Before the Altair 8800 , before the SCElBI, there was the Kenbak-1 -- considered to be the first personal computer by the Computer History Museum . Designed in 1970, it used Transistor-Transistor logic instead of a microprocessor -- which is one of the reasons only 40 of the units were ever sold, of which 14 are known to still exist today. That's what prompted modder funnypolynomial to produce his own using an Arduino . It may look a little more functional than the gloriously retro hexagonal design of the original, but it wouldn't take much to copy that look, too. What are you waiting for? Get ordering your blinkenlights