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Calculators: Handheld: Privileg 85
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| Size (approx): |
77mm x 152mm x 9-20mm (w,h,d) Weight 98g excluding batteries |
| Power: | 9.0V DC, 1 x PP3 size battery. It accepts an adapter (undefined, 9V DC centre negative) on the top edge to the far right |
| Case: | Wedge shaped calculator made form a two piece matt black plastic case narrowing to quite a thin point. The red plastic display filter is flat , flush and tilted to give a bright but limited angle of view. Below this is a metal panel with black lines and text for the brand name and model number. This has not survived well and the on/off switch label has completely gone. The keys are large (scrabble-tile like) with a very short travel and loud positive click. On my example they do not work well. |
| Display: | 8 digit red LED with bubble lens and no ninth digit |
| Features: | Standard four function with percentages, item count and increment |
| Age: | 1975/6 |
| Manufacturer: | Worn label on the rear is difficult to read. Possible order number 460.6513, serial number 34687. |
| Comments: | Slim calculator with lovely keys of which there are at least two versions. This example appears to have the lines (what's left of them) in black only, whilst other examples of the web appear to have rainbow lines. The logic appears sound with interesting features but badly let down by the lack of recovery and seven digit negative numbers. |
| Components: | 1 x cpu; Mostek MK50282N Malaysia
7543 A (week 43 of 1975), 28 pin DIL, 0.6" width black
plastic 1 x 8 digit red LED module with individual bubble lens: NS A1188 543P 8 x transistors 9 x resistors |
| Boards: | The main board doubles as the keyboard assembly and is attached to the front with eight screws. |
| Construction: | Quite difficult to open as it is held together by internal lugs only. I found the best way was to pop the top edge, then work down the sides with a wooden lollipop-stick - pressing in the front piece sides. Be very careful as it is easy to damage you calculator. The rear will eventually hinge off from the bottom. |
| Logic comments: | The (C/CE) is used to clear an input number whilst a second press will completely reset the calculator |
| Overflow on the input of a number is not suppressed. Keying in a ninth digit results in an overflow which is not recoverable using | |
| There is automatic constant on multiply and divide only | |
| The negative sign is shown in the immediate left hand digit but as there is no ninth digit to travel into you are limited to seven digit negative numbers | |
| Overflow shows the result flashing and is not recoverable | |
| A divide by zero error shows zero flashing and is not recoverable. | |
| The (I) key can be used to see the number of items that have been the result of an (=) key press | |
| The (N) keys adds one to the least significant digit of the number | |
| The percentage key divides the displayed number by 100 | |
| There are no obvious bugs. |
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This image shows
the calculator with the back removed. You can see the nearly full
length single board that doubles as the keyboard assembly and main cpu
board.
It is surprising to see such a late LED calculator with transistor drivers for the display: obviously the Mostek IC could not drive the high current directly. |
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