"Spectrum Software is a software company based in California, whose main focus is electrical simulation and analysis tools, most notably the circuit simulator Micro-Cap. It was founded in February 1980 by Andy Thompson. Initially, the company concentrated on providing software for Apple II systems.One of the earliest products was Logic Designer and Simulator. Released in June 1980, this product was the first integrated circuit editor and logic simulation system available for personal computers."@en . "Spectrum Software"@en . . "1980Z"^^ . . . . . .