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28592: Controls: Kempston Joystick
Used by the routine at ReadControls.
Reads the Kempston joystick. The bits are flipped so that they are the same as those which are returned by ReadControls.
Output
A The controls (see ReadControls)
ReadKempstonJoystick 28592 IN A,(31) Fetch the state of the Kempston joystick.
28594 CPL Flip the bits, to match the keyboard (a zero bit means pressed).
28595 RET Return.
View the equivalent code in;
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