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Calculators: Handheld: Adler 82M (aka EC26)
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| Size (approx): | 74mm
x 117mm x 20mm (w,h,d) Weight 132g excluding batteries |
| Power: | 6V DC, 4 x AAA size batteries. Also accepts adapter/charger (undefined but 6V DC centre negative) through a socket on the bottom side to the far right. |
| Case: | The main body is made from two pieces of black matt and smooth plastic. This is surrounded by a “U”-shaped aluminium rear that wraps around the sides. Ridges are featured on the sides to aid grip. This piece can slide up and down to get access to the battery compartment and eventually, to dismantle the whole calculator. A recessed and tilted green plastic display filter gives a very bright display. Below the display is a black printed metallic sticker that sits in it own recess. The keys are quite squishy with medium length travel and a soft click. The matt keyboard surround is printed with white text for the switch and key labels. The top side has the brand name printed in white text. |
| Display: | 8 digit green VFD with a ninth digit for negative and overflow indication. |
| Features: | 4 function calculator with conversion factors and four function memory |
| Age: |
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| Manufacturer: | T-A Vertriebs GmbH, D8500 Nurnberg, Germany. Type EC 26, Serial No. 68.002.749© |
| Comments: | Unusual slide out design clear display and weighty quality-feeling calculator. Button colours are a bit of a jumble. Useful set of extensive conversion functions and good recovery is only let down by the pseudo fixed decimal bug. The original case is stiffened black plastic with open top and square cut-outs either side. Whilst the IC is date coded late 1974, the keyboard assembly is 18 August 1975 and the display July 1975. |
| Components: |
1 x CPU: Rockwell A4004PC 7448 (date code week 48 of 1974), 42 pin
staggered DIL,
0.6" width black ceramic with round metal cover 1 x 9 digit VFD; single tube flat face: Futaba ? 5G (date code July 1975) 2 x transistors 6 x diodes 7 x capacitors 7 x resistors 2 x resistor arrays 1 x transformer: DCT 04 |
| Boards: | The keyboard assembly (GK-135-7J 82M K-2 GICO 50.8.18) sits on top of the battery compartment and is attached to the main cpu board (84F-Ca) below with a 17-way ribbon cable. This whole assembly sits lose in the case but attached by wires to the battery compartment. |
| Construction: | Remove the u shaped metal back piece by gently sliding it all the way off. Then remove the two screws from either side. The front of the case will then lift off easily. |
| Logic comments: | The (C) key is used one to cancel the last number entered whilst a second press will clear the calculator |
| Overflow on number input is suppressed, keying in a ninth digit is ignored | |
| There is automatic constant on all four functions | |
| An overflow error shows the result and all decimal points on and “n" (“o” if negative) in the far left (ninth) digit and is recoverable using (C) | |
| Divide by zero results in "0.0.0.0.0.0.0.0." and “n" in the far left (ninth) digit and is recoverable using (C) | |
| Negative numbers are flagged by a "-" sign in the fare left (ninth) digit thereby allowing full eight digit negative numbers | |
| There is no indication of memory - you have to remember it | |
| Memory use is a two key stroke process: store by (M)(+) or (M)(-), recall by (M)(=) and clear by (M)(C) | |
| The conversion function is easy: to convert one inch to mm key in (1)(CONV)(inch)(mm) to give "25.4" | |
| There are extra switches to set between Land and Nautical distances and US and Imperial measurements | |
| It suffers the pseudo fixed decimal bug: key in (1)(+)(.)(0)(0)(0)(=) to give "1.000" which remains a fixed three decimal number until you need more digits or you use multiply or divide |
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