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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.



"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)

My experience is similar - actually, I got more into the hardware side. Actually, I built a cassette interface of my own, since the original one was too expensive for me at that time. Along with a little 'modding' of the CP-1. And it still works, like the whole machine. Anyone interested in the schematics of my home-built cassette interface, might contact me at: stargar at gmx dot de.
Did anyone do further modding, acceleration, enhancements/improvements to the code, or manage to get anything useful attached to the system bus, besides the RAM extension?
I have not yet given up the idea of cloning the whole machine to a nifty little box and have it control something in the house.
I also wrote an enhanced version of the 'Towers of Hanoi' robot control program, which is capable of moving a tower of maximum 11 slices (with the RAM extension only), if someone might be interested. (Heck, I could make it into a *.wav file, probably an *.mp3 to get it loaded... don't know actually if the file is compatible with the original cassette interface.)


Monday 14th March 2005
Ansgar Strickerschmidt (Munich, Germany)


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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