at Hacking a Mouse
Message-ID: <1438@csd4.milw.wisc.edu>
Date: 5 Mar 89 18:54:26 GMT
References: <2924@nunki.usc.edu>
Sender: news@csd4.milw.wisc.edu
Reply-To: jgreco@csd4.milw.wisc.edu (Joe Greco)
Organization: UW-Milwaukee Home for Out-of-date 8 bit Hackers
Lines: 57

In comp.sys.cbm article <2924@nunki.usc.edu>, aliu@nunki.usc.edu (Alejandro Liu) wrote:
]>MUNCH< >MUNCH< >MUNCH< >MUNCH< >MUNCH< >MUNCH< >MUNCH< >MUNCH< 
]
]Hi,
]   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.
Commodore must have been out of their minds when they designed it.
Somebody must have thought "If it looks like a mouse and sounds like a
mouse, it must BE a mouse".... but it's just a fancy joystick.

When you roll the mouse in direction A, it is equivalent to pushing a
joystick in that direction.  BFD.

]The way I think it could be is that you rewire the outputs, so
]everytime the mouse moves a certain distance, it will generate an
]interrupt, the same way as you generate an interrupt when you press
]the joystick button on port 1, and the Lightpen interrupt is enabled.
]So, a driver can be writen, that will enabled by that interrupt, and
]update some counter in memory.

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?

I never had a C1350 (had a  C1351 for about a month before trading it
for something)....  but I did design an IRQ based driver with screen
pointer and everything for it.  It was designed for actual use,
too....  It featured a selectable pointer/watch sprite, single pixel
resolution, registers to store the coordinates of the last place that
was "clicked" (rudimentary buffering), and dual speed motion (if you
went in s single direction for more than a few seconds, it doubled
it's speed).

]Is this idea possible, or I have a wild imagination?
](BTW, I have no idea how the 1350 Mouse works, so this ramblimgs might
]be full B.S.)

Questions?  Please ask.  Please don't ask for source, I probably don't
have it any more.

]-- 
] 
]                    aliu@nunki.usc.edu (Alejandro Liu) 
](Simple .signature, $CHEAP$) 
]

Better than some 15 line sigs I've seen!  :-)
--
jgreco@csd4.milw.wisc.edu		Joe Greco at FidoNet 1:154/200
USnail: 9905 W Montana Ave			     PunterNet Node 30 or 31
	West Allis, WI  53227-3329	"These aren't anybody's opinions."
Voice:	414/321-6184			Data: 414/321-9287 (Happy Hacker's BBS)