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Calculators: Handheld: Adler 81CS (aka EC41) type II
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Size (approx): |
78mm
x 147mm x 15mm
(w,h,d) Weight 112g excluding batteries |
| Power: | 3.0V DC, 2 x AA size batteries. Also accepts adapter/charger (undefined) through a socket on the top side to the far left. | ||
| Case: | Slim tall (squeaky) case made from matt black plastic with a full front wrap around aluminium panel. The latter is printed with black text for the switch labels. Large display escutcheon is actually the front of the case showing through. And is printed silver with the make and model number. Small green display filter gives a very bright image. The upper escutcheon is so large as this is the section that sits under the PVC pocket in the originally supplied wallet. Colourful keys are soft but work well. | ||
| Display: | 8 digit green VFD with a ninth digit for error, memory and negative indication | ||
| Features: | 4 function calculator with percentages, delta percentage, change sign, powers, reciprocal, square root, pi and four function memory. Switch for summation of answers to memory. Switch for Floating/0/2/3 decimal points. On/off switch can also be set to “5/4” round down position. | ||
| Age: | 1977 | ||
| Manufacturer: | TA Vertriebs GmbH, D85 Nurnberg, Germany. Type EC 41, Serial No. on battery back 72321667 | ||
| Comments: | Quality calculator from Adler adopting the leading edge idea of a “wallet cover”. Host of features but this version unlike the Adler 81CS type I drops the RPN input key. The logic is sound with good recovery and no obvious bugs. This version of the 81CS appears to be the commonly available one. Judging by the lower serial number it looks like this preceded the type I. |
| Components: | 1x cpu: Hitachi HD37350 7E33
(May 1977) 28 pin DIL, 0.6" width, black plastic 1 x 9 digit VFD: single tube flat front face 2 x transistors 9 x diodes 5 x capacitors 4 x resistors 1 x transformer: 6A |
| Boards: | The main cpu board (Ebana P-011-1) is joined to the keyboard assembly with a short 23-way ribbon connector. The main board has a cut out section that allows the electrolytic capacitors to take up less depth. The whole assembly sits lose in the case. |
| Construction: | Very difficult top open as the two pieces are tight fitting and held together by strong lugs. I do not recommend you try as damage is highly likely. I found the best way was to squeeze in the rear section on the top edge. You can see the lugs inside the battery cover. Then try and do the same to the easiest side. Eventually the front or rear section will lift away. |
| Logic comments: | The (C) button is used to clear last entry of a number and pressed again to clear the whole calculator |
| Overflow on number input is suppressed; typing in a nine digit number ignores the last digit | |
| An overflow error displays the result and "C" in the far left (ninth) digit ("E" if negative) and is recoverable using (C) | |
| Divide by zero results in a "C" which is not recoverable | |
| There is automatic constant on multiply and divide only | |
| Negative numbers are flagged by a "-" sign in the far left (ninth) digit thereby allowing full eight digit negative numbers | |
| Memory store is indicated by the far left (ninth) digit decimal point | |
| A total accumulator for the memory can be switched on with the Σ switch | |
| The change sign function can be used in mid number entry | |
| Square roots of negative numbers are not allowed; the result is displayed with “E” in the far left (ninth) digit and is recoverable using (C) | |
| Another switch changes between floating decimal and fixed 0/2/3 decimal places | |
| The on/off switch can be pushed to the 5/4 (rounding) position rather than the default cut. |
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