Re: Difference between 6502 & 65C02

[aplworks@crl.com (Chet Gerhardt)]

John Bowling (johnlb@primenet.com) wrote:
: In article <96082.140914JCA31@maine.maine.edu>,  <JCA31@MAINE.MAINE.EDU> wrote:
: >I'd like to know what it is that's different between these two cpu's,
: >apart from one being a CMOS chip. I'm also curious as to why I my II+
: >'sort-of' works with a 'C02 in it. I'd think that the machine would
: >either run, or crash miserably, but instead, it just seems to have
: >trouble keeping track of numbers ..?something to do with operating
: >modes, maybe?
: >
: A 65C02 will work in place of a 6502 unless you are running code that has 
: used 'undocumented' operations in the 6502.  Some of those undocumented 
: operations were used as part of copy protection as well as trick code.
: If the code is ALL standard 6502 code, you should not have a problem.

: Several new op codes were put into the 65C02, which improve it's operation.

: There is another possible problem:  Not all 65C02s are the same.  
: Rockwell created their own 65C02 with a series of bit operators which are 
: not part of any other manufacture's 65C02.
: --
: ------------------------------------------------------------------------------
: John Bowling             |Apple II GS can whip the pants off its little
: johnlb@primenet.com      |brother (Mac) any time!
: ------------------------------------------------------------------------------

OK, How about a 6503 (I got one in a Platinum IIe a while back)?  A 
Friend and I were chatting about this, what is the difference between a 
6503, a 65c02 and a 6502? :)

Chet