Re: Enhanced //e with a 6503??!

[Eric Smith <eric@brouhaha.com>]

"BLuRry" <brendan.robert@gmail.com> writes:
> Odd.  According to this website, it was a custom 65c02...  This makes
> no sense to me.
> 
> http://www.cpu-world.com/CPUs/650x/Rockwell-338-6503%20(65C02).html
> 
> Surely there must be something different between this custom chip and a
> stock 65c02.  My injured zip chip is seemingly much more compatible
> than this thing.

Probably functionally and electrically identical to a standard
R65C02, and just "house numbered" with Apple's 338-6503 part number.

Big customers can get their own part numbers "house numbered" on
parts direct from the manufacturer; this was always seen in HP
equipment, where a lot of standard digital chips including TTL and
CMOS parts had 1810-xxxx part numbers.

That Apple chose "338-6503" as their part number is somewhat confusing,
but I suppose not too surprising since they used "338-6502" for the
original NMOS part.  Apple's numbering system uses a three digit
class and four digit specific part code, so they couldn't stick a "C"
in the middle even if they dropped a digit to make room.