Prinztronic SC4001M

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Calculators: Handheld: Prinztronic Scientific SC4001M

	Size (approx):	75mm x 144mm x 35mm (max) (w,h,d) Weight g excluding batteries
	Power:	6V DC, 4 x AA size batteries. Does accept an adapter (DC 6V 100mA) through socket on the right side three quarters of the way up.
	Case:	Two-piece case with black matt plastic base and smooth cream plastic top. Inset metal keyboard surround is painted very dark brown to match the display surround, which is painted plastic. A further coat of silver is used for the logos and key labels. Titled and slightly shrouded green display filter give a bright image even in daylight.
	Display:	8 digit green VFD, ninth digit for minus sign, memory and error flags
	Features:	Standard four functions, percentages, square root, inverse, pi, logarithms, trigonometric functions and five function memory. Degree / Radians switch. Normal / Scientific switch.
	Age:	197?
	Manufacturer:	Prinztronic, made in Taiwan. Battery compartment labels say Model 1448, Serial No. 967562.
	Comments:	Straight lines and solid build make this an appealing calculator. Simple scientific button layout is also very good. Display of numbers is from the left rather than the usual right hand side of the display. Good very bright VFD (even if it does read the wrong way). Sound logic but takes up to three seconds for a trig function. Original case is soft black plastic with top and side zipper and a rather tight fit.

Components:
Boards:
Construction:	Whilst there are two screws in the battery compartment. There is another under the rear model label. Until I find an example with a duff label I will never know.

Logic comments:	(C) is used once to clear the last number entered and a second time to clear the whole calculator.
	There is automatic constant on all four functions
	Input overflow is suppressed, inputting a ninth digit is ignored
	Negative sign is shown in the far left (ninth) digit to allow full eight digit negative numbers
	Divide by zero shows zero and "E" in the far left (ninth) digit and is not recoverable
	Overflow is shown by "E" in the far left (ninth) digit along with zero as the result and is not recoverable
	Negative square roots are not allowed and result in zero and "E" in the far left (ninth) digit.
	Memory store is flagged using one of the lower vertical segments of the far left (ninth) digit.
	To see an extra digit of precision try this; enter "0.999999" as a number then (SqRoot) to get "0.9999994" then (N <> S) and again (N <> S) will show the number shifted left by one decimal point with no decimal point "99999949". Pressing (=) restores the display.