A typical System 21 includes a 'Microprocessor' two tape channels- a keyboard- two data channels- and a video display. The Microprocessor contains hard-wired microprograms that perform a fixed set of logical operations- accomplising the same functions as a general-purpose computer. Communications is provided between 2 system 21s or a system 21 and a mini-computer. The system was underpriced and over-promised- and the company shortly went out of business.
