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Calculators: Handheld: Canon Palmtronic LE-84
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Size (approx): | linked
not started 73mm
(max) x 153mm x 24mm (max) (w,h,d) Weight 140g excluding batteries. |
| Power: | 6.0V DC, 4 x AA size batteries, 0.4W. Also accepts adapter (undefined) through a top side socket on the left. Power switch is in line with the Canon logo. Battery compartment has black ribbon-pull. | ||
| Case: | Smooth two-piece black plastic case with bronze-coloured brushed metal keyboard surround. The top section has a black printed metallic sticker with the brand and model number that sits in its own recess. This section is actually the battery cover - they are inserted from the front. A red, linearly convex, plastic display filter gives extra magnification and is slightly tilted inwards at the bottom. Casio-like buttons with squishy long travel are very positive with a plastic sounding click on depression and release. | ||
| Display: | 8 digit bubble lens red LED with a discrete red LED on the far right used for negative indication. | ||
| Features: | Basic four function | ||
| Age: | 1974 | ||
| Manufacturer: | Canon Inc., made in Japan, serial number 692340 | ||
| Comments: | Solid calculator but having the batteries at the top front make it odd to hold - balance is achieved by holding it about two thirds the way up. The logic is quite good but let down by lack of recovery and the very odd two-way negative indication. Original case is black plastic with top flap and front popper closing, with Canon embossed on the front. |
| Components: | 1 x cpu; Texas TMS0801NC 7413 (week
13 of 1974) 1 x 8-digit bubble lens LED unit, it has a ninth lens but no digit: Antex SK-3-307 1 x discrete red LED 1 x diode 5 x capacitors 20 x resistors 3 x SIL resistor arrays |
| Boards: | The keyboard assembly is fixed to the front with four screws and joins to the main cpu board (X61-9178-03) with an 18-way short ribbon cable. The whole assembly sits loose in the case |
| Construction: | Undo the lower screw only in the battery compartment. Squeeze the lower half and lift off the top after gently popping the lugs. Whole keyboard and main cpu board assembly will then lift off. |
| Logic comments: | The clear input (CI) key is used to clear the last number entered whilst (C) completely resets the calculator |
| Overflow on the input of a number is suppressed: keying a ninth digit is ignored | |
| There is automatic constant on all four functions | |
| Negative numbers are shown with a "-" sign in the immediate left hand digit, however, eight digit negative numbers are shown with the far right red LED alight, thereby allowing full eight digit negative numbers | |
| Overflow shows the result flashing and is not recoverable | |
| Divide by zero shows zero flashing and is not recoverable - there is a rather odd artefact on my example in this mode that briefly shows "90000" before the flashing zero | |
| No major bugs found |
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This image shows the additional instruction sheet for the LE-83 calculator with instructions on battery insertion to the unusual top front area. |
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