Connecting The Amx Mouse - AMX Mouse User Manual

Fig: 2: Connecting the AMX Mouse
The AMX Mouse is compatible with all other Paged roms tested, as well as with the
6502 2nd processor. Since the Mouse is connected to the only User Port it cannot be used
when other devices are plugged into the port. However only 5 bits of the port, and CB1,CB2
are used: This leaves bits 1,3 and 4 available for other uses.
Two vectors are used by the AMX ROM, namely the EVENT Vector (EVENTV &220,
1) and the KEYBOARD Vector (KEYV &228,9). These vectors cannot be used by other
ROMs as they will automatically disable the Mouse. These vectors can be changed by the
user, if the original contents are stored, and returned to at the end of the intercepting
routine.