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Calculators: Handheld: Sanyo CX-8136
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Size (approx): |
76mm
x 125mm x 22mm (max) (w x h x d) |
| Power: | 3.0V DC using 2 x AA size batteries. It accepts an adapter (2.8V, 0.3W, CU-20) through a socket on the top side to the far right. | ||
| Case: | The case is two-piece smooth and matt light and dark grey plastic with rounded edges and corners. A large white printed dark aluminium panel surrounds the display, the whole area being slightly tilted. The green and slightly proud display filter gives a clean bright image. It has a black painted border, which adds to the quality look. They keys are squishy with an ever so soft positive clunk. The on/off switch is labelled with raised lettering and the keyboard surround is dark grey matt plastic. | ||
| Display: | 8 digit green VFD with a ninth digit for negative, memory and error indicators. | ||
| Features: | Standard four functions with percentages, change sign, square root, and three function memory. | ||
| Age: | 1976 | ||
| Manufacturer: | Sanyo Electric Company Ltd, made in Japan. Serial number 09004908 is on a sticker on the rear. | ||
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Comments:
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Quite well made compact calculator, that has a similar case design to the Sanyo CX-1032 . The logic is a bit dodgy with no recovery and the percentage to zero bug. Unusual symbol for the sign change key. There was a similar model: the CX-8136NE with three memory function keys. |
| Components: | 1 x cpu; NEC µPD277C H5Z55M
(possibly date coded end of 1975), 28 pin DIL, 0.6" width black
plastic 1 x 9 digit VFD display; single glass tube round face: Futaba 9-CT-24-6D (April 1976) 3 x transistors (C356 G6A and D545 F6G) (date code June/July 1976) 5 x diodes 9 x capacitors 6 x resistors 1 x resistor array 1 x transformer: 319A |
| Boards: | The main cpu board (B-1 R-4171171) sits above the keyboard assembly and is joined by a 17-way ribbon connector. It is secured by two plastic lugs. The keyboard (911 1A) is attached to the front with five screws. |
| Construction: | Remove the single screw from the back. Gently lever out the sides so that you can pop the two side lugs about 2/3 the way up - squeeze in the front section to help. Then gently hinge the rear section about the top to release two more lugs - Quite difficult to if in doubt do not force it. |
| Logic comments: | The (C) key is used once to cancel an entry whilst a second press clears the whole calculator |
| Input overflow is suppressed inputting an ninth digit is ignored | |
| Negative numbers are shown with a "-” in the far left (ninth) digit, thereby allowing full eight digit negative numbers. | |
| There is automatic constant on multiply and divide only | |
| The change sign can be used in mid number entry but not before | |
| Overflow shows the result and “C” (or “E” if negative) in the far left (ninth) digit and is not recoverable | |
| Divide by zero shows the zero and “C” in the far left (ninth) digit and is not recoverable | |
| Negative square roots are not allowed and result in zero and “C” in the far left (ninth) digit and is not recoverable | |
| Memory store is indicated by the decimal point of the far left (ninth) digit | |
| Memory overflow retains the original number | |
| Clearing memory is done by pressing the (MRC) key twice | |
| The (%) key divides by zero in isolation: try repeatedly pressing is in a sequence such as (1)(%)(%)(%) etc to eventually get "0.0000000" | |
| No other bugs found |
