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Path: utzoo!utcsri!ubc-vision!alberta!myrias!sjl
From: sjl@myrias.UUCP (Stuart Lomas)
Newsgroups: net.micro.apple
Subject: Putting a 65C02 cpu in an Apple II+
Message-ID: <213@myrias.UUCP>
Date: Wed, 29-Jan-86 19:28:46 EST
Article-I.D.: myrias.213
Posted: Wed Jan 29 19:28:46 1986
Date-Received: Wed, 29-Jan-86 21:25:41 EST
Organization: Myrias Research, Edmonton
Lines: 34

While visiting my local components dealer yesterday, I noticed a
Rockwell R65C02P1 microprocessor on the shelf. The data sheet says
that it is software and pinout compatible with the standard NMOS
6502, the only differences being lower power consumption and an
extended instruction set. Feeling brave, I plunked down my C$12.19,
bought the chip, and plugged it into my 5 year old Apple II+. It
seems to work - that is, Apple Pascal 2.1 runs just fine.

Now for some questions:

   - Has anyone else out there tried this? Any problems?

   - I assume that this is the same chip as is found in the Apple //c.
     However, the data sheet for my chip describes a whole series of
     instructions that do not appear in the //c reference manual,
     specifically:

	SMB[0-7] (Set Memory Bit 0-7, 8 opcodes)
	RMB[0-7] (Reset Memory Bit)
	BBS[0-7] (Branch on Bit Set)
	BBR[0-7] (Branch on Bit Reset)

     There may be some other inconsistencies - I didn't have both
     sheets to compare. A whole variety of other instructions (PHX,
     PHY, LDA (ind), BRA, etc) appear in both the data sheet and //c
     reference manual.

     So, do I have the same chip as the Apple //e?

   - Currently, I do all of my assembler programming using the Apple
     Pascal 2.1 assembler, which is nice because I can link assembler
     subroutines to my Pascal programs. Does anyone know of an assembler
     that runs under Pascal 2.1 and assembes the 65C02 opcodes and
     extended addressing modes?