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cc65/libsrc/cbm/c_save.s

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;
; Marc 'BlackJack' Rintsch, 11.06.1999
;
; unsigned char __fastcall__ cbm_k_save(unsigned int start, unsigned int end);
;
.export _cbm_k_save
.import SAVE
.import popax
.importzp ptr1, tmp1
_cbm_k_save:
sta tmp1 ; store end address
stx tmp1+1
jsr popax ; pop start address
sta ptr1
stx ptr1+1
lda #ptr1
ldx tmp1
ldy tmp1+1
jsr SAVE
bcs @NotOk
lda #0
@NotOk: rts