Re: 65C816 adapter for 6502 computers (aka Apple II)

["Vince Briel" <vbrielnospamme@comcast.net>]

>     You win!!  I am curious.  Do you own "Understanding an Apple II+ &
Apple
> //e" manuals?  Please tell me how did you make 65C02 and 65816 CPU to work
> with Apple II+?  Did you plug 65816 CPU into Apple II+'s motherboard
> already?  The problem is that Apple II+'s ROM must be located in Bank $FF
> because it is where $FFFC is pointing in Bank $FF.
>

This is not my project, it's Daryl Rictor's. The tests they have done are on
older systems like the Oric. I'll gladly test one on my replica 1 and Apple
II plus. Board runs haven't been done yet and this is still a work in
progress. I assume when you refer to $FFFC you are referring to the reset
location that the 6502 jumps to on a reset cycle? This is the same across
the 6502, 65C02 and 65816. I'm getting a couple of these board and trying
them out. A 65C02 is essentially a 6502 with improvements such as added
instructions, lower power draw, and other features and can't think of off
the top of my head. The 65C02 is a straight drop in replacement for the 6502
but you shouldn't need to swap those out unless you require the added
enhanced instruction set of the 65C02 for some reason.

No, I don't own "Understanding an Apple II+ & Apple //e manuals". I sold off
my //e some time ago and now I'm left with my many II+ computers. Keep in
mind the adapter Daryl developed is still in its early stages and not all
machines have been tested. This is why he is looking for people to get
together and order a run of boards. You then must get the components and
solder them on this tiny board (IC's are SMD and require a reflow oven or
other method).

Cheers,

Vince

--
Replica I
The Apple I clone

http://www.applefritter.com/apple1/members/replica1/index.htm