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DATAMATH CALCULATOR MUSEUM

NSC Novus Electronics NS220

Date of introduction:	1981	Display technology:	LCD
New price:		Display size:	8
Size:	3.9" x 2.4" x 0.25" 100 x 60 x 6 mm³
Weight:	1.6 ounces, 44 grams	Serial No:	6917523
Batteries:	2*LR54	Date of manufacture:	mth 11 year 1981
AC-Adapter:		Origin of manufacture:	Taiwan
Precision:	8	Integrated circuits:	Sharp LI3033MT
Memories:	1
Program steps:		Courtesy of:	Joerg Woerner

Does this NSC Novus Electronics Model NS 220 calculator look familiar to you?

Dismantling the featured NS220 manufactured in November 1981 by an unknown OEM (Original Equipment Manufacturer) in Taiwan reveals a clean design centered around a Sharp LI3033MT single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by two small LR54 (LR1130) batteries.

Inspecting the PCB of this NSC Novus Electronics NS220 calculator brought our attention to a small mark reading MK65-7, we spotted this PCB-Mark already with near identical offspring like the IMA LC 688, TI-1755, TI-1756 and Unisonic LC-7311BK and suspect to locate it in the Technico MK 65, too. Plus the Asaflex MK 653, Benkson CAL-20, Levi MK 1652, MBO MK65, M-Office MK650, Olympia MK 65, Privileg Senator, Radio Shack EC-376, Satek MK 652 and Unisonic LC-7311M. Based on the PCB-Marks located with the TI-2130 and its twin Technico F-800 we are almost positive that the NS 220 and its siblings were manufactured by Inventa Electronics Corporation of Taipei, Taiwan. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

If you have additions to the above article please email: joerg@datamath.org.