Routines
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B0FA: Controls: Keyboard
Used by the routine at HandlerControls.
Output
C Keyboard controls
ReadKeyboard B0FA LD A,$FB Read from the keyboard;
Port Number Bit
0 1 2 3 4
FB Q W E R T
B0FC OUT ($FD),A
B0FE IN A,($FE)
B100 CPL Flip the bits.
B101 LD C,A C=A.
B102 RET Return.
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