An electronic interface for the Commodore 64 microcomputer suitable for generation of voltammetric waveforms and for data acquisition has been built. Used together with analogue voltammetric instruments the interface makes updating of the measurement techniques possible. Also, fast A/D-conversion and a floppy disk drive make the system useful as a universal data-acquisition unit in the laboratory. The system has been tested together with an amperometric detector in the square-wave voltammetric determination of paracetamol and iodide.