Keypad emulation is working great, either with 3 button or 6 button genesis controller.

LEDs are mounted on protoboard to monitor the state of the lines driving the multiplexers.

Verified interrupt mechanism to cut the directional outputs when voltage CAV drops down to zero and keep like that until the next rise. This should deal with ATARI 5200 trackball/joystick detection.

Activation of trigger buttons and axes was tested with leds on outputs. Need to finish the wire on protoboard and test on port emulator but I consider that the firmware reached a beta stage.