Concept 2000: Mr Musical, mus-i-cal

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Calculators: Handheld: Concept 2000 Mr. Mus-i-cal (aka 560)


		Size (actual):	84.5mm x 178mm x 40mm (max) (w x h x d) Weight 190g excluding batteries but including carry strap.
		Power:	9V DC using 1 x PP3 size battery. It does not accept an adaptor. A label on the battery compartment door states "Use fresh alkaline battery only".
		Case:	Two piece silver matt plastic case in the shape of a robot. The raised areas of the face and arms are painted black and hence subject to wear. Below the face is a silver sticker printed with blue, red and black markings which sits in its own recess. A convex red plastic display filter sits proud of the case. The recessed keyboard surround has black printed text and the lower logo is red printed text. A white carry strap attaches to the top of the head. The keys are soft-touch with no feedback click.
		Display:	8+1 digit red LED with bubble lens
		Features:	Standard four functions with "maths question and answer" and "music" modes
		Age:	1979
		Manufacturer:	Concept 2000, model number 560, made in Hong Kong.
		Comments:	Cute calculator which is plainly aimed at the toy market.

Components:	1 x cpu: Texas Instruments TMS1000NLL MP3206 DCS 7936 (date code week 36 of 1979), 28 pin DIL, 0.6" width black plastic 1 x IC: Texas Instruments SN75498N 7936X , 20 pin DIL, 0.3" width black plastic 1 x 9 digit LED display unit with integrated bubble lens (Texas Instruments UNIV 9 DIGIT 233 G, DIS1017 7936 Korea) 1 x transistor 0 x diodes 2 x capacitors 17 x resistors 1 x Speaker: low profile, moving coil, permanent magnet
Boards:	The main board (560M) sits on top of the keyboard assembly supported by plastic pillars and a screw. It is attached to the keyboard assembly by 9 thin wires. A 15-way ribbon cable joins them together. The keyboard is attached to the front of the case with four screws. The display sits loose and is connected via 17 wires.
Construction:	Remove the single screw from the back and gently prize off the back, which separates easily.

Logic comments:	The (CE) key is used to cancel an entry and the (C) key clears the whole calculator
	This can be used as a standard four function calculator, a maths testing machine and a music instrument with 10 different notes (using the 0 to 9 keys).