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From: graeme@labtam.labtam.oz (Graeme Gill)
Newsgroups: comp.arch
Subject: Re: Zilog's mnemonics; a boon to programmers
Summary: + Zilog provided some nice charts
Message-ID: <5584@labtam.labtam.oz>
Date: 16 Nov 90 00:24:27 GMT
References: <1990Nov4.014901.23819@zoo.toronto.edu> <3747@skye.ed.ac.uk>
Organization: Labtam Information Systems Pty. Ltd., Melbourne, Australia
Lines: 18

In article <3747@skye.ed.ac.uk>, richard@aiai.ed.ac.uk (Richard Tobin) writes:
> In article <1768@metaphor.Metaphor.COM> djh@neuromancer.metaphor.com (Dallas J. Hodgson) writes:
> >Ahem, excuse me, but Zilog's mnemonics were readable and orthogonal in a way
> >that Intel's never were
> 
> Quite true.  The problem was that the orthogonality of the mnemonics
> led one to write instructions that didn't in fact exist.
> 

	and this took a little while to learn, but was made easier thanks to
some really useful charts showing the legal combinations of mnemonics
and registers, together with the op codes in the Zilog data book. Made had
assembly pretty easy too.
	One thing that drove me nuts about the 8086 was the lack of any
comparable aid in charting out its non-orthagonalities, and legal addressing/
register combinations.

	Graeme Gill