MFM is also pretty crappy encoding when you're limited by bandwidth
rather than dynamic range. Tape is better than the phone lines in
many ways, although distortion is a problem; linear stretching appears
as a slow drift of the master clock and shouldn't be a significant
problem if you keep it in mind while writing the decode algorithm,
Furthermore, 8bit micros *never* used any form of ECC, usually a
16-bit CRC or checksum over the blocks was all that was ever used.
With QAM or Trellis, I wouldn't be surprised if you could get 16-32
kbps with a decent audio deck.
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