Chinon Executron 8M

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Calculators: Handheld: Chinon Executron 8M

	Size (approx):	115mm x 210mm x 50mm(max) (w,h,d)
	Power:	240V AC, 50/60Hz 6V 200mA adapter, 4xC size batteries which can be charged in the calculator if Nickel-Cadmium
	Case:	Originally beige and brown plastic with brushed aluminium top bar
	Display:	8 digit green fluorescent display
	Features:	Automatic floating, constant switch, square root, percentages and memory
	Age:	1974
	Manufacturer:	Chinon. Made in Japan, Serial No. 088084 also 830157
	Comments	found this machine with original adaptor. Buttons are solid and positively click. Bonus that this is a Ni-Cd battery charger as well.

Components:	1 x cpu:r NEC µPD277C (K46446) 28 pin DIL 1 x NEC glass encapsulated display LD80 26 x resistors 9 x capacitors 8 x diodes 2 x transistors
Boards:	One main component board, quite sparsely populated and most of the components devoted to the on-board charger. Two additional boards for main button bank and upper button bank are mounted on the front. Main board number FNKC01 234G 76598 along with 240501 and the "SD" logo. There appears to be a date stamp on the main board 3074, which is assumed to mean week 30 of 1974.
Construction:	Opened via four screws, two of which are in the battery compartment. Tie wires between front and back boards are too short to fully open the sides. Button mechanism is just two copper wires pushed together.