Specifications for Monroe 990

Manufacturer:		Monroe International Division, Litton Business Systems
Model Number:		990
Serial Number:		S110675
Date of Manufacture:	Mid-1970
Manufactured In:	Japan (Canon)
Original Price:		$1250
Weight:			17 Pounds
Size:			12" Wide, 15" Deep, 6" High
Power Requirement:	17 Watts, 115VAC
Display Technology:	Nixie Tube, 16 NEC CD-71 tubes, RH Decimal Point
			Discrete Neon "Comma" and Status Indicators
Logic Technology:	170 Small Scale Integrated Circuits
			DTL TI SN39xx and SN45xx-series
			Eight Plug-in Circuit Boards
			Magnetostrictive Delay Line Register Storage (made by NEC)
Digits of Capacity:	16, No zero-suppression
Decimal Modes:		Fixed, Selectable at 0, 2, 4, 6, 8 or 10 digits
Arithmetic Logic:	Arithmetic
Math Functions:		Four Function, Square Root
Constant:		Yes, Multiply and Divide
Memories:		2, with in-use indicators
			Memory Register 1 accumulator for all operations
			Memory Register 2 operates as counter, accumulator, or
			 sum-of-products register, with M+/M- keys.
Other Features:		Truncate/Force Up/Round Switch Selectable

Previous Machine: Denon DEC-311 Next Machine: Sharp QT-8D Related Machines: Monroe 950 Canon 141 Canon 164P Monroe 920 Monroe 620 Canon L163 Advertising: "The 990-TWO" "990 ELECTRONIC CALCULATOR"
Back to Exhibit Back to Calculator List

Copyright ©1997-2023, Rick Bensene.

All content on this site is not to be gathered, scraped, replicated, or accesed in any way for any use in populating machine learning or intelligence (Artificial Intelligence, a.k.a. AI) databases, language models, graphs, or other AI-related data structures. Such use is a violation of copyright law. Any such access will be reported to the Oregon Attorney General and prosecuted to the fullest extent the law allows.