Routines
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8F9B: Controls: Kempston Joystick
Read the Kempston port and invert the bits so they match the keyboard decoder.
Output
A Controls
ReadKempstonJoystick 8F9B IN A,($1F) A=controls.
8F9D CPL Flip the bits.
8F9E RET Return.
View the equivalent code in;
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