Re: Apple III info wanted

[dempson@atlantis.actrix.gen.nz (David Empson)]

In article <3lhvtt$fvv@vixen.cso.uiuc.edu>,
Jim Wong <jd-wong@uxa.cso.uiuc.edu> wrote:
> gbohling@herbie.unl.edu (Tiresias) writes:
> >"Processor: Based on the 6502B microprocessor, with extended addressing
> >	    capability
> 
> How does "extended addressing capability" work?

I don't know exactly.  It is implemented by extra hardware that
monitors the operation of the processor.  I believe it involves
extensions to some addressing modes.

One that I remember hearing about (many years ago, so I may have the
details wrong) is that (indirect,Y) instructions in a certain range of
zero page addresses will fetch a third address byte.


Any Apple III programmers out there?
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand