Pinout for SED9421

[lee davison]

> Figures..  However they loose a full sector for every four
> which is pretty bad considering sync and other overhead that
> floppies incur.

It's not that clever. One 2K block of data per track, no sectors,
no sync, just the 125Kb/s async bitstream. Wait for the index
pulse and read/write the whole track. At the time it was a lot
cheaper than any other disk controller.

Lee.











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