Kansas City standard
The Kansas City standard (abbreviated KCS) for storage of data on an ordinary audio cassette was also known as the BYTE standard or the CUTS (Processor Technology Computer Users Tape Standard).
Developed in 1975, it uses asynchronous serial data encoded using frequency shift keying such that a '0' bit is represented as 4 cycles of a 1200 Hz sine wave, and a '1' bit as 8 cycles of 2400 Hz. This gives a data rate of 300 bits per second.
Computers using the Kansas City standard included:
