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Calculators: Handheld: Sanyo CX-8080A
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| Size (approx): |
82mm
x 155mm x 23mm
(w,h,d) Weight 148g excluding batteries |
| Power: | 6.0V, 4 x AA size batteries. It accepts an adapter (6V DC, 0.5W model CU-09) through a socket on the top side to the far left. It has a battery save function by switching off the full display after about 20 seconds. The battery compartment has a black ribbon pull to help remove the batteries. |
| Case: | Slab shaped calculator made from a three-piece beige and dark brown matt plastic case. The top and bottom end panels have a square ridged design. An oversized, neutral plastic display filter is flat and slightly inset and gives a clean bright image. This filter has embossed numeral numbers and error indicator “S”. The top section has is a small recess for a silver painted black plastic label with the brand name. The keyboard surround is a matching dark brown plastic panel with white printed text for the on/off switch label. The keys are medium travel, squishy, wobble a lot and in my example work poorly. |
| Display: | 8 digit blue VFD, with a ninth digit for minus, display off and error indication. |
| Features: | 4 function calculator with percentages and display recovery |
| Age: | 1974 |
| Manufacturer: | Made in Japan, serial number No. 5035890S |
| Comments: | Solidly built calculator but my example is made in Japan for the Japanese market as all the text on the back is in Japanese only. I cannot find another on the web so I imagine it was not issued in Europe or America. The logic is sound with good recovery and only let down by the pseudo fixed decimal bug. The original case is a very stylish looking dark blue felt with open top. |
| Components: | 1 x cpu: Texas TMS0851NC A 7429
(week 29 of 1974), 28
pin DIL, 0.6" width 1 x IC NEC µPD129C K3Y466, 16 pin DIL, 0.3" width 1 x nine digit VFD tube, round face single tube: Futaba 9-CT-08: NEC LD8035E 2 x transistors 4 x diodes 6 x capacitors 1 x resistor 1 x transformer block: 18W 4ZO CNV302 Sanyo Japan |
| Boards: | The main cpu board (MCL-8-1 R41X085A Japan 704) is fixed in with two plastic lugs and joins to the keyboard assembly via a 16-way ribbon connector. This is fixed to the front with 7 screws and two more lugs. |
| Construction: | You can see one of the internal plastic lugs from within the battery compartment 0 but it does not do you much good. The best way is to gently prize open the front whilst pushing in the rear section. Very stiff and difficult so if in doubt don't do it - damage may result. Eventually you can pop the side, top, side lugs and hinge off from the bottom edge. |
| Logic comments: | The (C) button is used to clear last entry of a number whilst a second press clears the whole calculator. |
| Overflow on number input is suppressed as inputting a ninth digit is ignored | |
| An overflow shows the result with a “C” (or “E” if negative) in the far left (ninth) digit and is recoverable using (C) | |
| Divide by zero results in zero and a "C” in the far left (ninth) digit and is recoverable using (C) | |
| There is automatic constant on all four functions | |
| Negative numbers are shown by a "-" in the immediate left hand digit, travelling into the far left (ninth) digit thereby allowing full eight digit negative numbers. | |
| The (DR) key is used to recover the battery save function: after 20 seconds the display switches off except for a “-“ in the far left (ninth) digit | |
| It suffers the pseudo fixed
decimal bug: key in (1)(+)(0)(.)(0)(0)(0)(=) to give “1.000” which
remains a three digit fixed decimal number until more digits are needed or
multiply or divide are used |
