Specifications for Monroe 1665

Manufacturer: Monroe Division of Litton Business Systems
Model Number: 1665
Serial Number: E825291
Date of Manufacture: Early 1971
Manufactured In: USA
Original Price: $3,950
Weight: 22 1/2 Pounds
Size: 16" Wide, 14" Deep, 6 1/2" High
Power Requirement: 60 Watts, 110V AC, 60Hz
Display Technology: Drum Impact Printer, 21 columns
2-color, 2-1/2 lines per second.
Logic Technology: First-Generation "HTL" LSI Chipset
Chipset Designed by Computer Design Corp.
Chipset Fabrication by AMI
Logic contained on seven plug-in circuit boards
MOS Dynamic RAM for program/register storage
MOS Mask-Programmed ROM for microcode
Digits of Capacity: Internal: 14 Digits Mantissa + 2 Digits Exponent
Printed: 10 Digits Mantissa + 2 Digits Exponent
Decimal Modes: Fixed, Thumbwheel Selectable, 0-10 digits before decimal
Arithmetic Logic: Arithmetic
Math Functions: Comprehensive assortment of engineering math functions
Constant: Automatic for multiply/divide
Memories: 10 accumulator registers
Registers 7, 8, and 9 are working registers
Programmable: Yes, Learn Mode (LEMP)
128 Step Base Capacity
Additional 128 steps with optional CLEMP card
CLEMP card allows program loading via CR-1 Punched Card reader
Six Level Subroutine Nesting
Extensive Test & Branch Capabilities
Punched Card programming allows access to low-level microcode instructions/subroutines

Sincere thanks to Janet Harrison & Family for donation
of the Monroe 1665 to the Old Calculator Web Museum

Tech Data [HTL Processor Instruction Set]

Previous Machine: Victor 14-321
Next Machine: SCM Marchant I

Related Machines: Monroe 1655
Compucorp 120
Compucorp 122E
Compucorp 140
Monroe 1860

Advertising: Monroe 1665 Sales Brochure Cover [56K]
Monroe 1665 Sales Brochure Specifications Sheet [64K]

Documentation: Cover of Monroe 1665 Operator's Guide [35K]

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