Re: Difference between 6502 & 65C02

[jkeim@unlinfo.unl.edu (james keim)]

John Bowling (johnlb@primenet.com) wrote:

: I don't have any reference books on these anymore, but from what I recall 
: there were a half dozen processors between 6501 and 6510, and the primary 
: differences were the number of pins and how much memory they addressed.  
: A few may have contained internal RAM/ROM.  It doesn't seem like a 6503 
: would be software compatable with the IIe (designed years before the 
: 65C02, as were all 65xx processors [without the C]) so it was probably a 40 
: pin 6502 with internal RAM/ROM.  Possibly used because Apple found a 
: bunch of them surplus and wanted to save some money. 

: It can't be 65C02 compatable unless it was designated a 65C03, and I 
: don't recall ever hearing about such a chip.

: John


John-- 

There was some discussion of this some time ago on Genie.  I don't
remember all the details but I think the kernel of the discussion was
that one company started calling their 65c02 a 6503--probably just to 
make things a little confusing.  As I remember, they are basically the
same chip.

Harold Hislop would know for sure if he is anywhere around.  I'm sure
he was one of the principle parties discussing this chip.

--James Keim