Re: Apple III info wanted

[ddoms@tyrell.net (Dennis Doms)]

In article <3lhvtt$fvv@vixen.cso.uiuc.edu>, jd-wong@uxa.cso.uiuc.edu (Jim
Wong) wrote:

> How does "extended addressing capability" work?

I believe (if I remember correctly from the _Softalk_ article; it's been a
few years :) that they trapped _unimplemented_ instructions from the 6502
instruction set. (That is, not all 256 possible opcodes actually were
implemented [successfully?] for the 6502, so they could use an
"unimplemented" opcode and external logic to trap and execute an "extended
address" operation.)

-- 
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Dennis Doms     | "Into this night I wander, it's morning that I dread
ddoms@tyrell.net|  Another day of knowing of the path I fear to tread..."
                | Sarah McLachlan ("Possession", _Fumbling Toward Ecstasy_)