From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2003-05-19 08:45:33
On Sun, May 18, 2003 at 11:15:01PM -0400, wlevak@cyberspace.org wrote:
> If the signal is not on the tape, you cannot get it off. Try an
> oscilloscope on the output from the read head. If you have signal, a
> storage scope may be able to capture it.
The signal sounds pretty much the same as it is supposed to. I think
that the number of pulses is still correct - only the times when the
pulses are triggered vary too much.
To rescue some tapes in standard format, I wrote a slightly more
error-tolerant decoder, which you can find at
http://www.funet.fi/pub/cbm/crossplatform/transfer/datassette/
as decode.pl. It's not very good, and a lot of manual postprocessing
is needed. I understand that writing anything similar for the Turbo
Tape format is more challenging, since there are only two distinct pulse
widths. The standard format uses a third pulse width for marking byte
boundaries, and it stores each data block twice.
Marko
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