JSX-C
From MSX Game Library
Protocol
Proposal for a protocol to handle joypads with a variable number of sticks and buttons, plug in the MSX’s general purpose port.
This protocol can manage joypads with up to 15 analog axis (one stick requires 2 axis) and 18 buttons.
Pin 8 is used to synchronize data transmission:
- Leaving Pin 8 LOW for long enough (>1 ms, about 3580 t-states) resets the joystick's internal counter,
- then successive pulses on Pin 8 (LOW > HIGH) are used for data transmission (6 bits per 6 bits).
Pin binding for received data:
Bits 7 6 5 4 3 2 1 0 –-–-–-–-–-–-–-–--–-–- Pins x x 7 6 4 3 2 1