Hanimex ESR800

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Calculators: Handheld: Hanimex ESR800

	Size (approx):	80mm x 137.5mm x 30.5mm (w,h,d) Weight 134g excluding batteries
	Power:	6V DC, 4 x AAA size batteries. Does accept an adapter (undefined but 4mm plug, centre positive, 6V 300mW) through socket on the top side to the far left. Zinc-carbon batteries are quoted as a 4-5 hour battery life whilst alkaline-manganese as 20 hours.
	Case:	Solid two-piece case made from black and silver matt plastic. Large wrap around display window is painted black on the inside and is almost clear - showing the digits clearly. Company name and model number is painted on in white. Commodore-style key colours on squashy but positive keys. The top left has a blanking plate inserted as this key position is not used.
	Display:	8 digit blue VFD, with a ninth digit for memory indication, minus and error signs.
	Features:	Standard four functions, percentages, sign change, squares , square roots and five function (two key stroke) memory. Has exchange function that can be used on constant operator or memory. Switch for floating, 4/2 digit decimal point with "$" setting for money input.
	Age:	1975
	Manufacturer:	Hanimex Group Companies, made in Hong Kong. Serial No. 51034374
	Comments:	Attractive well made calculator with flexible functions and sound logic (except for negative square roots). Original case is soft black plastic with flip over and tuck in top flap.

Components:	1 x cpu: Rockwell A4641PA 7525 (date code week 25 of 1975) 42 pin staggered DIL 1 x 9 digit flat face single tube VFD display 2 x transistors 3 x diodes 7 x capacitors 2 x resistor arrays 7 x resistors 1 x transformer
Boards:	The keyboard board is attached to the front with 11 screws and connected to the main board via 13 loose wires. The latter is fixed to the back with one screw and a plastic lug.
Construction:	Remove (very small) screw from the back. Gently squeeze the front piece at the sides about midway to release the lugs.

Logic comments:	(C) is used once to cancel 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 numbers are shown with a "-" in the far left (ninth) digit allowing eight-digit negative numbers
	The change sign key can be used in mid-number entry
	Negative square roots are allowed
	Divide by zero shows "o" in the far left (ninth) digit and is recoverable using (C)
	Overflow shows the result with "0" in the left most (ninth) digit and is recoverable using (C)
	The register exchange key (<>) can be used either to exchange the display for the constant operator or the memory in conjunction with the (M) key
	Memory functions use a two key sequence (M)(+) will add to the memory. Used with (+)(-)(=)(C)(<>)
	Memory is indicated by the far left (ninth) decimal point
	A switch can be used to set the decimal point floating, four or two decimal points. Setting it to "$" inputs number in financial format; i.e. inputting (4)(5)(6) results in 4.56.

Picture on the left shows oversized, open-sideways box printed in full colour. It is approximately 185mm x 115mm x 50mm (h x w x d). One end has the code no. 28-1046(3) but there is no country of origin.

The manual pictured left is 115mm x 72mm 16pp. The cover is three colour whilst the inside pages are one colour black. The second page has a diagram of the calculator for description but has a sticker over the "Power Switch" and "Change sign" descriptors. You can just see underneath that these labels were inverted. Clearly written with plenty of examples but there is no reference number or country of origin.