website/content/museum/tesla-ondra.md at 3eeabe96492a2935427beadf57c531aa4674f4b5

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6,654 pages: 1,289 machines, 702 software, 460 companies, 64 history, 17 articles, 59 fun.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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2026-10-12 07:55:22 +02:00

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Raw Blame History

title, categories, types, origins, years, cpus, params

title

categories

types

origins

years

cpus

params

Tesla ONDRA

Computers

Home Computer

Czechoslovakia

1985

U880D

name

company

company_name

specs

tabs

photos

oc_id

source

ONDRA

/companies/tesla

Tesla

label	value
NAME	ONDRA

label	value
MANUFACTURER	Tesla

label	value
TYPE	Home Computer

label	value
ORIGIN	Czechoslovakia

label	value
YEAR	1985

label	value
BUILT IN LANGUAGE	None. BASIC language must be loaded from the tape.

label	value
KEYBOARD	Calculator type, 37 keys, Upper/lower case letters, Czech alphabet, arrow keys.

label	value
CPU	U880D (Z80 clone from German Democratic Republic)

label	value
SPEED	2 Mhz

label	value
RAM	64 KB

label	value
ROM	4 KB (up to 16 KB)

label	value
TEXT MODES	40 x 20 (characters matrix: 8 x 12)

label	value
GRAPHIC MODES	320 x 240 dots. Text is displayed in graphics mode

label	value
COLORS	Monochrome

label	value
SOUND	7 programmable tones (200 – 1000 Hz)

label	value
SIZE / WEIGHT	290 mm (wide) x 130 mm (deep) x 30 mm (high) / 1,5 Kg

label	value
I/O PORTS	RF TV output, Tape interface (2400 baud), Centronics (printer) + Joystick

label	value
POWER SUPPLY	External PSU +9 V

label	value
PERIPHERALS	Joystick, printer, cassette recorder

label	value
PRICE	About 20,000 Kcs (Czechoslovakian crowns) in 1987

photos

title	subtitle	text	image
LARGE VIEW		Thanks to Jan Krupka	null

title	subtitle	text	image
KEYBOARD CLOSE-UP		Thanks to Jan Krupka	null

title	subtitle	text	image
INSIDE		Thanks to MUDr. Jan P. Naidr for this picture	null

title	subtitle	text	image
WITH COLOUR TV #1		Thanks to MUDr. Jan P. Naidr for this picture	null

title	subtitle	text	image
WITH COLOUR TV #2		Thanks to MUDr. Jan P. Naidr for this picture	null

title	subtitle	text	image
THE BOX		Thanks to Jan Krupka	null

title	subtitle	text	image
ONDRA'S DESIGNER		Eduard Smutny was the designer of the Ondra. Thanks to MUDr. Jan P. Naidr for this picture	null

612

url	date
https://web.archive.org/web/20230608081413/http://www.old-computers.com/museum/computer.asp?c=612	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

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Raw Blame History