Re: 6503 ??

[david@uow.edu.au (David Wilson)]

Ronald Kneusel <rkneusel@post.its.mcw.edu> writes:
>I picked up an enhanced IIe this weekend which doesn't have a 65C02 but a
>6503.  I never heard of this chip before.  The most I found on the net
>about it says it is an 8-bit MPU made by Rockwell.  Naturally, it is a
>65C02 equivalent but does it have other features beyond those of the
>vanilla 65C02?  Additional instructions, etc. ?

If you find a 40 pin chip marked 6503 it is just an internal part number
used by Apple or its supplier for the 65C02. The real 6503 from MOS Technology,
Rockwell or other 2nd source is a 28 pin cut down version of the 6502 (4K
address range, no RDY phi1 SYNC or SO pins).
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia