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Calculators: Handheld: Casio Mini-8 (aka Y-800)
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Size (approx): | 148mm x 72mm x 23.8mm(max)
(w,h,d) Weight 112g excluding batteries |
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Power: |
3V DC, 2 x AA size batteries. It accepts an adapter (AD-2S, 0.2W) through a socket on the top side to the far left. | |
| Case: | Horizontal format two-piece case in dark brown and light beige smooth plastic which is slightly wedge-shaped. The display area is raised and tilted slightly. The neutral display filter gives a clean bright image of the numbers and has two raised ridges that are printed white. A small inset panel houses a metallic label with reversed out company name and model number. An inset keyboard surround of brushed aluminium with typical Casio key frames. They keys are medium travel, squishy feel but work well. The back has another recess labelled "name" to place your own sticker. | |
| .Display: | 8 digit blue VFD, with no ninth digit for additional display. | |
| Features: | 4 function calculator with percentages and a CNG key(?) | |
| Age: | est. 1975 | |
| Manufacturer: | Casio Computer Company Ltd. Made in Japan, serial No. 2253409 (on battery cover) and 3474962 on the inside of the battery compartment. | |
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Comments:
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One of a range of early, solidly built horizontal calculators by Casio. The Mini name with some variations was used for a range of similar calculators so it is best to differentiate them with the model number if available. Sound logic but annoying seven digit negative numbers and lack of overflow recovery. |
| Components: | 1 x cpu: NEC uPD976C H5X056 28
pin DIL, 0.6" width 1 x 8 digit VFD display single glass tube; E6535A 5L6C3G 2 x transistors 4 x diodes 10 x capacitors 2 x SIL resistor arrays 5 x resistors 1 x transformer |
| Boards: | The keyboard board (ref B8R-E4A2) is attached to the front with five screws and to the floating cpu board (ref B8R-1A) via twelve strong wires. |
| Construction: | Despite the screw in the battery compartment this one is very difficult to open. I would advise against it for fear of damaging you calculator; my example has numerous screwdriver marks on the case joint.. However, if you really must, I found the best way was to pop the lugs on the left hand side first, there being one on the top, one each side and three on the bottom. The rear lifts away eventually. |
| Logic comments: | The (C) button is used to clear last entry of a number and the (AC) to clear the whole calculator. |
| Overflow on number input is suppressed, typing in a nine digit number ignores the ninth digit. | |
| An overflow error is flagged with the no answer just "E." in the first (right most) digit and is not recoverable. | |
| Divide by zero results in "E." being displayed in the first (right most) digit and is not recoverable. | |
| I have no idea what the (CNG) key does - it is not change sign. | |
| There is no constant function | |
| Negative numbers are shown by a "-" in the immediate left digit but as there is no ninth digit you are limited to seven digit negative numbers. |
