Hanimex BCM-817

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Calculators: Handheld: Hanimex BCM-817

		Size (approx):	80mm x 138mm x 30mm (w x h x d) Weight 152g not including batteries.
		Power:	6.0V DC using 4 x AA size batteries. It accepts an adapter (6V 200mA) through a socket on the top side in the middle.
		Case:	The case is two-piece beige smooth plastic which is brick shaped with a rounded sides. The top end has a ridged design whilst the bottom end carries a metallic sticker with brand, model number and country of origin. A red display filter is slightly inset with black and white printed escutcheon and letter M. The display image is a little dull on my example with good angle of view. Just below the display a metallic sticker, printed black with the Hanimex branding, sits in its own recess. Another small metallic panel surrounds the two upper switches. The nearly flush keys are very short travel positive click type and work well.
		Display:	8 digit red LED (multi-dot flat type) with a ninth digit for constant, negative and error indication. There is a separate single red LED below the digits, in the middle for memory store indication.
		Features:	Standard four functions with percentages, three-function memory and switched constant. RPN logic.
		Age:	c1972-3
		Manufacturer:	Hanimex Group, made in Hong Kong, serial number 74200700
		Comments:	A very solid feeling calculator with nice LED display (though a little dim). Archaic logic, memory functions and single LED indicator have now long gone. I’m not sure why they bothered with the constant indicator as you can see it is on from the switch. The very nice case is stiffened black plastic in a box shape with the front hinging off to the right. It closes with two poppers on the left hand side and there is a carry strap. You can also use an adapter whilst the calculator is sat in its case, through a hole in the top. I believe there was a later version of this model with no constant switch and green VFD display. This is very similar in design to the Olympia CD51.

Components:
Boards:
Construction:	I cannot find a way of opening this as there is a screw underneath the bottom end label.

Logic comments:	The (CE) key is used to cancel an entry whilst the (C) key clears the whole calculator
	Input overflow is suppressed inputting a ninth digit is ignored
	Negative numbers are shown with a "-” in the far left (ninth) digit thereby allowing full eight digit negative numbers.
	There is switched constant [K] on multiply and divide. This is normally OK as the (+=) key usually acts like a constant – but not in this case. To remind you that constant is switched on the far left (ninth) digit’s decimal point lights.
	Divide by zero shows “C” in the far left (ninth) digit and is not recoverable
	Overflow shows the result and “C” (or “E” if negative) in the far left (ninth) digit and is not recoverable.
	When the memory is in use a small LED lights up to remind you.
	You can add to and subtract from the contents of the memory using (M+=) and (M-=) respectively. To recall (and simultaneously clear) the memory use the Total key (T).
	The logic is Reverse Polish Notation so to work out 5-2 you key in (5)(+=)(3)(-=) which shows “2”.