---
title: Tesla ONDRA
categories:
- Computers
types:
- Home Computer
origins:
- Czechoslovakia
years:
- '1985'
cpus:
- U880D
params:
  name: ONDRA
  image: /media/museum/photos/tesla_ondra_system_s1.jpg
  company: /companies/tesla
  company_name: Tesla
  specs:
  - label: NAME
    value: ONDRA
  - label: MANUFACTURER
    value: Tesla
  - label: TYPE
    value: Home Computer
  - label: ORIGIN
    value: Czechoslovakia
  - label: YEAR
    value: '1985'
  - label: BUILT IN LANGUAGE
    value: None. BASIC language must be loaded from the tape.
  - label: KEYBOARD
    value: Calculator type, 37 keys, Upper/lower case letters, Czech alphabet, arrow keys.
  - label: CPU
    value: U880D (Z80 clone from German Democratic Republic)
  - label: SPEED
    value: 2 Mhz
  - label: RAM
    value: 64 KB
  - label: ROM
    value: 4 KB (up to 16 KB)
  - label: TEXT MODES
    value: '40 x 20 (characters matrix: 8 x 12)'
  - label: GRAPHIC MODES
    value: 320 x 240 dots. Text is displayed in graphics mode
  - label: COLORS
    value: Monochrome
  - label: SOUND
    value: 7 programmable tones (200 – 1000 Hz)
  - label: SIZE / WEIGHT
    value: 290 mm (wide) x 130 mm (deep) x 30 mm (high) / 1,5 Kg
  - label: I/O PORTS
    value: RF TV output, Tape interface (2400 baud), Centronics (printer) + Joystick
  - label: POWER SUPPLY
    value: External PSU +9 V
  - label: PERIPHERALS
    value: Joystick, printer, cassette recorder
  - label: PRICE
    value: About 20,000 Kcs (Czechoslovakian crowns) in 1987
  tabs:
  - photos
  photos:
  - title: LARGE VIEW
    subtitle: ''
    text: Thanks to **Jan Krupka**
    image: /media/museum/photos/tesla_ondra_system_s2.jpg
  - title: KEYBOARD CLOSE-UP
    subtitle: ''
    text: Thanks to **Jan Krupka**
    image: /media/museum/photos/tesla_ondra_keyboard_s1.jpg
  - title: INSIDE
    subtitle: ''
    text: Thanks to MUDr. Jan P. Naidr for this picture
    image: /media/museum/photos/tesla_ondra_eclate.jpg
  - title: 'WITH COLOUR TV #1'
    subtitle: ''
    text: Thanks to MUDr. Jan P. Naidr for this picture
    image: /media/museum/photos/tesla_ondra_2.jpg
  - title: 'WITH COLOUR TV #2'
    subtitle: ''
    text: Thanks to MUDr. Jan P. Naidr for this picture
    image: /media/museum/photos/tesla_ondra_3.jpg
  - title: THE BOX
    subtitle: ''
    text: Thanks to **Jan Krupka**
    image: /media/museum/photos/tesla_ondra_box_s1.jpg
  - title: ONDRA'S DESIGNER
    subtitle: ''
    text: |-
      Eduard Smutny was the designer of the Ondra.

      Thanks to MUDr. Jan P. Naidr for this picture
    image: /media/museum/photos/tesla_ondra_engineer.jpg
  oc_id: 612
  source:
    url: https://web.archive.org/web/20230608081413/http://www.old-computers.com/museum/computer.asp?c=612
    date: '2023-06-08'
---

Developed in Elstroj and produced by Tesla Liberec and later Tesla Blatna, the Ondra was a low-cost system intended for computing initiation at home and school.

It was build around the U880 processor (East-German version of the Z80). It featured 64 KB RAM, 4 KB ROM and had 320 x 255 graphic capabilities. Three peripherals could be connected, a tape recorder, a Parallel printer and a joystick.

Only 1000 units were ever made. Then Tesla wanted to give the manufacturing to other firm. Unfortunately that never happened.

Picture and information from **Jan Krupka**