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Calculators: Handheld: Omron 86
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Size (approx): | 80mm x
132mm x 23mm (max) (w,h,d) Weight 126g excluding batteries and carry strap |
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Power: |
3V DC, 2 x AA size batteries, 0.4W. It accepts an adapter (3V DC 0.11A, centre negative) through socket on top side to the far right. The on/off switch is located on the right side in line with the Omron logo. Surprisingly the battery compartment is the orange bit you see on the front. | ||
| Case: | Two-piece case in orange gloss plastic for the rear and black matt plastic for the front. The front battery compartment (at the top) is orange and is printed black with the brand and model number. The small neutral display filter gives a bright clear display with handy info printed on the plastic underneath. It does, however, let a bit too much light in, exposing too much display detail. The keys are soft, springy but positive. There is a small carry strap tag to the upper right hand side that holds a smooth black plastic strap. | ||
| Display: | 8 digit blue VFD, with two point red LED indicators for negative and overflow indication. Display if left leading rather than today's normal right reading. | ||
| Features: | Standard four functions with percentages | ||
| Age: | 1974 | ||
| Manufacturer: | Omron Tateisi Electronics Co, Kyoto, made in Japan. Serial number 1033256 T is on a sticker inside the battery compartment. | ||
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Comments:
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Classic 1970s orange colour that must have gone well with contemporary furniture and wallpaper! There were several other more sophisticated sister models like the 86M, 86R and 86SR and they were all probably available in orange and yellow. The logic is poor with no recovery and several bugs. Compare to the close clone Intercord 101. |
| Components: | 1 x cpu: Omron (actually an
Hitachi) HD3672 4L41 (November 1974), 36 pin DIL, 0.6" width black
plastic 1 x 8 digit VFD unit: single glass tube round face 2 x red LEDs 5 x transistors 6 x diodes 10 x capacitors 10 x resistors 2 x resistor arrays 1 x transformer |
| Boards: | The keyboard assembly is attached to the front with seven screws. It joins to the main cpu board via 12 brass(?) wide wires. This main board is held to the rear section with two sturdy plastic lugs. |
| Construction: | Remove the long screw from the rear of the case. Carefully hinge the front off the two lower lugs. On opening you will see that the battery compartment is then a free floating black plastic unit. |
| Logic comments: | (CE) is used to cancel the last number entered and (C) to clear the whole calculator. |
| Input overflow is not suppressed, inputting a ninth digit causes and overflow which is not recoverable | |
| There is automatic constant on all four functions | |
| Negative numbers are shown by a red pin-point LED above the left hand side of the display | |
| Overflow shows the result with a red pin-point LED above the right hand side of the display and is not recoverable | |
| Divide by zero blanks the display completely and is not recoverable - only (C) will rest the calculator | |
| The change sign function (+/-) can be used in mid number entry but not before | |
| It suffers the negative zero bug: key in (1)(-)(2)(=) to give "-1" now (+)(1)(=) to give "-0" | |
| It suffers the divide to negative zero bug: key in (1)(+/-)(/)(1)(0)(=)(=)(=) etc. to eventually give "-0" |
