Date   : Sun, 22 Apr 1990 03:00:15 EDT
From   : dg%pallio.UUCP@XAIT.Xerox.COM (David Goodenough)
Subject: Z80 Users Manual bugs

wayne.hortensiu@canremote.uucp says:
> I say:
>> I then dug out "The gospel according to Carr" (The Z80 user's manual,
>> by Joseph Carr, ISBN 0-8359-9516-X ) - It has the following table for
>> what happens in a DAA.
> 
> I'd be *REAL* careful about relying on the Carr book for much of
> anything - *ESPECIALLY* the DAA instruction. I got bit by one of the
> many, many typos and just plain errors in this book once upon a time,
> and it took me a long while to figure out that I wasn't doing anything
> wrong - it was the book!

I've had my suspicions about the book - it does have it's typos. My own
worst complaint is that there is _NO_ reference anywhere to instruction
timing: how many T states and how many M cycles does a particular
instruction take? Still, that can be taken from Zilog's own Z80 data
sheet. I suppose that one day I'll have to write up something for the
Z80, based on how the CPU in my system here works ....... one day .....
-- 
       dg@pallio.UUCP - David Goodenough               +---+
                                               IHS     | +-+-+
       ..... !harvard!xait!pallio!dg                   +-+-+ |
AKA:   dg%pallio.uucp@xait.xerox.com                     +---+


End of INFO-CPM Digest V90 Issue #72
************************************