The next extension is to track the tachometer values so that you can detect and 
compensate for tape stick/drag
which is absolutely critical for formats that don't self-clock, like NRZI.

Fortunately, they mention that the tapes they worked with were in good 

The killer problem with the Qualstar is the reel motors are low torque. If you 
get a sticky tape, the RPMs go wonky.

Good news is the Saleae 16 can do digital and analog capture.

On 3/10/17 10:22 AM, Paul Koning via cctalk wrote:

> The software mentioned in the article sounds very interesting.  It talks 
> about starting with digital data streams from the 9 heads, but adds that you 
> can start with analog data too.  That would be a small change: you'd 
> basically have to add the slicer in software.  That's potentially valuable, 
> if the signals are marginal so the threshold needs to adjust on the fly.
> Obviously this can also be adapted to other tape formats, for example 7 track 
> tapes.  Or esoteric stuff like 10 track tapes.
> Thanks for that link!
>       paul

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