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cc65/libsrc/plus4/kbhit.s
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ArmAsm

;
; Ullrich von Bassewitz, 06.08.1998
;
; int kbhit (void);
;
.export _kbhit
.import return0, return1
.include "plus4.inc"
_kbhit:
lda KEY_COUNT ; Get number of characters
ora FKEY_COUNT ; Or with number of chars from function keys
bne L1
jmp return0
L1: jmp return1