There are two ways you can get involved with computers on the nonprofessional level. You can buy one of several reasonably priced hobby computers, with all the added bells and whistles you'd ever want. On the other hand, you can build your own inexpensive system from scratch. It has to be good, as part of the circuitry of the Galileio spacecraft it even circled Jupiter!

That was rougly the start of the iconic Cosmac ELF-computers history, it was august 1976 and Popular Electronics magazine had just printed the first in a series of tutorials on how everyone could build their own computers using only common parts and the new 1802 processor from RCA.

With this as well as the corresponding revision F UI-module you can build your own Cosmac ELF computer, see documentation links for pictures as well as lists of all the other components needed to complete the kit. If you have a previous revision of this board, see the github page for the errata section as mistakes were made along the way!