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cc65/libsrc/kim1/getkey.s

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;
; int __fastcall__ getkey();
;
.include "kim1.inc"
.import popa
.export _getkey
.proc _getkey
jsr KEYIN ; Open up keyboard channel
jsr GETKEY ; Get key code
ldx #0 ; MSB of return value is zero
rts
.endproc