(At the computer)
9 PIN D-SUB MALE at the computer.
Note: Direction is Computer relative Joystick.
Warning: Pin 5 is +5V on MSX and Mouse Button 2 on Amiga. Since Amiga mousebutton is active low, connecting an Amiga mouse to a MSX and pressing mousebutton 2 will shortcut the supply voltage.
Source: [The Hardware Book]