Chepponis@CMU-CS-C.ARPA (12/09/83)
From: Mike Chepponis <Chepponis@CMU-CS-C.ARPA> I found this book sprinkled with errors, usually in details of how the conditon codes were set. I did have an early edition, so perhaps revised editions no longer contain these errors. I finally gave the book away to a friend who (painstakingly) compared it to the Zilog Z80 CPU manual. -Mike -------
kissell@flairvax.UUCP (Kevin Kissell) (12/12/83)
The Zaks book may very well contain errors about condition flags. On the other hand, so does *every* edition of the Z80 CPU manual I've seen. These usually relate to the state of the carry flag after arithmetic operations. The behavior of the chip is more rational than the documentation suggests. I always thought that Kaite Spracklin (sp?) wrote the best of those books, but then I've never actually *used* any of these as a intro, having learned the machine before any of them were available. Kevin D. Kissell Fairchild R&D Labs, Advanced Processor Development uucp:{ucbvax!sun decvax allegra}!decwrl!flairvax!kissell