Re: [stella] Difference between 6507 and 6502

["Roger Williams" <mer02@xxxxxxxxxxxxx>]

 

Can anyone tell the difference between a 6507 and a 6502 apart from the missing pins? Are both cores 100% identical including any non documented opcodes?

Yes, they are identical.  The 6507 package was created strictly

to save space on the PCB, in those days it did not make sense

to create a new die and mask for such an "improvement" since this

was much more expensive than the package design.  The 6507 in

a 2600 should react the same way to undocumented opcodes as the

6502 in a C64.

 

--Roger Williams