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Modula-2 is a computer programming language invented by Niklaus Wirth at ETH around 1978, as a successor to Modula, an intermediate language by him. Modula-2 was implemented in 1980 for the Lilith computer, commercialized in 1982 by startup company DISER (Data-Image-Sound-Processor-and Emitter-Receiver-System) as MC1 and MC2. DISER sold 120 units worldwide. The Modula-2 language is loosely based upon the Mesa programming language, from Xerox, that Wirth saw during his 1976 sabbatical year at Xerox PARC.