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  • cassette interface data format?

    From Benjamin Ketcham@bketcham@drizzle.com to comp.sys.apple2 on Wednesday, October 06, 2004 02:08:32
    From Newsgroup: comp.sys.apple2

    Hello, all. Apologies if the info I'm seeking is in an FAQ somewhere:
    so far, I've found little that helps.

    I want to know about the data format used in the Apple cassette
    interface (][+, specifically). All I "know" so far is that L is
    one cycle of 2kHz, H is one cycle of 1kHz. But actual output from
    the Apple seems to be fairly far off from that; and there seems to
    be some amount of framing (start/stop bits? parity? CRC?), which I
    have not figured out yet. I'd appreciate any more complete info.

    BTW, the reason is so that I can build a data loader based on a
    PIC processor (for operating the Apple without disk drives).

    --Benjamin

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