Cosmicos is the name for a SBC around the RCA 1802 CPU. Cosmicos stands for COSMAC MINI COMPUTERSYSTEM.
Published in the dutch magazine Radio Bulletin, developed by the editor (later editor in chief) Bob Stuurman.
The system is loosely based on the Cosmac ELF design. Compatibility with the ELF was later improved in the cassette routine loader, Tom Pitmann’s Tiny Basic and such.

Have a look at the Spare Time Gizmo Cosmac ELF 2000 for a kit to build an ELF board now!

The goal of the development of the Cosmicos system was a simple microcomputer, selfbuilt and fit for expansion and experiments.
In the picture above you see the Cosmicos with many expansions developed by Bob, like a hex keyboard and 8 LED displays, cassette interface, RAM and ROM cards. The basic system is the board itself, without software in ROM, simple digits and two seven segment LED displays.

The design and well written articles and the availability of the PCB’s made the Cosmicos a succes, many were built and a user club became active around the system.

On this page:

• The Cosmicos book
• A Cosmicos build
• Cosmicos articles
• A Cosmicos donated by Henk Stap

Articles on the Cosmicos appeared from september 1979 to april 1984. The series ended with the design of a floppy disk interface, combined with 48K RAM and a videodisplay. From simple microprocessor to complete computer system, truly a story worth to be told.

The book

Cosmicos book part 1
Cosmicos book part 2
Cosmicos book part 3
Cosmicos book part 4

This is a dutch book!
(thanks to Rob Uiterlinden)
Het boek bevat alle artikelen verschenen in Radio Bulletin, van september 1979 tot en met April 1981.

Bob Stuurman, 1984	First version Cosmicos april 1979

A Cosmicos build

My Cosmicos was acquired by me in 2008. It was a badly abused and poorly constructed board, and it took a lot of effort to restore it to the original state.
All additions not original were removed, bad soldering repaired, cleaned, damaged components such as the led display replaced, new legends on the buttons added.On the next pictures you see the board as it is now. Still missing is the battery holder, the one on the board was heavily corroded (the careless owner had forgotten to remove leaking batteries).
The Cosmicos shown here has two 4K RAM cards, total of 8K RAM and one 4K EPROM card with the ASCII monitor in a 2716 EPROM.

Radio Bulletin artikelen Cosmicos

All Radio Bulletin articles about the Cosmicos as published are listedbelow.

This is the list of scanned articles , since they appeared after the book was published or were
not included in the book. All articles are in dutch!

Publicatie artikelen en boek met toestemming van Uitgever en rechthebbende.

All articles as they appeared in Radio Bulletin, about the 1802.

The COSMICOS system given to me by Henk Stap