Tor-Eirik Bakke Lunde
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Description
RC1802 Cosmac ELF (CPU module revision F)
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!
Code
https://github.com/tebl/RC1802-Cosmac-ELF
Schematic and Layout
https://github.com/tebl/RC1802-Cosmac-ELF
Jan 13,2019
5,915 views
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RC1802 Cosmac ELF (CPU module revision F)
2 Layers PCB 100 x 100 mm FR-4, 1.6 mm, 1, HASL with lead, Blue Solder Mask, White silkscreen
The Cosmac ELF is an iconic piece of computing history dating all the way back to 1976, it even powered the Galileio spacecraft!
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Published: Jan 13,2019
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D9 is a small signal diode, 1n4148.
ok thanks !
Sorry about that, I've been distracted and apparently that's not a new thing. From what I can tell from the commit logs I've changed around the pins between revisions, added a bit of subterfuge by not updating the silkscreen and then confused myself entirely along the way by bumping the revision numbers without doing much actual work. I've added it to the errata page as well as updated the shared projects with the latest gerber files, so that hopefully more people can get them working as well!
So, is everything up to date with Revision E now, or will we have to do some modifications?
I meant Revision F.
I have quite a few ideas for future boards, but have been focusing mostly on other SBC-designs like my KIM-1 Replica (RC-ONE) the last year or so. The bottom pins is for expansions and can be plugged into an RC2014-compatible backplane such as the one I made for the RC6502 Apple 1 replica computer, so in essence you can do anything with it :-)
No need to pay, I get a small donation every time someone orders them the shared project. If you want the files, the latest version is found on the github page :-)