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cc65/libsrc/cbm610/kbhit.s

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;
; Ullrich von Bassewitz, 06.08.1998
;
; int kbhit (void);
;
.export _kbhit
.import return0, return1
.import keyidx: zp
.proc _kbhit
lda keyidx ; Get number of characters
bne L1
jmp return0
L1: jmp return1
.endproc