The purpose of this interface is to use high transfer rates for compact cassettes which are used with the XC12 Datasette. The roots are about 10 years ago, in Eastern Germany it was unimaginable expensive to buy a floppy station. Thatswhy the people searched for other ways because they were not satisfied with the slow original Datasette. The whole system was called "CHAOS SYSTEM" and it uses 6000 Baud for data transfers. Just build the small interface into the XC12 and you're ready to go.
The structure of the files is much the same like for diskette files. To run the software the files on cassette must be loaded with the "CHAOS LOADER". For copy purposes the "CHAOS COPY" has to be used. Both can be loaded either by a cartridge or as a normal cassette file: put the compact cassette into the XC12, boot Atari up with OPTION+START pressed, press PLAY on Datasette and then SPACEBAR on the Atari keyboard.
After the "CHAOS LOADER" started put in your Turbo Software cassette and press PLAY. If a suitable file is found the "CHAOS LOADER" displays its name on the screen. Press SPACEBAR to load it or RESET for searching the next. After loading the file it will be started. With "CHAOS COPY" you can copy Turbo Software, not much to say.
There are several utilities to transfer files between normal cassette and turbo system or floppy station and turbo system:
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