Routines
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45306: Controls: Keyboard
Used by the routine at HandlerControls.
Output
C Keyboard controls
ReadKeyboard 45306 LD A,251 Read from the keyboard;
Port Number Bit
0 1 2 3 4
251 Q W E R T
45308 OUT (253),A
45310 IN A,(254)
45312 CPL Flip the bits.
45313 LD C,A C=A.
45314 RET Return.
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