Abstract: A control system for the selection and storage of each phonograph record side to be played in a coin-operated juke box having a storage and credit mechanism. A microcomputer operating as a process computer has a number of inputs and outputs limited to a minimum by series-type runs. The microcomputer has a central computer unit, a set-value storage, and a write/read storage with selective access. The microcomputer unit, furthermore, is coupled with a clock or timing generator connected to a BCD for 1 out of 10 decoder, to a BCD for 7-segment decoder, to a BCD for 1 out of 16 decoder, and via these decoders to level converters with series-connected output units and input circuits in the form of a coding table, keyboard, input switch and coin switch.