cassette interface adaption

For an ordinary cassette tape to be used as long term memory with the Elektor BASIC microcomputer a special cassette interface will have to be used. An example of this was published in the May 1980 issue of Elektor. The difference between the special and the ordinary kinds of cassette-interface aren"t so great that the latter type can not be adapted. The small addition required is described here and involves no modification to the existing system. Most interfaces operate on the FSK method according to the Kansas City Standard. With the aid of a device which makes the BASIC micro- computer stop for a certain period of time at the end of each line, virtually any cassette-interface can be used. When the microcomputer is being programmed, a prompt automatically appears at the beginning of each line. This is generated by the com- puter in response to the CR (carriage return) at the end of every line. There is plenty of time for generating these prompts when a program is being entered b...