After the Tymshare diaspora, one of my friends worked briefly at Four-Phase Systems. They were at the corner of 280 and De Anza Blvd in Cupertino, where Apple's

After the Tymshare diaspora, one of my friends worked briefly at Four-Phase Systems. They were at the corner of 280 and De Anza Blvd in Cupertino, where Apple's Infinite Loop buildings are now. The main thing I remember from a visit is how dreary the building was: musty dark interior hallways with low ceilings, Silicon Valley from the seventies. The tech was interesting though; their AL1 processor was based on four-phase logic like this calculator chip. https://www.google.com/search?q=four-phase+systems&tbm=isch https://www.google.com/search?q=four-phase+systems&tbm=isch https://en.wikipedia.org/wiki/Four-Phase_Systems https://en.wikipedia.org/wiki/Four-Phase_Systems