Date   : Thu, 04 Jan 1996 20:58:00 +0000 (GMT)
From   : James Fidell <james@...>
Subject: Re: Timings for 65c[01]2 NOP instructions

Angus Duggan wrote:

> There is only one "official" NOP for the 65c02, which is &EA, and
> is one byte. The spare instructions are quite free to do different
> things for each manufacturer's implementation of the processor (and
> did differ between the Rockwell and Motorola 6502 implementations).

Which, I am afraid, just leads to more questions...

I thought that all the unused 65c02 opcodes were supposed to be NOPs ?
Was that only the 65c12 ?
What did the unused op-codes *actually* do on the Rockwell and Motorola
65c02 chips (I didn't even realise that Motorola made a CMOS version) ?

James.
-- 
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