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Calculators: Handheld: Prinztronic M800
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Size (actual): | 83.7mm x
134.4mm x 28.1mm (max) (w,h,d) Weight 142g excluding batteries |
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Power: |
3V DC, 2 x AA size batteries. It accepts an adaptor/charger (Prinztronic ADX) through a socket on the top edge, far right. The rear labels warns "The on/off switch must be in the on position before plugging in an adaptor. The on/off switch is located on the left side and is a three-position (ON/OFF/CH) selector. | ||
| Case: | Main body is made from a two piece olive-green plastic construction: smooth for the front and stippled for the rear. The shape is lightly angled upwards at the top of the case. The keyboard surround is a brushed aluminium panel sitting in its own recess with a black plastic escutcheon. Above this a further recessed area containing the logo plate: silver with black and orange printing. My example still has a plastic film coating to this label. A wrap-around green plastic display filter sits flush at the angle of the case and gives a bright, high contrast display. Two brushed aluminium recessed panels cover the top and bottom edges. The keys are medium travel with quite a soft feel and a soft click on rebound. | ||
| Display: | 8 digit green VFD with a ninth digit for minus, error and memory indication | ||
| Features: | Standard four functions, percentages and four function memory | ||
| Age: | 1976 | ||
| Manufacturer: | Not defined. Back panel only says Prinztronic (UK Store Dixons). Made in Japan, serial number 706 000855 | ||
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Comments:
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Sturdy
calculator which reminds me of the Decimo Vatman series: tilted up top
area and identical keyboard design. The logic is impressively
robust, until you to and recover from error states - when it is
useless.
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| Components: | 1 x cpu: Texas Instruments
TMS1071NL 7628 (week 28 of 1976) 28 pin DIL, 0.3" width black plastic 1 x nine digit VFD, single tube round face 2 x transistors 4 x diodes 8 x capacitors 11 x resistors 2 x resistor arrays 1 x transformer Altas 10F |
| Boards: | The keyboard assembly (GK251-35 GICO Japan 4003-A) site loose on top of the main board and is connected by ten strong wires. It sits upon two plastic pillars to separate it from the main board. The main board (IH-031) sits loose in the rear section. |
| Construction: | Very difficult top open as the case is quite stiff. Damage may occur, so if in doubt, don't bother. I found the best way was to pop the internal lugs on the right edge first by pushing in the rear section - which is hard to get to as there is a reverse lip. Eventually the front will left off. Internal construction is very similar to Decimo (and many other) models. |
| Logic comments: | (CE) is used to cancel the last number entered whilst (C) will clear the whole calculator |
| Input overflow is suppressed, keying a ninth digit is ignored | |
| Negative numbers are shown with a "-" sign the immediate left hand digit and travelling into the far left (ninth) digit thereby allowing full eight digit negative numbers | |
| There is automatic constant on all four functions | |
| Overflow is shown by the shifted result and "°" in the far left (ninth) digit and is not recoverable | |
| Divide by zero shows "0." and "°" in the far left (ninth) digit and is not recoverable | |
| Memory storage is indicated by an upper "r" in the far left (ninth) digit | |
| Overflow in memory shows an error state and is partially recoverable: use (CM) to clear the memory and recover the most recent register but memory contents is lost | |
| No bugs found |
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With the front section removed it can be seen how the construction and keyboard assembly looks like many Decimo models. |
