Panasonic JE-8004U

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Calculators: Handheld: Panasonic JE-8004U (aka 8004)

		Size (approx):	70mm x 118mm x 21mm (w,h,d) Weight 92g excluding batteries
		Power:	3.0V DC, 2 x AA size batteries, 0.4W. It accepts an adapter (JL-046, 047 or 048) through a socket on the top side to the far left.
		Case:	Compact two-piece grey smooth plastic case with grip ridges on the sides. Large front brushed aluminium panel is slightly raised. A further raised section is printed black with the words Auto Memory. This and the make/model number have survived very well. The display has a flat, neutral filter and small grey escutcheon. Subtle coloured keys are soft and squishy and have Casio-like surrounds. The on/off switch is on the left side, in line with the display. The back has a recessed panel labelled “name” for you to put your own sticker in.
		Display:	8 digit blue VFD, with a ninth digit for minus, memory and error indication.
		Features:	4 function calculator with percentages, square roots and one function memory
		Age:	1977/8
		Manufacturer:	Matsushita Communication Industrial Co., Ltd, Yokohama, Japan. Made in Japan. Serial number on the inside of the battery cover is 83403196
		Comments:	Very high quality feel to this compact and pretty calculator. Subtle grey, metal and blue colouring works very well. Original soft black plastic cover is open topped and embossed with Panasonic Electronic Calculator. The logic is OK with good recovery but let down by negative square roots and a very basic memory function.

Components:	1 x cpu: Texas TMS 1042NL KDS 7801, 28 pin DIL, 0.6" width 1 x 9 digit VFD single tube flat face: Futaba 9ST-20A 7K 3 x transistor 6 x diodes 6 x capacitors 4 x resistors 1 x transformer: ST 1600 Sumida
Boards:	The keyboard board is fixed to the front by a dozen plastic rivets. It connects to the main cpu board (ref YLPRDO 008300 7315), which sits loosely on top, via a 15-way ribbon cable
Construction:	Remove the single screw from the back and gently lift off the rear section.

Logic comments:	The (CE) button is used to clear last entry of a number and the (C) clear the whole calculator.
	Overflow on number input is suppressed inputting a ninth digit is ignored
	An overflow shows the result with a “C” (or “E” if negative) in the far left (ninth) digit and is recoverable using CE
	Divide by zero results in zero and a "C” in the far left (ninth) digit and is recoverable using (CE)
	There is automatic constant on all four functions
	Negative square roots are allowed and give a negative result
	Negative numbers are shown by a "-" in the far left (ninth) digit thereby allowing full eight digit negative numbers.
	Memory store is indicated by an upper “n” in the far left (ninth) digit
	The action of the memory is automatic; the result of an equals key is automatically added to the memory. A press of the (M) key will recall the memory and clear it.