riyadth@csusac.csus.edu (Riyadth Al-Kazily) (02/05/90)
Inexpensive replacement Amiga mouse How-To
After having come across the specs for the Logitech P7 bus mouse, I made
the discovery that it's operation is exactly the same as described in
my Hardware Reference Manual for the standard Amiga mouse. I happened
across a stash of P7 mice at HSC Electronic Supply in Santa Clara (see
address etc. at the end of this document). Unfortunately the mice are
only the two button variety, but the price was right, and it is definitely
an improvement over my original mouse - real switches in the buttons even!
The mouse is your basic Logitech-type mouse, model number P7-2F-SI. The
P7 is the type of mouse (Amiga compatible, bus style), the 2F means that
it has 2 buttons (I dont know what the F stands for, do any of you?).
The SI means that it was custom made for Systems Integrators. The mouse
cord ends in a modular connector with 8 conductors. In order to connect
it to the Amiga, a female DB9 must be connected, either by cutting the
modular plug off and soldering on the new connector, or (the way I did
it) by getting a modular DB9 adaptor, available at HSC.
With this particular mouse there is a slight electrical modification that
must be made for proper operation. Actually, it is an un-modification,
as the mouse was modified for Systems Integrators' application. There
is a trace on the mouse circuit board that has been cut and jumpered. To
use the mouse on the Amiga, the jumper must be removed and the cut trace
restored to it's original route with another jumper. Then all that remains
is to route the 8 conductors in the wire to the correct 8 pins on the
Amiga's mouse port.
The connections should go something as follows:
Amiga pin # function P7 wire color
1 V-pulse brown
2 H-pulse grey
3 VQ-pulse green
4 HQ-pulse yellow
5 middle blue (does not apply to this mouse)
6 left black
7 +5v white
8 GND pink
9 right clear
Note that the colors given may not be correct for all mice, so you may
want to open it up and check. The following is a pseudo-diagram of
the circuit board with colors in their appropriate place:
| L-BUTTON R-BUTTON
|
| (top row) ___ (bottom row)
| /___
| white o/___o- brown
| green o/___o- yellow LOGIMOUSE
| grey o/___o- pink P7
| blue o/___o- clear REV D
| black o/ o- red (shield gnd)
|
|
+----------------------------------------------------------------
And finally, for the information on how to get this mouse. Firstly, the
cost of the mouse was $7.95, and I was able to find one new in it's
original packing box, although many were out of the packaging. The
address of HSC is as follows:
HSC Electronic Supply
3500 Ryder Street
Santa Clara, CA 95051
orders - (800) 4-HALTED
in CA - (408) 732-1573
customer service - (408) 732-1854
Minimum order is $10 + shipping, $2 fee for orders under $20.
Don't forget to order DB9's and hoods if you need to bring your order
over $10, or order a couple for friends.
Have fun with the mouse. Now if only I could find a 3 button P7
lying around...
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riyadth alkazily {ucdavis,lll-crg}!csusac!riyadth