Fwd: unknown data tape

[John Foust]

At 11:38 AM 12/11/2005, Allison wrote:
> What's
>>odd to my ear is that the data seems to be packeted between
>>carrier.  Might this be someone's custom data, as opposed to
>>ordinary program load/save?
>
>No and yes.  Most of the cassette schemes were either FM or FSK
>and both required a carrier to establish sync before the data.
>there were a quite a few modulation schemes but they can be
>described as either frequency shift keyed or phase shift keyed
>and in some ways similar. 

Yes, but as my message stated, and as you can hear in the
audio sample the sender provided, this tape has carrier between
packets of data, every few seconds.  I'm familiar with sync
tone before a long block of data, but not this case.

- John