Editing Apple Mouse IIc (section)

=== Compatibility Issues ===

==== Early Mac Mouse on IIc ====

Some early Macintosh mice (M0100) don't work properly on the IIc:

'''Problem mice:'''
* Early Alps-manufactured M0100
* Some Taiwan-produced versions
* Mice with open-collector outputs

'''Symptoms:'''
* Not recognized by IIc
* Erratic cursor movement
* No response at all

'''Technical cause:'''
* Weak output drive capability
* Cannot overcome IIc's pull-up resistors
* Insufficient current to trigger NE556 inputs

==== Solutions ====

'''Hardware modifications:'''
* Replace comparator chip with push-pull output type
* Change µPC339 to TLC3704IN
* Modify pull-up resistor values
* Add buffer ICs

'''Alternative solutions:'''
* Use Apple Mouse IIc instead
* Use later USA-made M0100 versions
* Purchase IIc-specific mouse
* Use adapter devices