staxspi.s

;
; Ullrich von Bassewitz, 26.10.2000
;
; CC65 runtime: Store a/x indirect into address at top of stack with index
;

       	.export		staxspidx
	.import		incsp2
	.importzp	sp, tmp1, ptr1

.proc	staxspidx

  	sty	tmp1		; Save Y
  	pha			; Save A
  	ldy	#1
  	lda	(sp),y
  	sta	ptr1+1
  	dey
  	lda	(sp),y
  	sta	ptr1		; Address now in ptr1
  	ldy	tmp1		; Restore Y
  	iny			; Address high byte
  	txa			; Get high byte
  	sta	(ptr1),y	; Store high byte
  	dey			; Address low byte
  	pla			; Restore low byte into A
  	sta	(ptr1),y	; Store low byte
  	jmp	incsp2		; Drop address

.endproc

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