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Calculators: Handheld: Office International H (unknown ID number)
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Size (approx): | 78mm
(max) x 127mm x 21mm (max) (w,h,d) Weight 110g excluding batteries. |
| Power: | 3.0V DC, 2 x AA size batteries, 0.2W. Also accepts adapter (3V 0.2A, centre positive) through a bottom-side socket on the right. | ||
| Case: | Fabulous thick plastic two piece case. Rear section in smooth dark brown and the front in smooth orange. with brushed aluminium keyboard surround. A black printed metallic label sits in its own recess stating the brand name. The neutral plastic display filter is slightly inset and flat. Inset just a little further is the aluminium keyboard surround printed with black text for the power switch. The keys are medium-travel, quite springy with a metallic ticking sound. | ||
| Display: | 8 digit blue VFD display with a ninth digit for negative and error indication. | ||
| Features: | Standard four function with percentages and change sign | ||
| Age: | 1976 | ||
| Manufacturer: | Made in Japan, serial number 101026 | ||
| Comments: | You can't help but like this calc. Typical brown and orange colour scheme from the 70s. Solid feeling although squishy keys are not so reliable. The logic is fair but let down by numerous negative zero bugs. The case is very like the First. |
| Components: | 1 x cpu: Matsushita M58618-81P
531J, 28
pin 0.6" width black plastic 1 x 9 digit VFD unit, glass tube round faced; Itron DP95A4 1 x transistor 5 x diodes 6 x capacitors 6 x resistors 2 x resistor arrays 1 x transformer: 7800 |
| Boards: | The keyboard assembly (Z-800 CA2010 - looks like a GICO) sits lose on top of the main cpu board and is connected via a 13-way ribbon cable. The main board sits in the rear section of the case and is held by two plastic lugs. |
| Construction: | There are three small lever slots on each side which can be used to prize away the front of the case, which then lifts off easily, hinging from the bottom. |
| Logic comments: | The Clear Entry key (CE) is used to clear an input number, the Clear (C) to completely reset the calculator |
| Input overflow is suppressed, keying in a ninth digit is ignored | |
| There is automatic constant on all four functions | |
| The negative sign is shown in the far left (ninth) digit thereby allowing full eight digit negative numbers | |
| Overflow shows the result and "C" (or "E" if negative) in the far left (ninth) digit and is recoverable using (C) | |
| Divide by zero shows zero and "C" in the far left (ninth) digit and is recoverable using (C) | |
| Change sign can be used in mid number entry and before | |
| It suffers the negative zero bug: key in (1)(-)(2)(=) to give "-1" then (+)(1)(=) to give "-0" | |
| It suffers the divide to negative zero bug: key in (1)(+/-)(=)(=)(=)etc until you get "-0" |
