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Ian & Stuart's Australian Mac 1993 September
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1992-05-22
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Serial Mouse Driver
©1992 Charles Rentmeesters
CDware. If you use this software, you've probably saved a bundle on getting a IBM type
serial mouse, so spend a few bucks more and send me a CD. Either Musical CD's or
CDROM's. Send me something unique, send me something original. If you're in a foreign
country send me a CD in your native language.
Send to:
Charles Rentmeesters
410 N Carroll St
Madison, WI 53703
USA
I'd love to hear your sugestions. Email address:
roach@khan.cs.wisc.edu
rentmees@cae.wisc.edu
This cdev/init allows you to connect a IBM type serial mouse to your Macintosh, and use
that instead of the standard Macintosh mouse. It works with Microsoft and Mouse Systems
compatible mice. (just about the only two types of serial mice that are out there). You
can even use IBM type serial trackballs with it! Connect the mouse up to one of the serial
ports of your Macintosh, and drop this cdev/init into your System folder. Use the control
panel or System 7 to set-up the mouse driver. This allows you to set up which port the
mouse is connected to, and what type of mouse it is. It also allows you to modify the
event the mouse sends for each of the mouse buttons. Software written using the
Symantic Think C compiler, and tested on a Macintosh SE running system 7.0.
Connecting up the Serial Mouse:
To connect the serial mouse up to your Macintosh, you will need a serial cable. Some
serial mice can just use a standard modem serial cable that you can buy from many
computer stores. If that doesn't work, you can make your own serial cable for the mouse.
This is the standard pinouts for a serial mouse cable:
Macintosh Mouse
8minidin db9
Pin # Pin #
1 7
3 3
4 5
5 2
8 5
Helpful hints:
When installing the mouse driver, be sure you have a back-up way to move the mouse in
case you don't get it to work right away. Either keep your old ADB mouse connected,
or have Easy Access installed in your system. Also, terminal programs which are set-up
for the same port as the Serial Mouse Driver is set up for may crash. When making the
serial cable, it's easy to buy a Macintosh serial cable, and cut it in half and then solder
the db9 connector to the cut end. That way you don't have to do any soldering to a 8pin
mini din.
Serial Mouse Protocol (for Mouse Systems Mice):
Events are sent in 5 byte packets at 1200baud. The first byte is a sync byte, in the
format 10000LMR, anding any byte with $F8 and then comparing to $80 will tell you if
it's the sync byte. The bits L, M, and R and the status of the mouse buttons.
1 = button up, 0 = button down. The second byte in the packet is the horizontal change
in pixels. The third byte is a vertical change. The fourth and fifth bytes are horizontal
and vertical change bytes respectively.
Serial Mouse Protocol (for Microsoft Mice):
Events are sent in 3 byte packets at 1200baud. The first byte is a sync byte, in the
format 11LRYYXX, anding any byte with $C0 and then comparing to $C0 will tell you if
it's the sync byte. The bits L, and R and the status of the mouse buttons.
0 = button up, 1 = button down. YY is the most significant two bits of the vertical
movement. XX is the most significant two bits of the horizontal movement. The second
byte in the packet has the format 10XXXXXX. These are the lower 6 bits of the horizontal
movement. This must be combined with the two bits in the sync byte to get the value
for the horizontal movement. The third byte is of the format 10YYYYYY. This is the
lower 6 bits of the vertical movement. This must be combined with the sync byte like
the horizontal movement to get the value for the vertical movement.
Future ideas for the mouse driver:
I'm thinking about making a hardware solution to the problem as well, so that you can
hook the serial mouse up to a converter connected to the ADB port. Another idea is to
make an ADB converter for IBM AT compatible keyboards.
Other software by me:
"Chuck's Printer Driver" -- Allows you to connect an Epson compatible 9-pin or 24-pin
printer up to your Mac.
Disclaimer:
I take no responsibility for anything you my do to damage or destroy your Mac. This
software is used at your own risk. Microsoft, Mouse Systems, Epson, Macintosh,
Think C, and any other trademarks are copywrite of their respective owners.