DATAMATH CALCULATOR MUSEUM
|Date of introduction:||1977||Display technology:||LCD (yellow)|
|New price:||Display size:||8|
|Size:||5.0" x 3.0" x 0.5"|
|Weight:||4.7 ounces||Serial No:||61265585|
|Batteries:||2*AAA||Date of manufacture:||year 1977|
|AC-Adapter:||EA-17||Origin of manufacture:||Japan|
|Precision:||8||Integrated circuits:||Hitachi HD37001|
|Program steps:||Courtesy of:||Joerg Woerner|
On the first glance this Sharp EL-8024 calculator looks like one of the typical early calculators using the yellow screen LCD introduced with the EL-8020. Nevertheless it is an odd calculator using an external AC adapter together with replaceable batteries. We know the uncomfortable AC adapters from the power hungry calculators using LED (light-emitting-diode) displays or VF (vacuum-fluorescent) displays. But the main advantage of the modern LCD calculators together with calculator chips manufactured in CMOS technology was the impressive reduction in power consumption. No need for an external power supply in conjunction with the 2 AAS-sized batteries.
The following comparison table gives you an idea of the continues approach in reducing power consumption of simple 4-banger calculators:
|1972||Datamath||LED||PMOS||6*AA NiCd||3200 mWh||6h||550mW|
|1975||TI-1200||LED||PMOS||9V PP3||2800 mWh||20h||140mW|
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, March 13, 2002. No reprints without written permission.