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K > KOSMOS > CP1 / Computer Praxis   

CP1 / Computer Praxis

Little is known about this german training kit...

The Computer is programmed with simple numbers for adding, running loops and so on, but it's not possible to program the cpu directly.

Chriz tells us :
I own a kosmos cp1 and it's still functioning. It has a very good manual which is kind of a machine language course for the cp1-inctructions. The cpu was a 8049 (8bit) with 2048 byte rom and 128 byte ram integrated (6 Mhz) and the memory+io chip a 8155 with 256 byte ram and 22 bit io. The 256 byte of 8155 ram give you 128 storage cells for the cp1-instructions (like 04.056 which means load absolute 56 into accumulator).
You could control electronics and fishertechnik with this little computer, even model trains. There was an io-interface (8 relays, 8 inputs), a cassette interface for loading and saving programs, an extension interface (another 8155 gives you +128 storage cells and 16 ios) and another io-interface with 8 leds and transistor drivers.

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


It might be worth mentioning that there''s also a multiplatform emulator available at, containing a fully commented disassembly of the ROM (

Tuesday 9th October 2018
Andreas Signer (Switzerland)

"Little is known about this german training kit..." may have been true when the article was written, but by now, quite a bit of information has surfaced:
- There are some excellent pictures, including all the expansions, at (as TOM already pointed out)
- The full set of manuals (including all expansions, in German) is available at
- Michael Mustun provided a ROM disassembly at

Best regards,

Monday 18th June 2018
Michael Graf (Germany)

Hi, you can find more info and pictures here:

Greetings TOM:-)

Monday 20th February 2012
Scouter3d (Österreich)


NAME  CP1 / Computer Praxis
TYPE  Home Computer
ORIGIN  Germany
YEAR  ? 1980
KEYBOARD  Membrane keyboard, 57 keys
CPU  8049 (8-bit)
SPEED  6 Mhz
RAM  256 bytes
ROM  Unknown
TEXT MODES  Small LED display
POWER SUPPLY  External PSU, 8-14v

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