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From: notes@isucs1.UUCP
Newsgroups: net.micro.apple
Subject: Re: Putting a 65C02 cpu in an Apple II+
Message-ID: <511@isucs1.UUCP>
Date: Thu, 6-Feb-86 11:10:25 EST
Article-I.D.: isucs1.511
Posted: Thu Feb  6 11:10:25 1986
Date-Received: Sun, 9-Feb-86 08:06:48 EST
Sender: notes@isucs1.UUCP
Organization: Iowa State University
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Nf-ID: #R:myrias:-21300:isucs1:9900015:000:2551
Nf-From: isucs1!heins    Feb  6 03:49:00 1986

/***** isucs1:net.micro.apple / myrias!sjl /  8:39 pm  Feb  4, 1986 */
>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?

The Apple //c and enhanced //e use the NCR version of the 65C022
which does not have all of the instructions that the Rockwell version
does.  I have heard of some compatability problems with the Rockwell chips
in Apple //'s, but that may be only with older versions of that chip.

The only assemblers that I know of that support the extended instructions
of the 65C02 are ORCA/M by the BitWorks, Merlin by Roger Wagner publishing,
Big Mac, by A.P.P.L.E. (the user group)  None of these run under Pascal...

I also assume that you mean Apple Pascal 1.2.... as far as I know the most
recent version of Apple Pascal is 1.3, which runs under ProDOS, perhaps this
version with the ProDOS version of ORCA/M (an _awesome_ assembler) would
solve your problem.

		   "I am not affiliated with anyone in particular so sue
		   me alone (if you can get blood out of a turnip) but
		   leave my UNIX site alone - disclaimer}"
		   
		   Lee Heins
		   /* ---------- */