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Calculators: Desktop: Lloyd's 680 (aka E-680-2)
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Size (approx): |
160mm
x 160mm x 36mm (max) (w,h,d) |
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Power: |
3V DC using 1 x D size batteries. It accepts an adapter (DC 3V, 0.5W) through a socket on the top-side to the far left. | |
| Case: | Constructed from two-piece beige gloss plastic the case has all edges and corners rounded. The raised section at the top accommodates the large sized batteries. Two flanges either side of the keyboard area have no particular function. The neutral tilted display filter lets in quite a bit of light so the digits are not that bright. The keyboard area has black printed text for the switch labels and area for the brand / model number. The keys are medium travel with a loud click but work well enough. | |
| Display: | 10 digit blue VFD with a extra symbol cluster to the far left for memory, overflow and negative indicators. | |
| Features: | Standard four functions with percent, percentage mark-up, margin, count, register exchange and four function memory. Switches for decimal point and constant. RPN logic. | |
| Age: | 1979 | |
| Manufacturer: | Lloyd’s, made in Hong Kong. No serial number that I can find. | |
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Comments:
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Straightforward desktop that is obviously aimed at the financier. There is another version of this calculator with different shaped keys. Archaic Reverse Polish Notation is a pain and the display could be better. The back label on my example is in English and French. The logic is quite sound but it has very poor (i.e. none) error recovery. |
| Components: | 1 x cpu; Texas TMC1073NL MBSL
7936 (week 36 of 1979), 28 pin DIL, 0.6" width 1 x 10 digit plus symbol cluster VFD single unit flat faced; Futaba 11-BT-16A 9F (March 1979) 2 x transistors 7 x diodes 5 x capacitors 5 x resistors 3 x resistor arrays 1 x transformer |
| Boards: | The main cpu board is attached to the rear by one screw and connects th ethe keyboard assembly via a 27-way ribbon connector. The latter is attached to the front with 16 screws |
| Construction: | Remove the two screws located inside the battery compartment. The front will lift off with gently prizing of the lugs starting at the top side. |
| Logic comments: | (CE) clears the last number entered whilst a second press clears the whole calculator |
| Input overflow is suppressed, inputting an eleventh digit is ignored | |
| Negative numbers are shown with a minus in the far left symbol cluster thereby allowing full ten digit negative numbers | |
| There is switched constant (K/N) on all multiply and divide | |
| Divide by zero shows zero and a left arrow in the far left symbol cluster and is not recoverable | |
| Overflow shows zero and a left arrow in the far left symbol cluster and is not recoverable | |
| RC is used to exchange the register with the previous number entered | |
| CNT is pressed to view the count of the number of equals (or plus or minus keys) | |
| Delta percent (D%) shows the percentage difference between two numbers i.e. (5)(0)(D%)(4)(5)(=) gives “-10” which is the percentage difference | |
| (GPM) is the gross product margin. i.e. (5)(0)(GPM)(7)(5)(=) will show “33.3” which is the percentage margin on an item cost of 50 and sold at 75. | |
| Reverse polish logic is used; to perform 3-2 key in (3)(+)(2)(-), multiply and divide is used as normal. |
