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Calculators: Handheld: Canon Palmtronic LE-81M
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| Size (approx): |
77mm x 138mm x 25-36mm (w,h,d) Weight 186g excluding batteries. |
| Power: | 6V DC using 4 x AA size batteries, 0.1W. There is no adapter adapter/charger socket and I believe that the battery tray could be replaced with a rechargeable pack (4.8V 0.8W). There is a ribbon pull in the battery tray. A note on the rear label states "Use Exclusively Canon Palmtronic Charger". The on/off switch is located on the left hand side, in line with the AM switch. |
| Case: | Wedge shaped solid calculator made from a two-piece smooth black plastic construction. The whole battery compartment pulls out from the top with the batteries still in it. A red plastic flush display filter gives a very visible image with a wide angle of view. The front is dominated by the brushed aluminium keyboard surround that is printed black with the brand, model number and the AM switch label. The keys are Casio-type and long-travel, squashy by work well. |
| Display: | 8 digit red LED (flat display) with a ninth digit for negative and error indicators. |
| Features: | Four function with percentage, square root and one function memory |
| Age: | 1974 |
| Manufacturer: | Canon Inc., Japan. Serial number 507977. The removable battery tray has a label stating it as "Canon Palmtronic Dry Battery Cassette". |
| Comments: | Solid calculator with nice LED display and strange battery system. The logic is OK but let down by lack of recovery and the near useless memory function. |
| Components: | 1 x cpu: Texas TMC0605NC A 7423
(week 23 of 1974) 28 pin DIL , 0.6"width 1 x 9 digit red LED module with flat face; Bowmar Optostic 12 x transistors 2 x diodes 7 x capacitors 23 x resistors 1 x resistor array 1 x transformer: Fuji 4C30 |
| Boards: | The main cpu board (X61-9191-03 88-3637) sits loosely on top of the keyboard assembly and is joined by a 20-way ribbon cable. The latter is held to the front with five screws. |
| Construction: | Remove the two small screws from within the battery compartment and the back lifts off easily. |
| Logic comments: | The (CI) (clear input?) key is used to clear the last entry and the (C) key clears the whole calculator |
| Overflow on the input of a number is suppressed, typing in a ninth digit is ignored | |
| There is automatic constant on multiply and divide only | |
| Negative numbers are flagged by a minus sign in the far left (ninth) digit thereby allowing full eight digit negative numbers. | |
| Divide by zero shows zero and "C" in the far left (ninth) digit and is not recoverable | |
| Overflow shows the result and "C" (or "E" if negative) in the far left (ninth) digit and is not recoverable | |
| Negative square roots are not allowed and show a result and "E" in the far left (ninth) digit and is not recoverable | |
| Square root answers are limited to six decimal points for n>1 and seven decimal points for n<1 | |
| The percentage key, uses in isolation, will divide by 100 | |
| There is a switch for "accumulation" (or automatic) memory which totals the sum of everything that an equals key creates. This total can be recalled using (T). Pressing (T) a second time will clear the memory. | |
| Memory store is not indicated but the switch position reminds you |
