Macintosh mouse M0100

The M0100 mouse supplied by Apple with the original 128/512K Macintosh computers was a variation of the A9M0050 Lisa mouse that had been included with the Lisa system in 1983. It has chamfered edges and a slightly darker colour to match the Macintosh cabinet. Apple stated that the Model No. is M0100, although the bar code on the mouse actually indicates MO100.

The mouse incorporates two orthogonal roller shafts that are rotated by a precision rubber-coated steel track ball as it is moved over the mousepad surface. Each shaft carries an optical disc chopper of the infrared radiation from a pair of LEDs to a pair of photosensors, which are offset to deliver quadrature encoded up/down and left/right signals to the computer. When the spring-loaded microswitch is pressed, a contact to ground is closed. The LEDs and photosensors are powered by a 5v supply from the computer.

The mouse is connected to the computer by a 130 cm flexible tail, terminated with a DE-9 plug. Early plugs had a rectangular section, later ones were rounded.

Pin connections:
1 Gnd
2 Vcc
3 Gnd
4 Left
5 Right
6 N/C. The pin is often omitted
7 Switch
8 Down
9 Up

There are several variations of the mouse that carry the same M0100 model number. Early models had two securing screws near the cable end, later models one screw at the opposite end, and some even later models again had two screws. Although there were also many detailed changes to the internal design, all versions are functionally compatible.

The model matching the 128K Mac through to the Mac Plus is beige with a brown button. For later Mac Plus models, a platinum model was introduced, while a single-colour version with somewhat sleeker profile was made for the Apple IIc.

Aftermarket kits are available for converting the M0100 mouse to optical sensing, and for connecting it to USB. It has been estimated that around 1.7 million of the different versions of the M0100 mouse were manufactured.

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