Sharp Elsimate EL-8114

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Calculators: Handheld: Sharp Elsimate EL-8114

	Size (approx):	82mm x 137mm x 25mm (max) (w,h,d) Weight 142g excluding batteries
	Power:	6.0V DC, 4 x AA size batteries. Also accepts an adapter (EA-14A or EL-97) through top end socket on the right, 0.55W. Quoted battery lifetime of 7 hours with manganese batteries.
	Case:	Flat two-piece plastic case in red smooth and black matt plastic. All the edges and corners are rounded giving it a nice feel in the hand. There is an oversized green display filter that wraps over the edges and fits flat and flush to give a nice bright image. A metallic sticker printed black and red sits in its own recess below the display. There is another metallic sticker, printed in black saying Made in Japan on the keyboard surround. In my experience this is liable to peeling over the years. They keys are short travel and squishy but work rather well. They are labelled with engraved shapes painted black.
	Display:	8 digit green VFD with a ninth digit for negative, memory and error indicators.
	Features:	Four function plus percentages, change sign, square root and three-function memory.
	Age:	c1975
	Manufacturer:	Sharp Corporation, Made in Japan. Serial number 51083138 on a sticker inside the battery compartment
	Comments:	Solid feeling standard calculator if a bit quirky with the red case. The logic is OK but recovery is poor and it have the "negative zero" bug. Odd use of the right-most digit for symbols. Black soft plastic cover is open topped with half-moon cut-outs on the top sides. It has Sharp embossed on the lower right front and made in Japan on the reverse.

Components:
Boards:
Construction:	Remove the screw from within the battery compartment and ... that's it - I cannot find a way to open this even though there is a clearly exposed lug in the battery area. Can anyone help?

Logic comments:	The (CE) key clears the last number entered whilst (C) clears the whole calculator
	Input overflow is suppressed, inputting a ninth digit is ignored
	There is automatic constant on multiply and divide only
	The change sign function can be used in mid number entry
	Negative numbers are shown by a "-" displayed in the far right (first) digit thereby allowing full eight digit negative numbers
	Divide by zero result in the display of "0.C" and is not recoverable
	Overflow results in the result and "C" (or "E" if negative) in the far right (first) digit and is not recoverable
	Negative square roots are not allowed and result in "0.C" and is not recoverable
	Memory store is indicated by the far right (first) digit's decimal point
	This calculator suffers the "negative zero" bug; try (1)(-)(2)(=) to give "-1" then (+)(1)(=) will give "-0"

manual

The manual measures 140mm x 90mm and is 32 printed pages. The cover is in pink and black whilst the inner pages are black and red. It is in English, French and German.

Printed in Japan, ref: E.G.F.