Adler 81SN EC63

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Calculators: Handheld: Adler 81SN (aka EC63)

		Size (approx):	74mm x 135mm x 15mm (w,h,d) Weight 90g excluding batteries
		Power:	4.5V DC, 3 x AAA size batteries. Also accepts adapter/charger (AD70-75 and UA 198) through a socket on the top side to the far left. Remove normal batteries if using an adapter. Charge time is quoted as 14 hours.
		Case:	Slim tall case made from matt black plastic with a full front wrap around aluminium panel. The latter is printed with black text for the switch label. 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 wallet. Colourful keys are soft but work well.
		Display:	8 digit green VFD with a ninth digit for error, memory and negative indicators
		Features:	Four function calculator with percentages, change sign, square root, pi, register exchange and four function-memory. The on/off switch can be set on floating or fixed 2/3 decimal mode.
		Age:	1978
		Manufacturer:	TA Vertriebs GmbH, D85 Nurnberg, Germany, serial number 72880824 is on a sticker on the inside of the battery compartment cover.
		Comments:	Quality calculator from Adler adopting the leading edge idea of a “wallet cover”. However, just to be different the holding pocket is at the top not the bottom, which was more common. The logic is sound with good recovery and only let down by negative square roots. The original case is black stiff plastic with a PVC pocket on the left for the calculator and one on the right, presumably for the manual.

Components:	1x cpu: Texas TMS1045NL 7823 (week 23 of 1978), 28 pin DIL, 0.3" width black plastic 1 x 9 digit VFD unit, single glass tube, flat faced 2 x transistors 8 x diodes 5 x capacitors 6 x resistors 1 x transformer
Boards:	The keyboard assembly sits lose on top of the main cpu (P-0026-00) board. They are joined by 16 strong short copper wires. The main board has a cut-out on the edge to allow the four large capacitors to take up minimum width.
Construction:	Extremely difficult to open as it is held together by internal lugs only and the narrow sides are very stiff. I would not try to open one of these for fear of damage. If you must, I found the best was to start at the top edge as you can just see the first lug inside the battery compartment. The front will eventually come off.

Logic comments:	The (CI) button is used to clear the last entry of a number and (C) to clear the whole calculator
	Overflow on number input is suppressed; typing in a ninth digit is ignored
	An overflow error displays the result and "C" ("E" if negative) in the far left (ninth) digit and is recoverable using (CI).
	Divide by zero results in zero and a "C" in the far left (ninth) digit and is recoverable using (CI).
	There is automatic constant on all four functions
	Negative numbers are flagged by a "-" sign in the fare left (ninth) digit thereby allowing full eight digit negative numbers.
	Memory store is indicated by a "ⁿ" in the far left (ninth) digit .
	Overflow in memory holds the result but out by a factor of 10⁸
	The change sign function ( (-) ) can be used in mid number entry but not before
	Square roots of negative numbers are allowed and result in a negative number
	You can switch between floating [F] or fixed two/three digit decimal [2/3] modes
	The (X-Y) key allows you to exchange registers
	No bugs found

The manual measures 124mm by 71mm and consists of 32 black and white pages. It has four languages (German, English, French and Italian). Good clear examples are given for all functions.

Printed in Japan, reference number 1030.0035.6.78.