DATAMATH CALCULATOR MUSEUM
Schoenherr Braillotron TI-2550 II
|Date of introduction:||1976||Display technology:||Fluorescent and Braille cells|
|New price:||Display size:||8|
|Size:||8.3" x 4.7" x 2.8"|
|Weight:||2 pounds 6 ounces||Serial No:||TI2550/62/78 036721|
|Batteries:||9 AA-size NiCd||Date of manufacture:||year 1978|
|AC-Adapter:||Custom||Origin of manufacture:||Germany|
|Program steps:||Courtesy of:||Siegfried Kipke|
is very difficult to estimate the date of introduction of this Schoenherr
Braillotron based on the Texas Instruments TI-2550
II. This calculator had a short life, introduced October, 1975 it was soon
replaced with the TI-2550 III. The company history of Schoenherr
GmbH, Horb (Germany) reveals that Mr. Schoenherr founded the company in 1974
and invented the world’s first Braille element that could display and erase
Braille characters in 1975. This would match with the timeframe of the TI-2550
II and gives a possible introduction of the Schoenherr Braillotron in 1976.
Only few years later the TI-30
was adapted to the Braillotron and enabled vision
impaired people using this best selling scientific calculator. Read more
information about the Braille Alphabet.
In 1981 Mr. Schoenherr was killed in an
accident and two years later the company was taken over by the "Deutsche
Blindenstudienanstalt", a non-profit-organization in Marburg as EHG GmbH
and was the production site for Braille displays. Since 1994 the company
refirmed as EHG Handy Tech
Elektronik GmbH and continued the development of talking scientific calculators
with or without braille display.
Braille natural voice speech output and
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© Joerg Woerner, December 26, 2002. No reprints without written permission.