DATAMATH CALCULATOR MUSEUM
|Date of introduction:||1974||Display technology:||VFD|
|New price:||Display size:||8|
|Size:||6.9" x 4.2" x 1.8"|
|Weight:||16 ounces||Serial No:||4200172X|
|Batteries:||6*AA cells||Date of manufacture:||year 1974|
|AC-Adapter:||Origin of manufacture:||Japan|
|Precision:||8||Integrated circuits:||NEC uPD277C|
|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-8102 continued the approach of the EL-811 to reduce the complexity of the calculator brain. Instead the former two chip architecture based on Rockwell IC's this one uses a real single-chip design.
Dismantling a Sharp EL-8102 calculator manufactured in 1974
reveals a single-sided printed circuit board (PCB) based on a NEC uPD277C
calculator chip and some discrete driver electronics for the display module.
The display module itself makes still use of single fluorescent tubes but with the Rockwell chips is the odd segmentation of the numerals gone, too.
You like this housing? Don't miss the EL-808.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, July 22, 2002. No reprints without written permission.