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cc65/libsrc/cbm/c_ckout.s

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;
; Ullrich von Bassewitz, 03.06.1999
;
; unsigned char __fastcall__ cbm_k_ckout (unsigned char FN);
;
.export _cbm_k_ckout
.import CKOUT
_cbm_k_ckout:
tax
jsr CKOUT
bcs @NotOk
lda #0
@NotOk: rts