12 Dec
2005
12 Dec
'05
3:46 p.m.
At 11:38 AM 12/11/2005, Allison wrote:
What's
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
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.