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Sphere 1

The Sphere I was a personal computer completed in 1975 by Michael Donald Wise and Monroe Tyler of Sphere Corporation, of Bountiful, Utah. The Sphere I featured a Motorola 6800 CPU, onboard ROM, a big Monitor, 4 KB of RAM, and a keyboard with a numeric keypad. The Sphere I was among the earliest microcomputers. Michael touted it as the first “true PC” because it had a keyboard, a number pad, a monitor, external storage, and did not run on a punch tape. When Byte Magazine did its annual history of the computer, it always included Sphere 1, showing that prior microcomputers lacked the user I/O interface built into the Sphere I.

ManufacturerSphere CorporationCPUMotorola 6800
Year Introduced1975RAM4KB
Introductory Price$860

The Sphere 1 also included a keyboard operated reset feature consisting of two keys wired in series that sent a reset signal to the CPU triggering a Hard reboot. Wise considered this to be the first keyboard activated reset – a predecessor to the now-common Control-Alt-Delete combination.

Sphere 1 (1)

Sphere 1 (2)

Sphere 1 (3)

  1975  /  Other  /  Last Updated October 21, 2017 by Curator  /