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Calculators: Handheld: Casio Mini Memory (dark keyboard version)
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Size (approx): | 156mm x 82mm x 30mm
(w,h,d) Weight 190g excluding batteries |
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Power: |
6V DC, 4 x AA size batteries. It accepts an adapter (AD-4145, 0.23W) through a socket on the top side about 1cm from the left. The on/off switch has a third position for "T", total. | |
| Case: | Horizontal format two-piece case in black and white smooth plastic. Inset display escutcheon in black plastic. A further inset panel has printed model number and reversed out Casio name. Large, long travel hollow sounding keys work well and a grooved (read dirt collection area) keyboard panel. Neutral display filter gives a bright display with odd "small zero" notation (see below). | |
| .Display: | 8 digit blue VFD, with no ninth digit for additional display. A shift-display key helps out. | |
| Features: | 4 function calculator with total, percentages and display shift for 16 digit precision. Total summation and decrement facility.. | |
| Age: | est. 1974 | |
| Manufacturer: | Casio Computer Company Ltd. Made in Japan, serial No. 2210??? (on battery cover) and 1060894 (inside battery compartment). | |
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Comments:
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One of a range of early, solidly built horizontal calculators by Casio. This one benefits from an eight digit display but strangely keeps the shift key. Logic is let down by unrecoverable errors, divide by zero and quirky memory system. It differs from the light keyboard model by the (partial) automatic constant facility. Original case is soft black plastic with top flap popper closing. It has Casio Embossed on the front and Made in Japan on the back. |
| Components: | |
| Boards: | |
| Construction: | Remove the single screw on the right hand side and very gently squeeze in the black section to release the lugs one by one. Not for the faint hearted - so do not attempt if you want to keep the calculator pristine. However, my example has a duff screw head so I cannot open it without drilling out the screw 8-(. |
| 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 answer displayed and viewable using the shift key (>) and is not recoverable | |
| Divide by zero error is ignored and calculation can continue with the zero result. | |
| There is automatic constant on multiply and divide only | |
| To add to the memory switch to "T" mode and every (=) signs adds to the memory. To subtract from the memory use the red (=) key. (AC) clears the memory and there is no indication - you have to remember it. | |
| Negative numbers are shown by a "-" in the immediate left digit. A result which is eight digits long and negative results in an unrecoverable error but you can see the answer by use of the shift (>) key. |
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Note the unusual way that zero is represented - by only using the lower half of the digit. |
