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  • Looking for Checkmate "CPU port" card (65816) or Applied Engineering 65

    From Ralph Hyre@21:1/5 to All on Tue Jun 25 16:58:11 2024
    There were a few folks using these back before the Apple //gs was
    shipping, but I haven't seen one for sale on ebay recently.

    These were cards which supported replacing the 65c02 in the Apple //e
    with a 65816 processor, but with no other //gs features.

    Any leads appreciated

    - Ralph Hyre

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  • From Michael J. Mahon@21:1/5 to Ralph Hyre on Wed Jul 17 23:04:14 2024
    On 6/25/2024 1:58 PM, Ralph Hyre wrote:
    There were a few folks using these back before the Apple //gs was
    shipping, but I haven't seen one for sale on ebay recently.

    These were cards which supported replacing the 65c02 in the Apple //e
    with a 65816 processor, but with no other //gs features.

    Any leads appreciated

    - Ralph Hyre

    Another somewhat simpler approach is to find a 65802 processor--an 8-bit interface 65816 in a package with pinout compatible with the 6502.

    They used to be medium available, but are now pretty rare.
    --

    -michael

    NadaNet 3.1 for Apple II parallel computing!
    Home page: http://michaeljmahon.com

    "The wastebasket is our most important design
    tool--and it's seriously underused."

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  • From Andrew Roughan@21:1/5 to Ralph Hyre on Fri Jul 19 00:28:20 2024
    On 6/25/2024 1:58 PM, Ralph Hyre wrote:
    These were cards which supported replacing the 65c02 in the Apple //e
    with a 65816 processor, but with no other //gs features.

    I used a 65816 in my platinum //e without an adapter for many years. Yes,
    the pin outs don’t match completely, but it worked.

    A2Heaven have a 65C816 -> 65C02 board for $35

    Regards
    Andrew

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