Autofire Adapter for the Commodore 64 Control Ports
Features
Dual Port, configurable Autofire Adapter for the C64 with any digital Joystick
No external power supply; powered by the Commodore 64
Tap on/ Tap off function
no potis, no switches, 1 button control
configurable for 4 different autofire speeds; 10Hz, 3,8Hz, 1,9Hz, 1,2Hz
highly stable autofire frequency, due to hardware timers
Port A and Port B fully independent
fire button overrides autofire (f.e. load weapon KATAKIS)
port functions fully retained; mouse or other appliances can be used without restrictions
autofire speed for each port is retained for next power-up (saved to eeprom)
autofire off on computer power-up (no more glitches due to forgotten Autofire switch ;-) )
 
To use this project on the other machines than C64 probably some modifications are needed, because of mechanical limitiations, electricaly the platforms are compatible.