---
title: KOSMOS CP1 / Computer Praxis
categories:
- Computers
types:
- Home Computer
origins:
- Germany
years:
- '1980'
cpus:
- '8049'
params:
  name: CP1 / Computer Praxis
  image: /media/museum/photos/kosmos_z80-training-kit_1.jpg
  company: /companies/kosmos
  company_name: KOSMOS
  specs:
  - label: NAME
    value: CP1 / Computer Praxis
  - label: MANUFACTURER
    value: Kosmos
  - label: TYPE
    value: Home Computer
  - label: ORIGIN
    value: Germany
  - label: YEAR
    value: ? 1980
  - label: BUILT IN LANGUAGE
    value: Machine code
  - label: KEYBOARD
    value: Membrane keyboard, 57 keys
  - label: CPU
    value: 8049 (8-bit)
  - label: SPEED
    value: 6 Mhz
  - label: CO-PROCESSOR
    value: 8155 (I/O)
  - label: RAM
    value: 256 bytes
  - label: ROM
    value: Unknown
  - label: TEXT MODES
    value: Small LED display
  - label: GRAPHIC MODES
    value: None
  - label: COLORS
    value: None
  - label: SOUND
    value: None
  - label: POWER SUPPLY
    value: External PSU, 8-14v
  forum_thread: 488
  oc_id: 494
  source:
    url: https://web.archive.org/web/20221203195223/http://www.old-computers.com/museum/computer.asp?c=494
    date: '2022-12-03'
---

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.