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.
If you have additions to the above article please email: email@example.com.
© Joerg Woerner, December 5, 2001. No reprints without written permission.