http://www.nationalamiga.com/t-JoyPort.html (Amiga Plus Extra No. 5/97, 05/1997)
DB9 Mouse/Joystick Connectors
Amiga Mouse/Joystick/Lightpen Ports
DB 9-pin Male
If Port Is Used As Mouse/Trackball
Pin Mnemonic Description
1 V Vertical pulses
2 H Horizontal pulses
3 VQ Vertical quadrature pulses
4 HQ Horizontal quadrature pulses
5 UBUT* Unused mouse button (middle)
6 LBUT* Left button
7 +5V +5V, current limited
8 Ground
9 RBUT* Right mouse button
If Port Is Used As Joystick
Pin Mnemonic Description
1 FORWARD* Forward joystick switch
2 BACK* Back joystick switch
3 LEFT* Left joystick switch
4 RIGHT* Right joystick switch
5 Unused
6 FIRE* Left mouse button
7 +5V 125ma max, 200ma surge
8 Ground
9 Unused
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