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Copyright 1991 David Jurgens |
Joystick / Game Port (201h)
│7│6│5│4│3│2│1│0│ Port at 201h used with Joysticks
│ │ │ │ │ │ │ └──── joystick a, x coord (0 = timing active)
│ │ │ │ │ │ └───── joystick a, y coord (0 = timing active)
│ │ │ │ │ └────── joystick b, x coord (0 = timing active)
│ │ │ │ └─────── joystick b, y coord (0 = timing active)
│ │ │ └──────── joystick a, button 1 (0=pressed)
│ │ └───────── joystick a, button 2 (0=pressed)
│ └────────── joystick b, button 1 (0=pressed)
└─────────── joystick b, button 2 (0=pressed)
│7│6│5│4│3│2│1│0│ Port at 201h used with Paddles
│ │ │ │ │ │ │ └──── paddle a coord (0 = timing active)
│ │ │ │ │ │ └───── paddle b coord (0 = timing active)
│ │ │ │ │ └────── paddle c coord (0 = timing active)
│ │ │ │ └─────── paddle d coord (0 = timing active)
│ │ │ └──────── paddle a, button (0=pressed)
│ │ └───────── paddle b, button (0=pressed)
│ └────────── paddle c, button (0=pressed)
└─────────── paddle d, button (0=pressed)
- accessed through port 201h
- bits 3-0 are resistive inputs with the length of the pulse
determined by 0-100K ohm resistive load. Use this formula:
time = 24.2μ + ( 0.011μ * resistance )
or
resistance = ( time - 24.2 ) / 0.011
- a read should be immediately preceded by a write (any data)
to start timing for the resistive values.
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| Esc or Alt-X to exit |
game port |
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