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|
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
This EL-811 followed the EL-8 with about 18 month 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 ICs. From the complexity of the calculator it is very similar to the smaller Canon LE-10 featuring ICs from Texas Instruments.
Dismantling a Sharp EL-811 calculator manufactured in 1972 reveals a single-board design with the two main ICs labeled Rockwell 10572 and 10573 surrounded by three integrated display drivers and a connector for the display module.
The display itself makes use of individual Itron fluorescent tubes with the odd trademark segmentation of early Sharp calculators.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.