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Calculators: Handheld: Prinztronic SR99P (Dixons)
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Size (approx): | 80mm
(max) x 123mm x 21mm (max) (w,h,d) Weight 114g excluding batteries |
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Power: |
2.4 to 3V DC, 2 x AA size battery, 0.25W. Also accepts adapter/charger (DC 3V, 200mA) through bottom side socket on the right. The battery compartment cover has a small table showing when an adapter/charger can be used; Ni-Cd and no batteries is OK, but manganese and alkaline is not. | ||
| Case: | Stylish calculator case in two-piece black (or very dark brown) gloss plastic. It is dominated by a wrap around brushed aluminium panel on the front. This is printed with black text for the brand, model name and on/off switch label. A slightly proud but flat green display filter also wraps over the left hand edge. They keys are long travel, squishy and very reminiscent of Casio keys. | ||
| Display: | 8 digit green VFD with a ninth digit used for negative and error indication | ||
| Features: | Standard four function with percentages, sign change, square root and pi | ||
| Age: | 1976 | ||
| Manufacturer: | Made in Japan (for Dixons). Serial No. 151786 | ||
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Comments:
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High quality calculator with a stylish design that appears to be made by Toshiba. The original cover is soft black plastic with an open top and half-moon cut-outs. The logic is OK but input overflow, lack of recovery and negative square roots let it down. |
| Components: | 1 x cpu: NEC µPD940C R62786 28 pin
DIL, 0.6" width 1 x 9 digit VFD unit: round faced single tube: NEC LD8122 2 x transistors 4 x diodes 8 x capacitors 2 x resistor arrays 11 x resistors 1 x transformer unit: 515 (if that's a date code then its May 1976) |
| Boards: | The main cpu board (53-421B) sits on the base of the calculator held in place by four plastic posts and adapter socket whilst the keyboard assembly is fixed to the front. The boards are joined by a 15-way block of wires. |
| Construction: | Very difficult to open as it is sealed using internal lugs only and the sides of the case are very stiff. There is what looks like a coin slot at the top - but this appears to be useless. You have to try and squeeze in the rear of the case and pop the easiest lug. Damage is highly like so if in doubt - don't do it. The front will eventually hinge up but not off. |
| Logic comments: | The (CE) button is used once to clear entry of a number whilst (C) clears the calculator |
| Overflow on number input is not suppressed, keying in a ninth digit results in an overflow that is recoverable using (CE) | |
| There is automatic constant on all four functions | |
| Negative numbers are shown with a “-“ sign in the immediate left digit travelling into the far left (ninth) digit thereby allowing full eight digit negative numbers | |
| The sign change key (+/-) can be used in mid number entry | |
| Overflow shows the result and “C” (or “E” if negative) in the far left (ninth) digit and is not recoverable | |
| Divide by zero shows zero result and “E” in the far left (ninth) digit and is not recoverable | |
| Negative square roots are allowed and result in a negative answer |
