Altair

"The Altair 8800 is a microcomputer designed in 1974 by MITS and based on the Intel 8080 CPU.^[1] Interest grew quickly after it was featured on the cover of the January 1975 issue (published in late November 1974)^[2] of Popular Electronics, and was sold by mail order through advertisements there, in Radio-Electronics, and in other hobbyist magazines. The designers hoped to sell a few hundred build-it-yourself kits to hobbyists, and were surprised when they sold thousands in the first month.^[3] The Altair also appealed to individuals and businesses that just wanted a computer and purchased the assembled version.^[4] The Altair is widely recognized as the spark that ignited the microcomputer revolution^[5] as the first commercially successful personal computer.^[6] The computer bus designed for the Altair was to become a de facto standard in the form of the S-100 bus, and the first programming language for the machine was Microsoft's founding product, Altair BASIC."

https://en.wikipedia.org/wiki/Altair_8800

http://hackaday.com/2014/12/12/online-altair-8800-clone-lets-you-play-zork/

http://hackaday.com/2017/03/24/doing-it-with-fewer-bytes-than-bill-gates/