DATAMATH CALCULATOR MUSEUM
|Date of introduction:||1971||Display technology:||Fluorescent|
|New price:||$379||Display size:||8|
|Size:||6.9" x 4.2" x 1.8"|
|Weight:||20 ounces||Serial No:||2007663|
|Batteries:||EL-84 (6*AA NiCd)||Date of manufacture:||year 1972|
|AC-Adapter:||EL-81||Origin of manufacture:||Japan|
|Precision:||8 (Mult. 16)||Integrated circuits:||Rockwell 10572, 10573|
|Program steps:||Courtesy of:||Joerg Woerner|
Sharp Electronics Corporation introduced end of the year 1969 with the EL-8 the first portable, battery operated calculator. It uses the same technology as the earlier desktop calculator QT-8D.
This EL-811 followed the EL-8 with about 18 month delay and uses a very similar architecture. Due to the big steps in IC-Technology (Integrated Circuits) the EL-811 sports more features (memory, 16 digit multiplication results) with only 2 IC's. From the complexity of the calculator it is very similar to the smaller Canon LE-10 featuring IC's from Texas Instruments.
Do get an impression about the valuable internal construction just take your time and watch the next five pictures carefully.
|This picture gives you an idea of the sleek design of the calculator.|
|The display uses still the single tubes introduced with the EL-8.|
|This picture demonstrates the odd segmentation of the single tubes.|
|Multiplication results with up to 16-digits could be displayed.|
|The printed circuit board of the calculator brain shows the later 2-chip design developed by US company Rockwell together with the Hitachi display drivers.|
The same housing was used again with the EL-8102 introduced in 1974.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.