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Thread: 6502 vs 65C02

  1. #1
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    Default 6502 vs 65C02

    So I was taking apart another Apple IIc I was restoring and to my surprise the unit came with a Zip 4000 4mhz upgrade cpu.. definitely going to keep that. Problem is the logic board needs a 65C02 cpu and I don't have any. I know there are 6502 variants like the C64 6510 cpu.

    I want to get this unit back to stock; will a standard 6502 cpu work? I looked on ebay to get an idea and all I seem to find are R65C02P4 and R65C02P2. Will these work in the apple IIc? I have no idea the preceeding "R" or what P2 or P4 means either. Could use some input, thanks

    Mick

  2. #2

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    I believe the R is for Rockwell. It would also have the Rockwell symbol on it. You'd need to check a Rockwell catalog to find what the other stuff means.
    Dwight

  3. #3
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    The IIc came with a 65c02 and most software of that era using ProDOS requires it. The ROM may not even run with a regular 6502.

    Also, the ZIP chip will only work with 65c02 since it is 4MHz. The plain 6502 was only ever made up to 2MHz as far I know.

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    Will a WDC W65C02S work?

  5. #5
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    Quote Originally Posted by Chuck(G) View Post
    Will a WDC W65C02S work?
    Yes, it should work fine.

  6. #6
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    It seems that the only speed rating of the WDC chip selling is 14MHz, so there should be plenty of room for experimentation.

  7. #7
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    Well Chuck I guess I can try that out. Will these work? https://www.ebay.com/itm/5pcs-W65C02...0AAOSwMmBVvFMZ

    I suppose if it passes Diags thats good enough for me.

  8. #8
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    10MHz should be okay and you'll have 4 spares.

  9. #9
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    The WDC *may* have a little problem.. there are some minor differences between the modern WDC part and older (e.g. Rockewell) 65c02, particularly pin 1. Here's a link to WDC's explanationary page: http://www.westerndesigncenter.com/w...placements.cfm

    Or get an R65C02P2 (or P4 - I believe they are 2MHz and 4MHz respectively) from a reputable source, e.g. utsource.

    WARNING! Do *not* buy WDC from that ebay source. They came up on 6502.org a while ago, they are selling fakes.
    WDC chips are in production. Buy from a real dealer, e.g. Mouser.

  10. #10
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    Quote Originally Posted by Tor View Post
    WARNING! Do *not* buy WDC from that ebay source.
    Too late..I bought last night.
    anyway the seller has a 60 day return on the items. IF they dont work I will file a claim. It will be annoying but par for the course at this point.

    I buy lots of components on ebay from foreign sellers.... why?
    1.) so much cheaper than American retail outlets (online) [ better quality? no I'm sure its inferior,, but this is a hobby of course and funds being what they are..]
    2.) there are no retail component selling chains anywhere near me I am aware of.. There is no Frys, Radioshack is gone (and wasnt much use in the end anyway) Online is my only choice.
    3.0 yes waiting 30-45 days for delivery from china is terrible, but for the price who cares.

    It works out more then it impedes the hobby.

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