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Calculators: Handheld: Prinztronic SR99M (type 4)
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Size (approx): |
80mm
(max) x 123mm x 21mm (max) (w,h,d) Weight 106g excluding batteries |
| Power: | 2.4 to 3V DC, 2 x AA size battery, 0.25W. Also accepts adaptor/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 with charger is OK but no batteries must be used with the adaptor. Manganese battery life is quoted as four hours, Ni-Cd four hours, and charging time 4-7 hours. | ||
| 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, error and memory indication | ||
| Features: | Standard four function with percentages, square root and four-function memory | ||
| Age: | 1977 | ||
| Manufacturer: | Made in Japan, serial No. 271421 | ||
| Comments: | High quality calculator with a stylish design. The original cover is soft black plastic with an open top and half-moon cut-outs. There are four documented versions of this calculator. The logic is very good with good recovery and no bugs but let down by negative square roots. Very similar to the Nestler OH 2001A. |
| Components: | 1 x cpu: Texas TMS1045NL 7650 (date code
week 50 of 1976), 28 pin DIL, 0.6" width black plastic 1 x 9 digit VFD unit: round faced single tube: Toshiba E6532A 1 x transistor 5 x diodes 5 x capacitors 0 x resistor arrays 6 x resistors 1 x transformer unit: 558A |
| Boards: | The main cpu board (33-421A) is placed on top of the keyboard and sits loose, held only by and the adapter socket. This is joined to the keyboard assembly by a 15-way ribbon 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 front of the case (on the left), the rear (on the right, top and front) and pop the easiest lug. Damage is highly like so if in doubt - don't do it. The back will eventually lift of but loosen the adapter washer first. |
| Logic comments: | The (C/CE) button is used once to clear entry of a number, a second time to clear the calculator |
| Overflow on number input is suppressed, keying in a ninth digit is ignored | |
| There is automatic constant on all four functions | |
| Negative numbers are shown with a “-“ sign in the far left (ninth) digit thereby allowing full eight digit negative numbers | |
| Overflow shows the result and “C” (or “E” if negative) in the far left (ninth) digit and is recoverable using (C/CE) | |
| Divide by zero shows zero result and “C” in the far left (ninth) digit and is recoverable using (C/CE) | |
| Memory store is indicated by an upper "n" in the far left (ninth) digit | |
| Overflow in memory shows and error state and holds the shifted result | |
| Negative square roots are allowed and result in a negative answer | |
| No bugs found |
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The manual (left)
measures 74mm by 106mm and is 16 pages. The front cover is in
metallic silver, metallic bronze, purple and black, whilst the inside
pages are black only.
Basic instructions but plenty of examples. It also has a duplication of the power source options. Defines adapter/charger as centre positive. TS06134LW-1, Printed in Japan. |
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