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Calculators: Desktop: Casio 103-MR
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| Size (approx): |
100mm x
160mm x 27-34mm (w,h,d) |
| Power: | 6V DC using 4 x AA size batteries. It accepts an adapter (DC 6V 0.3W AD4145) through a socket on the top side to the middle left. |
| Case: | Large desktop calculator that just about fits in the hand. The base is made from light beige smooth plastic, the top from black matt plastic. A neutral, tilted display filter has two white painted lines and gives a clear display. A large brushed aluminium panel dominates the from and is printed with black text for the brand, model number and switch labels. The keys are typical Casio squishy action but on this they sound quite hollow. |
| Display: | 10 digit blue VFD with no eleventh digit (even though it is physically there) |
| Features: | Standard four functions with square root and three-function memory. Switches for rounding and decimal places. |
| Age: | 1975-6 |
| Manufacturer: | Casio Computer Co., Ltd., made in Japan. Serial number (inside battery compartment) 1047842. |
| Comments: | Sturdy and well built calculator using a tried and tested design formula. The logic is fine but the lack of error recovery and negative square roots let it down. |
| Components: | 1 x cpu; Hitachi
HD3692 5F32 (June 1975), 40
pin DIL, 0.6" width 1 x IC: HD3233P 6B 43 (February 1976), 16 pin DIL, 0.3" width 1 x 11 digit VFD unit; single tube round faced NEC LD8126 2 x transistors 5 x diodes 23 x capacitors 7 x resistors 5 x resistor arrays 1 x transformer |
| Boards: | The main board (A10B-1A) sits piggy-back on top of the keyboard assembly (A10B-E4A) and is connected via a 23-way stiff banded connector. The keyboard assembly is held to the front with four screws and amazingly has 7 jump wires in order to complete the keyboard matrix circuit. There is a mini piggy back board that holds the voltage doubling circuitry. |
| Construction: | Remove the screw from the rear and the one inside the battery compartment. The back section will lift off after a bit of gentle persuasion - hinge it from the top where the power socket sits |
| Logic comments: | (C) clears the last number entered and (AC) clears the whole calculator |
| Input overflow is suppressed, inputting an eleventh digit is ignored | |
| There is selectable constant on multiply and divide only by double hitting the operator; i.e. (5)(X)(X)(=) gives "25" (=) gives "125" etc. | |
| Negative numbers are shown by a minus sign in the digit to the immediate left of a number but as there is no eleventh digit to travel into you are limited to nine digit negative numbers | |
| Divide by zero shows "E" in the first (far right) digit and is not recoverable | |
| Overflow shows "E" in the first (far right) digit and is not recoverable | |
| Memory store is not indicated - you have to remember it! | |
| Memory overflow will result in an error and zero the memory | |
| Negative square roots are allowed and result in a negative number | |
| There is a switch selecting 6,4,3,2,1,0 fixed decimal points | |
| Another switch selects between floating decimal point [F], fixed round down [CUT] and fixed round [5/4] |
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