This April, 1978 ad for the Bytemaster computer from Denver's Digital Group Bytemaster is a pretty fascinating look at the first hesitant tendrils of the personal computer, a year after the introduction of the Apple ][+. The form-factor prefigures the Kaypro and the "portable computing" revolution, but also shares some heritage with the ubiquitous radio-with-handle devices of the day, from boom-boxes to little kitchen models.