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Calculators: Handheld: Decimo Super Vatman
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Size (approx): |
83mm
(max) x 132mm x 30mm (max) (w,h,d) |
| Power: | 6.0V DC, 4 x AA size batteries, 0.45W. Also accepts adapter/charger (undefined) through a top side socket on the right. | |
| Case: | Chunky two piece plastic case. Bottom is beige, top is matt black. Oversized, wrap over green display filter has painted logo. Decimo logo is metal inset panel. Keyboard surround is brushed aluminium. Top is slightly tilted upwards, including the back which causes the calculator to rock, especially with no batteries to weigh it down. Keys are squishy but positive to use. | |
| Display: | 8 digit green VFD display - ninth used for minus and memory sign. | |
| Features: | Basic four function with percentages, pi, change sign and square roots. Three function memory. | |
| Age: | estimate 1976 | |
| Manufacturer: | Decimo Electronic Handy Calculator. Made in Japan. Serial No. 89576 | |
| Comments: | Classic calculator which has a quality feel in the hand. Logic sound. Imbalance on the desk let it down. Original black plastic case has top cover which is open top. For those non-UK viewers, VAT stands for Value Added Tax - the purchase tax system in the UK. |
| Components: | 1 x cpu; NEC D18122C K96039 R61076 1 x single flat faced tube 9 digit VFD tube 1 x transformer 1 x transistor 6 x capacitors 3 x resistors 4 x diodes |
| Boards: | The keyboard panel rests on top of the battery compartment and is joined to the keyboard (ref W801) by 9 screws. A flexible 15-way connector joins this to the main board. |
| Construction: | Front can be gently prized off after using the coin guide at the top. Squeeze the cream plastic sides so the lugs separate without breaking. |
| Logic comments: | The Clear Entry key (CE/C) is used to clear an input number, and a second press to completely reset the calculator |
| Overflow on the input of a number is suppressed - typing in nine digits ignores the ninth | |
| The constant function is automatic on all four functions | |
| The negative sign is shown to the immediate left of a number and travels into the ninth (far left) digit thereby allowing full eight digit negative numbers. | |
| Memory store is flagged by the ninth (far left) decimal point alight. | |
| Overflow is shown by a "C" in the ninth (far left) digit ("E" if negative) . Error is not recoverable. | |
| Negative square roots are not allowed but result in the answer and is not recoverable | |
| A divide by zero error is shown by a "C". It is not recoverable. |
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