Novus 4510 Mathematician

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Calculators: Handheld: Novus 4510 (aka Mathematician)

	Size (approx):	76mm x 150mm x 25-30mm (w,h,d) Weight 130g excluding batteries
	Power:	9V DC, 1 x PP3 size battery. It accepts an adapter/charger (undefined but 9V centre negative) located on the top side on the right. There is a power save function that switches the display off.
	Case:	Two-piece beige matt case with heavily inset red display filter which gives a clear image. The keyboard surround is a grey plastic panel that sits in a recess and is printed silver with the calculator name and key labels. A similar grey panel sits in its own upper recess with the manufacturers name. The whole calculator is slightly wedge shape so sits in the hand or desk equally well. They keys are squishy and long travel but work well enough. The on/off switch is on the left side level with the display. There is a recess panel on the battery cover that looks like it holds a purpose supplied label for your notes / name etc.
	Display:	8 digit red LED (small dot type) with bubble lens with a ninth digit for negative and error indications.
	Features:	Four functions plus percentages, square root, pi, change sign, register exchange, squares, reciprocal, powers, logs, trigs, degree/radian switching and five function memory. Reverse Polish Notation.
	Age:	1975
	Manufacturer:	Novus was a brand name of National Semiconductor but nothing is mentioned on the back panel. Serial No. 1171315. There is a further number embossed on the rear of the case N608 which might be a part number.
	Comments:	Quite a nicely proportioned calculator with nice display and good range of functions. The same rough design was used for a whole series of models but some were in different colour schemes. The display on mine has the lower segment not working which may be a sign or poor reliability. RPN is a pain and the odd extra memory function of (M+X²) is unique as far as I know.

Components:	1 x cpu: Nat Semi NS/550 MM5760N 24 pin DIL, 0.6" width 1 x display driver IC: Nat Semi NS//549 DS8864N 1 x LED with bubble lens display module in its own socket no other components
Boards:	The keyboard board is fixed to the front via ten plastic lugs and is joined to the cpu board by a 13-way ribbon cable. The cpu board is fixed to the back with three screws.
Construction:	Remove the two screws from the rear and carefully hinge off the rear from the top two lugs - not easy so if in doubt don't try it.

Logic comments:	(C) is supposedly used to clear to the previous number (but I cannot get it to work) and a second time to clear the whole calculator.
	There is no constant
	Input overflow is suppressed, inputting a ninth digit is ignored
	Negative numbers are shown with a "-" in the far left (ninth) digit thereby allowing full eight-digit negative numbers
	Divide by zero shows ".0.0.0.0.0.0.0.0." and is not recoverable
	Overflow shows no number with ".0.0.0.0.0.0.0.0." and is not recoverable
	Negative square roots show no result and ".0.0.0.0.0.0.0.0." and is not recoverable
	The change sign (CHS) can be used in mid-number entry
	Memory store is not indicated; you have to remember it. There is an odd function that allows you to store the square of x and add it to the current contents of the memory.
	The calculator is totally RPN. to do 9/3 you key in (9)(ENT)(3)(/), what a pain!
	There is a power save function; after about 30 seconds the display goes to a row of nine decimal points. Operation can continue by just pressing the next key you want.
	The (F) or function key is used to select the operation in the lower label
	The (X<>Y) key is used to exchange the calculator's registers
	There is a power save function - after about 30 seconds just once decimal point will stay alight, pressing any key will continue.
	The fare left (ninth) digit decimal point reminds you of radian mode.