Re: Can an apple II take a C64 microprocessor?

[supertimer@aol.com (Supertimer)]

tailkinker@home.com (Tail Kinker) wrote:

>dempson@actrix.gen.nz (David Empson) wrote:
>
>>Mike Westerfield <MikeW50@aol.com> wrote:
>>
>>> You can safely put in the 65c02 or the much more powerful 65802 (assuming
>>Note that none of these instructions are compatible with the 65802 or
>
>Hmmm...what exactly is this 65802 thingy?  Also, I've heard rumours of
>the existence of a 65832...is that real or myth?

The 65C802 is a crippled 65C816 that has been made to be
pin compatible with the 65C02.  To do this, WDC had to
reduce the 24-bit address (16MB memory space) of the
65C816 to just the 64k the 65C02 can access.

The only real use for a 65C802 is to put in place of a CPU
that's normally a 65C02.

If you were designing something from the ground up, you
would want the more powerful 65C816.

The 65C832 only existed internally at WDC.  They never
put the chip into production since there was no market
for it after Apple's interest in the IIGS faded and Laser
canned the IIGS clone they were working on.  After the
IIGS, the main market for WDC CPUs is the embedded
processor market.  For this market, a moderately fast
16-bit CPU easy to program and cheap to produce
made more sense than a new whiz bang 32-bit CPU.
So instead of going with the 65C832, WDC instead
made the 65C816 better and more stable resulting in
the 14Mhz (or 20Mhz depending on how you look at
it) unit that's currently sold.