Unisonic 1511L

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Calculators: Handheld: Unisonic 1511L

	Size (approx):	74mm x 147mm x 21mm (max) (w,h,d) Weight 104g excluding batteries
	Power:	3.0V DC, 2 x AA size batteries. Accepts an adapter/charger (undefined) through a socket on the top side, on the far right.
	Case:	Cheap looking calculator made of a two-piece black smooth plastic case. It has two large brushed aluminium panels that practically cover the whole front. Printed brand and model on the top section tends to suggest there should have been a similar "on" indicator that has not survived on this example. Titled wrap-around red display filter gives a very bright display. The keys are very short travel soft click but still work very well.
	Display:	8 digit red LED with bubble lens and a ninth digit for negative indication
	Features:	Standard four functions with percentages, change sign and register exchange
	Age:	est. 1978
	Manufacturer:	No markings on this model but there is an empty recessed panel on the back.
	Comments:	Not very attractive utility calculator that compensates somewhat by the good display and sound logic.

Components:
Boards:
Construction:	Cannot find an easy way to open it has the sides are too stiff to easily pop off the internal lugs.

Logic comments:	The (C/CE) key is used to cancel an entry whilst a second press clears the whole calculator
	Input overflow is suppressed inputting an 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 automatic constant on all four functions
	Divide by zero shows "0.0.0.0.0.0.0.0." and is recoverable using (C/CE)
	Overflow shows the result with all decimal points alight and is recoverable using (C/CE)
	To see a display anomaly try (1) (-) (0.0000000) (=), this gives "1.00000000" which keeps the trailing zeros until you multiply or divide by something.