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Calculators: Handheld: Universal 777
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Size (approx): |
67mm x 130mm x 12-22mm
(w,h,d) |
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Power: |
9.0V DC, 1 x PP3 size battery, 400mW. Also accepts adapter (undefined) through a socket on the left side just above the display. | ||
| Case: | Two-piece smooth black plastic case which is wedge shaped up to the top where the 9V battery sits. The top panel has a black printed metallic label that sits in its own recess. A convex and titled red display filter gives a very bright and large digit LED display. The key labels are printed white on the case., there being no separate keyboard surround. The keys are short-travel loud-click type, my example being prone to minor bounce problems. | ||
| Display: | 8 digit red LED with bubble lens with no ninth | ||
| Features: | Four function with percentages | ||
| Age: | 1976 | ||
| Manufacturer: | Made in Hong Kong, Serial No. 06560 | ||
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Comments:
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Compact and basic calculator with one of the best LED displays I have seen - large and clear. I believe this did not have a case as the original box I have has a bubble-wrap cover. Logic is sound but the lack of a ninth digit and recovery can be annoying. |
| Components: | 1 x cpu: (square spiral logo)
C683 7604 (week 4 of 1976) , 24 pin DIL, 0.6" width 1 x IC: Display driver with no markings, 18 pin DIL, 0.3" width 1 x 8 digit red LED with bubble lens 0 x transistor 0 x diodes 0 x capacitors 2 x resistors 0 x resistor arrays 0 x transformer |
| Boards: | The keyboard assembly it fixed to the front by 12 plastic rivets and joins to the cpu board (ref AEIL 650 E01) (held by two plastic lugs) via 17 long copper wires. |
| Construction: | Remove the single screw from the back and gently separate the rear section by pressing in the front to pop the top, bottom and six side lugs. This is easiest if you approach the ones within the battery compartment that you can see. Be careful as it will be easy to cause damage. |
| Logic comments: | (CE) cancels an incorrect numerical entry and (C) and clears the calculator |
| There is automatic constant on all four functions | |
| Input overflow is suppressed, inputting a ninth digit is ignored | |
| Negative sign is shown in the immediate left hand digit but as there is no ninth digit to travel to your are limited to seven digit negative numbers. | |
| Divide by zero shows ".......0." which is not recoverable | |
| Overflow is shown by the result and all decimal points alight but is not recoverable using |
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The box on the left measures 83mm x 142mm and is 32mm deep - just about big enough to hold the calculator. It is made of strong corrugated cardboard and printed in red only. Made in Hong Kong. |
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The manual is a six-sided fold out printed in black only. It measures 65mm x 128mm and has the most basic of instructions and examples. Made in Hong Kong. |
