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It seems difficult to find any detailed technical information online for the 85xx chips used in later Commodore 8-bit computers. For example, there's an excellent archive at http://www.6502.org/documents/datasheets/mos/ with datasheets for 65xx chips, but not the 85xx versions.

Is there some repository I've failed to locate that has the datasheets I need?

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  • I’d suspect bitsavers has it tucked away somewhere, but haven’t time to check right now…
    – Jon Custer
    Mar 30 at 16:43
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    OK, bitsavers only has the 1982 MOS Technologies data book, which does not have 85xx chips.
    – Jon Custer
    Mar 30 at 19:13

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