Sharp Elsimate EL-8005S

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Calculators: Handheld: Sharp Elsimate EL-8005S (black and red)

		Size (approx):	85mm (max) x 137.5mm x 26mm (max) (w,h,d) Weight 140g excluding batteries
		Power:	6.0V DC, 4 x AA size batteries. Also accepts an adaptor (EA-14A, centre negative) through top side socket on the right, 0.45W.
		Case:	Unusual two-piece plastic case in red smooth and black matt plastic. The whole thing is shaped rather like a pint glass but fits in the hand quite comfortably. There is a very large green display filter that wraps over the top and gives a nice bright image. A metallic sticker printed black and red sits in its own recess in this filter. There is another metallic sticker, printed in black saying Made in Japan on the keyboard surround. The 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 and error indicators.
		Features:	Four function plus percentages.
		Age:	1975
		Manufacturer:	Sharp Corporation, Made in Japan. Serial number 52264335 (also own 52176749) on a sticker inside the battery compartment
		Comments:	Basic calculator that was obviously a design experiment, as no one copied it and its successor went back to normal. A blue and white version was also available and it appears that some were made in Japan, others in Korea. The keyboard layout makes it look like there is a button missing. The logic is poor but with good recovery and odd use of the right-most digit for symbols. Black soft plastic cover is open topped with half-moon cut-outs on either side. It has Sharp embossed on the lower right front and made in Japan on the reverse.

Components:	1 x cpu: Sharp LI2008 5G2 019 (week 2 of July 1975), 28 pin DIL 0.6" width 1 x 9 digit VFD; single tube round faced 1 x transistor 8 x diodes 8 x capacitors 4 x resistors 2 x resistor arrays 1 x transformer; TDK 1279 Japan
Boards:	The main cpu board (F1265) is held in place by a screw and two plastic lugs above the keyboard assembly. The keyboard is attached to the front with one screw and to the main board with a 17-way ribbon cable. The back of the keyboard assembly forms the inside of the battery compartment. There is a large piece of black paper surrounding the display to cut out light and reflections,
Construction:	Remove the screw from within the battery compartment and push out the lug that is clearly visible at the bottom of the compartment. The whole back the lifts off, hinging from the top.

Logic comments:	The (CE) key clears the last number entered whilst (C) clears the whole calculator
	Input overflow is not suppressed, inputting a ninth digit causes and overflow which is recoverable using (CE)
	There is automatic constant on multiply and divide only
	Negative numbers are shown by a "-" displayed in the far right (first) digit thereby allowing full eight digit negative numbers
	Overflow results in the result and "C" (or "E" if negative) in the far right (first) digit and is recoverable using (CE)
	Divide by zero result in the display of "0.C" and is recoverable using (CE)
	There is no trailing zero suppression on the result of a division: (5)(/)(2)(=) gives "2.5000000"
	It suffers the pseudo fixed decimal bug: (1)(+)(.)(0)(0)(0)(=) gives "1.000" which remains a three digit fixed decimal until more are needed (even after a multiplication), but of course is reset as above after a division