Path: utzoo!attcan!uunet!mcsun!unido!altger!snoopy
From: snoopy@altger.UUCP (Mathias Niemz)
Newsgroups: comp.os.cpm
Subject: Division by Z80
Keywords: z80, division
Message-ID: <1946@altger.UUCP>
Date: 21 Oct 89 11:53:26 GMT
Organization: Altos Computer Systems Munich
Lines: 32


Someone was looking for multiplikation/division with a Z80. Here is a
routine for a 16-bit-division:

.z80
;
; in: bc=divisor de=divident
; out: bc unveraendert, de=rest, hl=quotient
;
divi:
	ld	bc,111h
	ld	de,7000h	; 7000/111= ????
	xor a
	ld	h,a
	ld	l,a
	ld	a,16
dloop:	rl	e
	rl	d
	adc	hl,hl
	sbc	hl,bc
	jr	nc,diffok
	add	hl,bc
diffok:	ccf
	dec	a
	jr	nz,dloop
	rst	38h
	end
-- 
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