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Amstari

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Cool! Thanks for sharing those dumps!

By looking at the waveform (I used Audacity), you can figure out how the data is stored. 2 tones are used to record the binary data:
- 1 cycle of a sinewave at about 1300 Hz
- 2 cycles of sinewave at about 2600 Hz

Assuming that the lower freq corresponds to a '0' and the higher one to a '1' bit, the data format is the following:

1 '0' start bit (green)
8 data bits (gray - we don't know if they are sent from least to most significant bit or the other way around)
4 '1' stop bits (red).

 

post-10599-0-54243700-1455637221_thumb.png

 

The first about 10 seconds on each track is probably an header to sync the software in the compumate with the cassette. It follows the same format described above, but all the data bits are '1'.
In this picture you can see a detail of the end of the header and the beginning of the actual data.
post-10599-0-55807400-1455637236_thumb.png

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Cool! Thanks for sharing those dumps!

 

By looking at the waveform (I used Audacity), you can figure out how the data is stored. 2 tones are used to record the binary data:

- 1 cycle of a sinewave at about 1300 Hz

- 2 cycles of sinewave at about 2600 Hz

 

Assuming that the lower freq corresponds to a '0' and the higher one to a '1' bit, the data format is the following:

 

1 '0' start bit (green)

8 data bits (gray - we don't know if they are sent from least to most significant bit or the other way around)

4 '1' stop bits (red).

 

attachicon.gifdata_format.png

 

The first about 10 seconds on each track is probably an header to sync the software in the compumate with the cassette. It follows the same format described above, but all the data bits are '1'.

In this picture you can see a detail of the end of the header and the beginning of the actual data.

attachicon.gifheader.png

 

 

Someone should convert these images to binary. ;)

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That's cool, Toymailman!

 

If possible, would you be able to do the same for Songmate? The dump we have now is mp3, and if it's dumped in .wav it is much better.

Done! The tracks are uploaded in my next posts.

 

Cool! Thanks for sharing those dumps!

No problem and glad to help. That is some cool work you did in decoding the files!

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