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cc65/libsrc/cbm/c_chkin.s

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;
; Marc 'BlackJack' Rintsch, 20.03.2001
;
; unsigned char __fastcall__ cbm_k_chkin (unsigned char FN);
;
.include "cbm.inc"
.export _cbm_k_chkin
_cbm_k_chkin:
tax
jsr CHKIN
ldx #0 ; Clear high byte
bcs @NotOk
txa
@NotOk: rts