Texas Instruments TI-2550 III

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Calculators: Handheld: Texas Instruments TI-2550 III

	Size (approx):	80mm (max) x 147mm x 32mm (max) (w,h,d) Weight 170g including batteries.
	Power:	Undefined, but uses a fixed rechargeable battery pack in the battery compartment - one unit integrated into cover. Uses charger BP-3 which is plugged into a socket on the top side, far left.
	Case:	Two piece matt black case with gold painted trim - rubbed off in places. Brushed aluminium keyboard surround is coloured gold. Extra high gloss gold highlights around keys. Solid feeling bulging Texas shape with green (flush) display filter.
	Display:	8 digit green VFD display
	Features:	Basic four function with percentages, square root, squares, inverse, three function memory and change sign
	Age:	1977
	Manufacturer:	Texas Instruments, assembled in the USA. Serial No. 230557
	Comments:	Nice feeling classic Texas calculator. The battery compartment directly exposes the main circuit board - which causes a problem if the batteries leak onto the board! Keys have a positive clicking sound.

Components:
Boards:
Construction:

Logic comments:	(CE) is used to clear the last number entered, (C) to clear the calculator and (CM) to clear the memory
	the (RV) key is used to exchange the display with the previous result or entry