Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!cica!iuvax!mailrus!cornell!uw-beaver!ubc-cs!alberta!calgary!cpsc!lauch
From: lauch@cpsc.ucalgary.ca (Christopher Lau)
Newsgroups: comp.sys.apple
Subject: Re: Manuals, Mice, and the PC Transporter
Summary: Apple compatible mouse, constructing, modifying
Keywords: Mouse, MUNG, Mung Until No Good
Message-ID: <1685@cs-spool.calgary.UUCP>
Date: 10 Aug 89 02:17:18 GMT
References: <2328@uwovax.uwo.ca> <1520@cs-spool.calgary.UUCP> <741@greens.UUCP>
Reply-To: lauch@vaxa.UUCP (Christopher Lau)
Organization: U. of Calgary, Calgary, Alberta, Canada
Lines: 52

In article <741@greens.UUCP> matthew@sunpix.UUCP ( Sun Visualization Products) writes:
>
>WARNING!!!! If you are refering to the first Apple //c Tech. Ref. Manual, The
>schematics in chapter 11 are backwards.  The one titled 'hand control' is
>actually the 'mouse circuit' and vice-versa.  
>

Are you sure??  They look OK to me.. but then again I have the 2nd printing
of the manual.


>What do you mean by "The mouse select is active (pin 1 on the 9 pin DIN 
>connector)".  Unless this pin is grounded the mouse/joystick port will think 
>its in the joystick mode.
>

Grounded??  it says on p 267 of my manual for pin 1:
1	MouseID*	Mouse identifier: when active, disables NE556 hand
			controller timer

Following this, I've got pin one pulled high through a resistor so it is
"active"..  unless the book is wrong here.. but I don't think so because
as I've said in my original article, the mouse button works, and it only
works if pin 1 is pulled high..  the part that doesn't work is the movement..
I don't know if it's the characteristics of the Apple //c port (I don't
understand those graphs of the signals that they give, and I'm taking
Electrical Engineering!!), the mice that I have are pretty standard as mice
go..  They've got 4 opto-couplers with the wheel thingy in the middle, and
all these are connected to an LM339 quad comparator which effectively
switches the output of the animal from 0 to 5V (actually 0.76V to 4.78V I
think.. can't remember offhand)..  I've got the output connected to the
correct mouse movement pins on the 9-pin connector, but for some reason
when the beast is connected to the Apple, some of these outputs are pulled
low..  Not all of them, but some of them..  one of them actually triggers
correctly and you can produce movement on the screen, but only in one
direction..  what am I doing wrong??  can someone please describe the complete
circuit of the mouse, including the electronics??

Thanks in advance..
Chris Lau


>
>-- 
>Matthew Lee Stier                            |
>Sun Microsystems ---  RTP, NC  27709-3447    |     "Wisconsin   Escapee"
>uucp:  sun!mstier or mcnc!rti!sunpix!matthew |
>phone: (919) 469-8300 fax: (919) 460-8355    |

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