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intel 8080 アセンブラ 16bit乗算

アセンブラ
i8080

Last updated at 2017-10-02Posted at 2015-04-24

de * hl = hl

mul16:
	mov		b, h
	mov		c, l
	lxi		h, 0
mul1:
	mov		a, c
	rrc
	jnc		mul2
	dad		d
mul2:
	xra		a
	mov		a, b
	rar
	mov		b, a
	mov		a, c
	rar
	mov		c, a
	ora		b
	rz
	xra		a
	mov		a, e
	ral
	mov		e, a
	mov		a, d
	ral
	mov		d, a
	ora		e
	rz
	jmp		mul1

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