Omron 60

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Calculators: Handheld: Omron 60

	Size (approx):	100mm x 157mm x 27-40mm (w x h x d) Weight 286g not including batteries.
	Power:	6.0V DC using 4 x AA size batteries It accepts an adapter (type AP60D, 6V DC 1.2W) through a socket on the top side to the far left. The battery pack is completely removable from the top by pressing two side buttons – the adapter plugs into this and there is a ribbon to aid removal on either side of the pack.
	Case:	The two-piece case is in glossy white plastic with a large glossy black plastic keyboard surround. The upper area is dominated by an oversized plastic display filter that is painted black with a small neutral window for the display digits. This is printed with white text for the brand, model number and digit positions. It sits flat and flush and gives a reasonable bright image. The keyboard is heavily sloped with silver text for the on/off label. The keys are long travel, very bouncy and hollow sounding. The battery pack has a silver printed black plastic piece on the top edge. As well as the usual silver sticker on the reverse there is embossed instructions. Unfortunately gone on my sample; there was a small plastic loop on the top left hand side for the attachment of a carry strap.
	Display:	6 digit blue VFD with no seventh digit. The display is left leading rather than the more modern right reading.
	Features:	Standard four functions, semi-RPN logic
	Age:	1973
	Manufacturer:	Omron Tateisi Electronics Co., made in Japan. Serial number 434641.
	Comments:	Well built more for the desktop than as a hand held but carry strap made me categorize it as the latter. Early RPN and small amount of digits are rather archaic by today’s standards. The chunky hollow sounding keys are great! The logic also shows its age with 12 digit precision by has negative zero and divide by zero bugs. The original case is soft black plastic with top popper closing. There appears to be a gap on the left hand side for a carry strap to poke through. Very similar to the Citizen Six.

Components:	1 x cpu: Omron (Hitachi) HD32163P 3H 4 (date code 4th week of August 1973), 28 pin DIL, 0.6" width 2 x IC: NEC µPD110C K08246, 14 pin DIL, 0.3" width ! x 6 digit VFD: single tube round faced double ended; Futaba 6-CT-02 5 x transistors 7 x diodes 9 x capacitors 36 x resistors 1 x transformer: CT-60-C1 TDK Japan
Boards:	The main cpu board (60-34472B DEC) sits loose on the keyboard assembly (KBCSM-44001A KB PWB009) and is joined by an 11-way connector. The keyboard assembly is fixed to the front with fours crews. A small power connector board sits at right angles to the main board and is connected with a few logs and slots.
Construction:	Remove the battery unit. Carefully squeeze in the sides of the rear section to pop the lugs running down the sides. If in doubt do not do it as you may damage your calculator. The rear section then lifts off.

Logic comments:	The (C) key is used to clear the whole calculator as there is no cancel entry function
	Input overflow is not suppressed inputting a seventh digit causes the decimal point to disappear and the calculator to hook up – which is not recoverable.
	Negative numbers are shown with a "-" in the far right (sixth) digit. Seven digit negative numbers are allowed – you just cannot see the negative sign!
	There is no constant on any function
	Divide by zero shows no display at all and is not recoverable!
	Overflow shows the answer and hooks up and is recoverable. Interestingly by pressing (C) you will then see the six most significant digits so internally it works to 12 digits precision. You can carry on calculations with these digits.
	It operates reverse polish notation. To perform 9-5 you key in (9)(+=)(5)(-=) the display will show “4”. Multiply and divide are directly entered.
	This calculator suffers the negative zero bug; key in (1)(+=)(2)(-=) to give “-1” now key in (1)(+=) to give “-0”

	The scan left shows the main cpu board with a large number of components - to be expected this early in the 1970s. Notice that no expense was spared in construction as you can see at the bottom the small blue block connector that fixed to the keyboard assembly. Very easily detached for repairs.		This piece of paper was inserted into the rear section - I imagine it is a QA sticker. Can anyone translate it for me? It is approx 55mm wide and over 80mm long with two copies of the text on the full length.