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Calculators: Handheld: Lloytron Accumatic 305 (aka E305)
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| Size (approx): |
87mm x 138mm x 24-28mm (w,h,d) Weight 152g excluding batteries. |
| Power: | 6V DC using 4 x AA size batteries. Also accepts adapter/charger (6V DC 300mW series 255A) through a top side socket on the far right. Non-rechargeable batteries must be removed if an adapter is used. |
| Case: | Bulky square-sided calculator, the body being made of a two piece glossy black plastic design. There are two end panels, top and bottom, of dull metallic grey and a keyboard surround and escutcheon of similar matt grey plastic - that doesn't quite colour match. The keyboard surround has printed black text for the on/off switch label. A neutral oversized display filter is tilted at about 15 degrees and is printed with white text for the make and model number. The display is large and bright. The keys are large, long travel and bouncy with a soft hollow click. A large metallic sticker on the back gives examples and information. |
| Display: | 8 digit blue VFD with a ninth digit for negative and error indicators. |
| Features: | Four function with percentages, square root, pi and change sign. |
| Age: | 1975/6 |
| Manufacturer: | Lloytron, made in Japan. Serial number 5G-101854. |
| Comments: | Typical Lloyds/Lloytron design though quite a handful to hold. I think the metallic grey is spray-painted on as many examples appear to have scuffed surfaces. The logic is good apart from lack of recovery. The original case is soft black plastic with flip over flap that tucks in at the front. |
| Components: | 1 x cpu: NEC µPD0940C H5904M 28 pin DIL , 0.6"width 1 x 9 digit VFD: single glass tube, round faced 2 x transistors 4 x diodes 7 x capacitors 9 x resistors 2 x resistor arrays 1 x transformer: DCT-05 |
| Boards: | The keyboard assembly (G940C GK178-3.4 K-1 GICO Japan) sits loose on top of the main cpu board and battery compartment and is joined by 12 strong wires. The whole board assembly sits loose in the calculator. |
| Construction: | Very difficult to open without doing some damage. Gently push in the rear section sides whilst carefully popping the lugs down each side. The front section will hinge off the top. Do not force it, it took me ten minutes of gentle pushing and squeezing to open it without damage! |
| Logic comments: | The (CE) key is used to clear the last entry whilst the (C) key clears the whole calculator |
| Overflow on the input of a number is not suppressed, typing in a ninth digit results in an overflow that is recoverable using (CE) | |
| There is automatic constant on all four functions | |
| Negative numbers are flagged by a minus sign in the immediate left hand digit travelling into the far left (ninth) digit thereby allowing full eight digit negative numbers. | |
| Divide by zero shows zero and "E" in the far left (ninth) digit and is not recoverable | |
| Overflow shows the result and "C" (or "E" if negative) in the far left (ninth) digit and is not recoverable | |
| Negative square roots are allowed and result in a negative answer | |
| The change sign function can be used in mid number entry |
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A 16 pp one 2/1 colour manual which
is English from one side and French from the other. It is 140mm wide and
92mm high which is bigger than the calculator. Quite good description of functions with
guarantee of one year detailed on the last page.
From ref number E305(255A), printed in Japan
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