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Calculators: Handheld: Lloytron Accumatic 311 (aka E311)
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Size (approx): |
85mm (max) x 136mm x 27mm (max) (w,h,d) Weight 148g excluding batteries. |
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Power: |
6V DC with 4 x AA size batteries. It accepts an adapter/charger (6V DC 300mW, Series 255B) through a socket on the top side to the far right. Remove standard batteries before using an adapter. | ||
| Case: | Square and solid design, the main body being made of a two piece beige gloss plastic shell. A third section forms the two end panels in matt dark brown plastic which also matches the front keyboard surround. The latter has some white printed text for the on/off switch label. The neutral display filter is proud, tilted upwards and again printed with white text for the brand and model number. The large keys are squashy and wobbly with a faint click but work well to this day. | ||
| Display: | 8 digit blue VFD with a ninth digit for negative, error and memory indicators. | ||
| Features: | Four functions with percentages, square roots, change sign, reciprocal, register exchange and four function memory | ||
| Age: | 1976 | ||
| Manufacturer: | Lloytron, made in Japan, serial number 6D-105868 | ||
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Comments:
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Solid quality calculator that has some useful functions. The logic is sound with no major bugs and only let down by lack of recovery. The original cover is soft black plastic with a top flap and front band tuck-in. |
| Components: | 1 x cpu: Texas TMS1071NL A5501PB
7610
(week 10 of 1976) 28 pin DIL , 0.6" width black plastic 1 x nine digit VFD unit: Futaba 9-CT-08 round faced single tube 2 x transistors 3 x diodes 7 x capacitors 9 x resistors 2 x resistor arrays 1 x transformer: Zebra DCT-10B |
| Boards: | The keyboard assembly (E311-2 TMS-1071 T-1 GK-3571 GICO Japan 51.4.26 (26 April 1976)) rests loosely on top of the battery compartment and half covers the main board (L81T-C8). 15 strong wires connect the two boards which are not fixed to the case. The main board has a number of unused holes with component markings so I suspect this was a general PCB used for other models. |
| Construction: | Held together by internal lugs only. There is a small lever slot at the bottom end of the battery compartment that allows you to prize apart the rear section. I only found this useful after you have popped the lugs on one of the sides. You can do this by gently pushing in the rear section and levering open with a soft implement. The front will eventually lift off. Quite difficult so be careful not to damage your calculator. Very similar to the Decimo Vatman series. |
| Logic comments: | The (CE) key is used to cancel entry whilst (C) clears the whole calculator |
| Overflow on the input of a number is suppressed, typing in a ninth digit ignores the last number | |
| There is automatic constant on all four functions | |
| Negative numbers are flagged by a "-" sign to the immediate left of the number, travelling into the the far left (ninth) digit thereby allowing full eight digit negative numbers. | |
| A divide by zero shows zero and "0" in the far left (ninth) digit and is not recoverable | |
| Overflow shows the result with and "0" in the far left (ninth) digit and is not recoverable | |
| The change sign function can be used in mid number entry | |
| Negative square roots are not allowed and show the result and "0" in the far left (ninth) digit and is not recoverable | |
| Memory store is indicated by an upper "r" in the far left (ninth) digit | |
| Memory overflow appears to hook the calculator, but you can recover using (MC) and then everything is lost |
