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Calculators: Handheld: Hanimex ESR 80
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Size (approx): |
83mm
x 135mm x 24mm (w x h x d) |
| Power: | 6.0V DC using 4 x AA size batteries. Can accept an adapter (6V DC, 100mA) through a socket on the top side to the far left. | ||
| Case: | It is a very sturdy two-piece white and black matt plastic case with an middle metallic plastic strip originally painted black. A brushed aluminium keyboard surround has some printed black text labelling on the on/off switch. A slightly proud but flat oversized, wrap-over neutral display filter gives a clear, deep image. It has white printed boarder and green and white model text. The keys are short travel, loud click type and nearly flush with the calculator. The colour scheme is somewhat bold!. | ||
| Display: | 8 digit green VFD with a ninth digit for negative, memory and error indication. | ||
| Features: | Standard four functions with percentages, square root, square, register exchange, recirprocal, and four function memory. | ||
| Age: | 1975 | ||
| Manufacturer: | It just states made in Hong Kong. The serial number is inside the battery compartment E-14 08018. | ||
| Comments: | Very solid calculator with nice deep-seated green display. Keys are rather weird but still work well. The logic is not bad with good recovery but let down by negative square roots and the pseudo fixed decimal bug. The original case is soft black plastic with a flip over top and front tuck-in for closing. |
| Components: | 1 x cpu: Rockwell A1241PA 7514 (week
14 of 1975), 42 pin staggered DIL 0.6" width metal capped black
ceramic 1 x 9 digit VFD unit, single glass tube round faced 2 x transistors 12 x diodes 8 x resistors 2 x resistor arrays 6 x capacitors 1 x transformer |
| Boards: | The keyboard assembly is a PCB with metal click-pads and is soldered to the battery terminals. The keys remain in place on the front section of the calculator. This is attached to the main cpu board with 18 wires. The cpu board is fixed to the rear by two sturdy metal posts. |
| Construction: | It is quite difficult to pop the lugs from the front section, there are two either side. Not recommended as damage is likely. |
| Logic comments: | The (CE/C) key is used to once to clear the last entry and a second time clears the whole calculator. |
| Input overflow is suppressed, typing in a ninth digit is ignored | |
| There is automatic constant multiply and divide only | |
| Negative numbers are indicated by a “-“ in the far left (ninth) digit thereby allowing full eight negative numbers. | |
| Overflow shows the result and “o” in the far left (ninth) digit and is recoverable using (CE/C) | |
| Divide by zero results zero and “o” in the far left (ninth) digit and is recoverable using (CE/C) | |
| Negative square roots are allowed and result in a negative number | |
| Memory store is indicated by the decimal point of the far left (ninth) digit | |
| Memory use is through a two key sequence such as (M)(+) and (M)(-) with (M)(=) to recall and (M)(CE/C) to cancel | |
| Memory overflow stores the truncated result | |
| It suffers the pseudo fixed decimal bug: key in (1)(+)(.)(0)(0)(0)(=) to give "1.000" which remains a fixed three digit decimal until more digits are needed or you use multiply or divide |
