Computer Audio Tape Formats

From: tim lindner <>
Date: Tue Dec 17 15:54:00 2002

I am looking for information regarding how various computers wrote
information to audio tapes.

For example, the Tandy Color Computer wrote ones and zeros to audio tape
in the following format:

'one bit': one sinusoidal cycle _at_ 2400 Hertz.
'zero bit': one sinusoidal cycle _at_ 1200 Hertz.

The bit rate is variable on a CoCo tape. But averages to about 1500 bits
per second.

I am contemplating creating an audio tape anaylzer to help me recover
some data. I would like to make the program useful to thoes outside the
Color Computer community. But first I need to understand all of the
different methods used to put data on audio tape.

tim lindner          
Received on Tue Dec 17 2002 - 15:54:00 GMT

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