Sharp EL-122
Brief History
The first affordable pocket calculator, the Casio Mini introduced in the Japanese market in August 1972, and drew the attention of the competition to the viability of similar machines with a much simpler design and fewer functions than standard eight-digit calculators with floating point arithmetic. Half a year later, in March 1973, Sharp appeared with the EL-120, which has accuracy of 12-digit, but was only able to display three digits at a time. Its successor, the landscape designed EL-121 and the usual shaped EL-122 appeared in 1974. The only difference was that the EL-122 had a CE function to clear erroneous entries; in other respects, both machines calculated results with 12-digit precision with full floating decimal point, but the display showed either the first or the last 6 digits at once: the identification was aided by the fact that the LED below the display was lit when the first six digits were displayed. The low prices achieved by simple six-digit calculators also had an impact on other models, too, so slowly all manufacturers switched to eight-digit calculators, so Sharp did not release more six-digit models.
Manufacturer: | Sharp Corporation (Japan) |
Mfg. date: | 1974 |
Size: | 8,8×14,2×3,9 cm |
Weight (ready for operate): | n.a. |
Type: | four-function |
Capacity: | 12 digits (input) 2×6 digits (display) 12 digits (internal precision) |
Operating logic: | algebraic |
CPU: | NEC uPD227C |
Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) |
Features: | Ffloating-point notation |
Display: | 6 digit VFD (Futaba 6-CT-04) |
Power: | 3×AA battery or adaptor |
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