On Mon, 13 Feb 2006, Alan B. Pearce wrote:

>> It would have to be 9-track to fix the registration
>> problem. It is easier to implement a self-clocked one
>> track protocol. That's why 9-tracks are dead.
>
> Are you referring to 9 track 800/1600BPI tape? If so then the 1600BPI NRZI
> tapes were certainly self clocking on each track, and could deal with quite
> reasonable skew between tracks without errors because of this.
>
> Alan (who used to repair 1600BPI controllers).

I was referring to soemthing like 5-track + clock (registration?) paper 
tape.

Peter
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