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Calculators: Handheld: Sharp Elsi EL-8002
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Size (approx): | 87mm x 143mm x
12-40mm (w,h,d) Weight 190g excluding batteries |
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Power: |
4.5V DC, 3 x AA size batteries. Also accepts an adapter (DC 4.5V 0.3W EA-12A) through a socket on the top side to the far left. The three batteries stack in two layers which explains the wedge shape. A ribbon-pull is provided to remove the batteries. The on/off switch is on the left hand side just above the Sharp logo. | |
| Case: | Two piece main case in blue mottled plastic with two white smooth plastic side pieces. It is very wedge shaped making it ideal for desktop or for use in the hand. An oversized green display filter is flat and flush and gives a very bright image. Below the display is an aluminium sticker printed with red and brown text which sits in its own recess. They keys are squishy with a bit of a hollow sound but work very well to this day. There is a carry strap eyelet on the left hand side near the top. | |
| Display: | 8 digit green VFD with a ninth digit for negative and error indicators. | |
| Features: | Four function plus percentages | |
| Age: | 1974 | |
| Manufacturer: | Sharp Corporation, Made in Japan. Serial number 41023020 on the rear sticker. | |
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Comments:
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Solid feeling dual purpose but basic calculator. Note the earlier use of Elsi, rather than Elsimate in the name. Similar in design to the EL-122. The logic is weak with no recovery and the "negative zero" bug. The best thing about it is the carry strap and bright display. |
| Components: | 1 x cpu: Hitachi HD3623 4J 21 C
(September 1974 date code), 42 pin DIL, 0.6" width 1 x 9 digit VFD display, single tube round faced 2 x transistors 6 x diodes 7 x capacitors 2 x resistors 2 x resistor arrays 1 x transformer: TDK 1219 Japan |
| Boards: | Only one main board (N1196CC) that doubles as the keyboard board. It is attached to the front by five screws. |
| Construction: | Remove the screw from the rear and very gently lever the top sides apart, pushing in the rear section. Hinge off from the bottom and the back will come off. Quite difficult so be careful. |
| Logic comments: | The (CE) key clears the last number entered whilst (C) clears the whole calculator |
| Input overflow is suppressed, inputting a ninth digit is ignored | |
| There is automatic constant on multiply and divide only | |
| Negative numbers are shown by a "-" displayed in the far right (first) digit thereby allowing full eight digit negative numbers | |
| Divide by zero result in the display of ".......0.C." and is not recoverable | |
| Overflow results in the display of ".......0.C." and is not recoverable | |
| Negative square roots are not allowed and result in "0.C" and is not recoverable | |
| This calculator suffers the "negative zero" bug; try (1)(-)(2)(=) to give "-1" then (+)(1)(=) will give "-0" |
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The scan of the
interior on the left shows the single double-sided cpu/keyboard board from
the rear. Quite a small number of components considering its early
date. Look at the length of that Hitachi IC - nearly as wide as the
calculator!
Most of the components on the right are for generating the high voltages needed for the display tube. Compare this to the inside of the EL-122. |
