## 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:
[[email protected]][1]
[[email protected]][2]

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 Symantec 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
8minidin
Pin # | Mouse
db9
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.

Compatibility
Architecture: 68k

  [1]: mailto:[email protected]
  [2]: mailto:[email protected]

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