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Calculators: Handheld: Casio Personal-mini (aka CM-606 I think)
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Size (approx): | 143mm x 69mm x 25.5mm
(w,h,d) Weight 134g excluding batteries |
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Power: |
3V DC, 2 x AA size batteries. It accepts an adapter (AD-2S, 0.18W) through a socket on the top side just to the right of the display. | |
| Case: | Horizontal format two-piece case in black and white matt plastic. Inset display escutcheon in black plastic. A further inset panel has printed model number and reversed out Casio name. There are two highlighted ridges around the display area that are printed white. Large, long travel hollow sounding keys work well. Neutral display filter gives a rather dull image with odd "small zero" notation (see below). | |
| .Display: | 6 digit blue VFD, with no seventh digit for additional display. A shift-display key helps out. | |
| Features: | 4 function calculator with display shift. | |
| Age: | estimate 1975 | |
| Manufacturer: | Casio Computer Company Ltd. Made in Japan, serial No. 5344389 (on battery cover) and 4118969 (inside battery compartment). This may be a spare battery cover on my sample. Oddly enough, the information panel on the back is upside down. | |
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Comments:
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One of a range of early, solidly built horizontal calculators by Casio. The Personal-mini name was used for another similar one, but this model does not have a "CM" number to identify it. Quirky logic and annoying display (often to save money) is made up by the wonderful divide by zero bug! |
| Components: | 1 x cpu: NEC µPD178C H49556 28
pin DIL 1 x 6 digit VFD display single glass tube 0 x transistors 0 x diodes 12 x capacitors 2 x SIL resistor arrays 7 x resistors 1 x transformer: TDK CD-14202 4ZC Japan |
| Boards: | The keyboard board (ref 6V-E4A) is fixed to the front via five screws and to the main cpu board (ref 6V-1A) by 9 stiff wires. The latter is L-shaped to avoid the battery compartment. |
| Construction: | Remove the single screw in the battery compartment and very gently squeeze in the white 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. |
| 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 seven digit number ignores the seventh digit. | |
| An overflow error is flagged with the answer displayed and viewable using the shift key (>) and is not recoverable | |
| Divide by zero results in "000000" being displayed - but use the shift key to see the clock running! It is not recoverable. | |
| There is automatic constant on all functions | |
| Negative numbers are shown by a "-" in the far left sixth digit until it gets too big where you will see it on the first digit of the shift display |
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Note the unusual way that zero is represented - by only using the lower half of the digit. |
