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Calculators: Handheld: Casio FX-110
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| Size (approx): | 84mm
x 152mm x 22.5mm (max) (w,h,d) Weight 144g excluding batteries. |
| Power: | 3.0V DC, 2 x AA size batteries, 0.75W. Also accepts adapter/charger (AD-4145) through a top side socket on the left. |
| Case: | Smooth plastic white base and black top. Inset brushed aluminium panels around keyboard and above display. Neutral and slightly tilted plastic display filter gives a clean image. Logo, brand and key functions are printed in black, blue and dark orange. On off switch located perfectly on left side about 2cm from the top. Subtle black and grey keys with only two highlighted in orange. Squishy but positive keys. |
| Display: | 10 digit blue VFD with an eleventh digit for negative exponent indication. The far left (twelfth) digit is never used. 8+2 scientific mode. |
| Features: | Four standard functions, reciprocal, factorial, square root, squares, logs, powers, nth root, change sign, sexagesimal display, trigs (including hyperbolic), decibels, pi statistical and three function memory. Switched Degree, Radian, Gradian and Standard Deviation modes. |
| Age: | 1977 |
| Manufacturer: | Casio Computer Co. Ltd. Made in Japan, serial number 4477555 on a sticker in the battery compartment. |
| Comments: | Fabulous quality calculator from a famous range. As they got it so right, this layout remained for years - well into LCD calculators. This model has the rare decibel function and strange non-use of the extra digit. Displays sexagesimal angle separator with "0". The logic is sound enough but let down by the lack of recovery and limited precision on scientific functions. Misleading change sign key, lack of fractions and parentheses along with simple memory are also a bit disappointing. Supplied originally with an open topped soft plastic case with Casio logo embossed on front. |
| Components: | 1 x cpu: Hitachi HD36134 7D33
(April 1977), 28 pin DIL, 0.6" width black plastic 1 x 12 digit VFD display, flat faced single tube; Toshiba E6607 6L 3 C (November 1976) (aka LD8197) 3 x transistors 11 x diodes 8 x capacitors 6 x resistors 1 x transformer: TDK CD-1256 3C3 |
| Boards: | The Keyboard assembly is fixed to the front by five screws and attached to the cpu board (A10N-1 A GCMK-19EHB) via 20 copper wires in two bunches. |
| Construction: | Remove the single screw for the battery compartment. Still quite difficult to open. Open the lug visible to the left of the compartment by gently pushing in the brown plastic front. There are two further lugs on each side that are very difficult to pop as the plastic sides are so stiff. Warning - very likely to damage it so my advice is not to bother. Hinge off the back to the right. |
| Logic comments: | The Clear key (C) is used to clear an input number, the all-clear (AC) to completely reset the calculator. |
| Overflow on the input of a number is suppressed, typing in an eleventh digit is ignored | |
| The constant function is invoked for all four functions by a double press of the operator. | |
| There is no indication of memory use - you have to remember it. | |
| The negative sign is to the immediate left of a number, it can push to the eleventh digit to allow 10-digit negative numbers. However in scientific mode you are limited to seven digit negative mantissas. | |
| On overflow the display just shows "E" in the far right (first) digit and is not recoverable. | |
| On divide by zero the display just shows "E" in the far right (first) digit and is not recoverable. | |
| Negative square roots are not allowed and result in an error as above | |
| Standard scientific mode is eight digits plus two exponent with one intervening extra digit for negative indication of the exponent | |
| The change sign function can be used in mid number entry but not before but looks like a key for parenthesis | |
| Scientific functions are limited to eight digits of precision only | |
| Degrees (or hours), minutes and seconds can be displayed and manipulated by entering (4)(o ' ")(3)(o ' ")(2)(o ' ") which will display the decimal notation "4.050555555". Use (INV)(o ' ") to convert the display to "4o 03o 02." | |
| Internal precision is up to eleven digits, through pi is held to ten and trigs to eight. To see the extra digits try (9)(1/X) to give "0.111111111" then (-)(0.111111111)(=) will give "1. x 10 -10) | |
| The (dB) key is used to convert decibels (i.e. 20log(x) ) | |
| No major bugs found. |
