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Calculators: Handheld: Unisonic 940 (aka 940-A)
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Size (approx): |
62mm x 95mm x 19-23mm
(w,h,d) |
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Power: |
4.5V DC, 3 x AAA size battery, 0.3W. Also accepts adapter (undefined) through a socket on the right side at the top. | ||
| Case: | Very compact two-piece smooth black plastic case. Practically the whole front is covered with a brushed aluminium front. The keyboard surround is in matching metal with black printed power labels Slightly tilted green display filter gives a bright display and has a white printed model number. The small keys are squishy but work well enough. | ||
| Display: | 8 digit green VFD with a ninth digit for negative, memory and error indicators | ||
| Features: | Four function with percentages and four function double key press memory. | ||
| Age: | est 1977 | ||
| Manufacturer: | Made in Japan, serial No. 124752 | ||
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Comments:
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Very small calculator that even managers to fit in a nine digit display. The 940-A label is from the back panel and there was also (an earlier?) 940. Basic functions but sound logic but small size reduces the memory functions to a two keystroke system. Insides are crammed with components as you would expect. |
| Components: | 1 x cpu: Mitsubishi M58618-84P
5Z3E, 24 pin DIL, 0.6" width 1 x 9 digit VFD display: flat faced glass unit 2 x transistor 2 x diodes 5 x capacitors 5 x resistors 2 x resistor arrays 1 x transformer |
| Boards: | The keyboard assembly sits on top of the small cpu board (ref 81M-20TC) and is connected via 14 stiff copper wires. The whole insides can be lifted out after releasing the adapter socket. |
| Construction: | There is a small coins slot at the top to help you lever the case apart; gently pop out the front piece lugs. It is very easy to damage this calculator so if in doubt do not do it. The whole front will then lift off, hinging from the bottom. |
| Logic comments: | (C/CE) cancels an incorrect numerical entry on the first press and clears the calculator on the second. |
| There is automatic constant on all four functions | |
| Input overflow is suppressed, inputting a ninth digit is ignored | |
| Negative sign is shown in the far left (ninth) digit thereby allowing full eight digit negative numbers. | |
| Divide by zero shows "E" which is recoverable using (C/CE) | |
| Overflow is shown by the result with the far left (ninth) digit set to "C" (or "E" if negative) and is recoverable using (C/CE) | |
| Memory store is indicated by the far left (ninth) digit decimal point | |
| Memory operation is a two-key affair; (M)(+) to add to memory, (M)(-) to subtract, (M)(=) to recall and (M)(C/CE) to clear |
