From: utzoo!decvax!decwrl!sun!megatest!fortune!hpda!hplabs!sri-unix!CC.Otken@utexas-20.arpa
Newsgroups: net.micro.cpm
Title: Subroutine to test for Z80 or 8080.
Article-I.D.: sri-arpa.1348
Posted: Tue May 10 07:43:00 1983
Received: Fri May 13 04:00:29 1983

From:  John Otken <CC.Otken@utexas-20.arpa>

Quite a few people seem to be writing Z80 only code these days which
could be bad news to some 8080/8085 CPUs.  Well, here is a subroutine
which exploits the subtle differences in 8080s and Z80s.

;;	Z80 - Test for Z80 CPU.
;
;	exit:	(Zf) = set if Z80 processor
;			BC, DE, HL unchanged
;
Z80	xra	a		; Clear parity flag
	ori	80h
	adi	81h		; Clear zero, set parity if Z80
	jpo	Z801		;   if 8080/8085
	xra	a		; Set zero
Z801	ret

A version of this might have gotten out with a typo in the ADI instr.
Ignore it, this one is right.
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