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Calculators: Handheld: Sharp EL-8100S (Elsimate)
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Size (approx): |
85mm x 123mm x 27mm (max) (w,h,d) Weight 188g excluding batteries. |
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Power: |
6V DC with 4 x AA size batteries. It accepts an adapter (6V DC 0.45W model EL-971) through a socket on the bottom side to the far right. The battery compartment has a ribbon pull to aid battery removal. The on/off switch is on the left hand side in line with the Sharp logo. | ||
| Case: | Square and solid design, the main body being made of a three piece smooth light grey and matt dark blue plastic set. An oversized inset and flat green plastic display filter gives a clean bright image. On the lower section of this is a red printed metallic sticker with the company name. Underneath the filter (and barely visible) is the white printed model number. The keyboard surround has the familiar and not very stylish black printed sticker with Made in Japan. The keys are soft and squashy with deep sculptured symbols. There is a sturdy blue plastic lug for a carry strap on the left hand side. The bottom edge has the words Sharp Elsi mate embossed in the blue plastic. | ||
| Display: | 8 digit green VFD with a ninth digit for negative, error and memory indicators. | ||
| Features: | Four function with percentages, square roots, change sign and three function memory | ||
| Age: | est. 1975 | ||
| Manufacturer: | Sharp Corporation, made in Japan. Serial number 4106843Y is on a sticker on the inside of the battery compartment. | ||
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Comments:
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Solid quality calculator that is a little wide for a handheld and has the quirky ninth digit on the right common to Sharp calculators of this era. The logic is very solid but let down by the lack of recovery. I cannot understand why they would put the model number in such an awkward place as you can only just see it (it is much clearer on this scan than in real life!). |
| Components: | 1 x cpu: NEC µPD277C E4X936
28 pin DIL , 0.6"width 1 x nine digit VFD unit: Futaba 9-CT-04 round faced single tube 3 x transistors 8 x diodes 8 x capacitors 17 x resistors 1 x resistor array 1 x transformer |
| Boards: | The main cpu board (PWBF1198CC-A) sits on top of the keyboard assembly and is joined by a 14-way ribbon cable. The whole assembly being secured to the front with eight screws. A metal screening plate covers the main cpu board with an acetate screen to protect the board from shorting. |
| Construction: | My example appears to missing the single screw inside the battery compartment. Removal of the rear section is then easy - if you know that the seal is not between the blue and grey plastic but between the grey back and the grey sides! |
| Logic comments: | The (C/CE) key is used to cancel entry on the first press and clears the whole calculator on the subsequent |
| Overflow on the input of a number is suppressed, typing in a ninth digit ignores the last number | |
| There is automatic constant on multiply and divide only | |
| Negative numbers are flagged by a "-" sign in the far right (ninth) digit thereby allowing full eight digit negative numbers. | |
| A divide by zero shows zero and "C" in the far right (ninth) digit and is not recoverable | |
| Overflow shows the result with "C" ( "E" if negative) in the far right (ninth) digit and is not recoverable | |
| The change sign function can be used in mid number entry | |
| Negative square roots are not allowed and result in an overflow display and is not recoverable | |
| Memory store is indicated by the decimal point of the far right (ninth) digit | |
| Memory overflow keeps the original total in place | |
| The percentage key just divides the current number by 100 |
