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Calculators: Handheld: Adler 80S (aka EC 22B)

Size (approx): 75mm x 120mm x 20mm  (w,h,d)
Weight 128g excluding batteries

Power:

6V DC, 4 x AAA size battery.  Also accepts adapter (undefined).  Socket is on bottom side on the right.  Socket is 2mm jack-plug, centre negative.
Case: Square case with back and sides made of one piece of brushed aluminium.  Dark brown plastic calculator body slides down nearly half way to reveal battery compartment.  Pronounced ridges on the side to aid grip.  Squishy but positive action buttons.  Logo and model number is printed on inset aluminium panel.  Logo is also painted on the top side.  The green, slightly sloping display filter gives a clean bright image.
Display: 8 digit green VFD (ninth digit for error and negative flags)
Features: 4 function calculator with percentages, pi, square root and change sign.
Age: est. 1975/6
Manufacturer: TA Vertriebs GmbH, D8500 Nurnberg, Germany.  Type EC 22B, Serial No. 68.158.956
Comments:

 

Unusual slide out design clear display and weighty quality-feeling calculator.  Button colours are a bit of a jumble. Otherwise sound logic let down by negative square roots and no input overflow suppression.  Black plastic case is open topped, rigid front and back and very square in design.
 

Components: 1 x cpu: NEC D1801C H63096 28 pin DIL
1 x flat faced glass encapsulated nine digit VFD display
2 x transistors
6 x diodes
6 x capacitors
3 x resistors
1 x transformer: DCT 40
Boards: The keyboard board is held onto the keyboard via 12 screws and joined to the cpu board (Ref. T-80Sa-801S) via 15 stiff copper wires.
Construction: To open, gently force the "U" shaped aluminium back fully off.  Then gently prize off the top back and bottom two side lugs.  The whole calculator then lifts off the front panel.

Logic comments: The (Cl) button is used to clear last entry of a number and (C) to clear the whole calculator
Overflow on number input is not suppressed, typing in a nine digit number results in a "C" in the ninth digit, but it is recoverable using (Cl)
An overflow error is flagged by a "C" in the ninth digit, "E" if negative.  It is recoverable using (Cl).
Divide by zero results in a  "C" which is not recoverable.
Negative square roots are allowed.
There is automatic constant on all four functions 
Negative numbers are flagged by a "-" sign in the ninth digit.