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cc65/libsrc/cx16/kbhit.s

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;
; 2019-11-06, Greg King
;
; unsigned char kbhit (void);
; /* Returns non-zero (true) if a typed character is waiting. */
;
.export _kbhit
.include "cx16.inc"
.proc _kbhit
lda KEY_COUNT ; Get number of characters
tax ; High byte of return (only its zero/nonzero ...
rts ; ... state matters)
.endproc