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Calculators: Handheld: Olympia CD40
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Size (approx): |
80mm x
125mm x 20mm
(w,h,d) |
| Power: | 3.0V DC, 2 x AA size batteries, 0.3W. It accepts an adapter (DC 3V) through a socket on the right in line with the (D) key. | ||
| Case: | Compact two-piece black matt plastic with rounded top and bottom edges. It is dominated by a large front brushed aluminium panel that rolls over the top and bottom edge. It is slightly recessed and printed black and orange. for the brand, logo on/off switch label and some designer lines. The green plastic display filter is flat and slightly raised and gives a very bright image. The keys are very Casio-like, medium travel squishy with a soft click, and each surrounded by a plastic escutcheon. | ||
| Display: | 8 digit green VFD, with a ninth digit for minus, error and power save indicators | ||
| Features: | 4 function calculator with percentages and display power save | ||
| Age: | 1975 | ||
| Manufacturer: | Olympia Werke AG, Wilhelmshaven, Western Germany, made in Japan, serial number 921671 | ||
| Comments: | Very high quality feel to this compact and stylish calculator made all the better by the bright display. The logic is very sound with good recovery, useful power-save function and only let down by the pseudo fixed decimal. |
| Components: | 1 x cpu: Texas TMS0851NC 7535
(date code week 35 of 1975), 28
pin DIL 0.6" width, black plastic 1 x 9 digit VFD single tube round face: NEC LD8122 2 x transistors 4 x diodes 7 x capacitors 21 x resistors 0 x resistor array 1 x transformer: 509 |
| Boards: | The main cpu board (45-422A) sits lose in the rear of the case with a 15-way gang of wires connecting to the keyboard assembly (50.9.26 2). The latter is fixed to the front with eight screws. |
| Construction: | Very difficult top open as it is held together by internal lugs only and the case sides are very stiff. Damage is easily done, so if in doubt do not open it. I found the best way was to carefully lever the top edge (where the coin slot is), levering out the rear section. Then travel down the sides levering out the front section. Mine took twenty minutes to even start to open - seriously, don't bother. |
| Logic comments: | The (C) button is used to clear last entry of a number and a second press clears the whole calculator. |
| Input overflow is suppressed, inputting a ninth digit is ignored | |
| 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 | |
| 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 a tall "C” in the far left (ninth) digit and is recoverable using (C) | |
| After about 20 seconds the power save mode kicks in and the display just shows "-" in the far left (ninth) digit. You can retrun to calculations by pressing the (D) display recovery key | |
| It suffers the pseudo fixed decimal bug: key in (1)(+)(.)(0)(0)(0)(=) to give "1.000" which will remain a fixed three decimal digit number until more are needed or you use multiply or divide |
