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Brother ProCal 514 Desktop Calculator

Image Courtesy Charles C. Littell, III

14-digit Nixie display calculator. Four function with accumulating memory register. Fixed decimal point set by thumbwheel switch. User-selectable rounding mode. Sum of Products/Quotients accumulating mode. Small-scale integrated circuit logic with magnetostrictive delay line for register storage. Unusual [00] key that enters two zeroes with one keypress. Wanted dead or alive.

See the exhibit on the Brother Calther 412 for an earlier example of Brother's second-generation electronic calculator.

Specifications for Brother Procal 514

Manufacturer: Brother Industries, Ltd.
Model Number: JC2-514 (Procal 514 Duplex)
Date of Manufacture: 1969
Manufactured In: Japan
Original Price: $895
Weight: 10.8 Pounds
Size: 10 7/16" Wide, 14 3/4" Deep, 5 1/5" High
Power Requirement: 20 Watts, 115VAC
Display Technology: Nixie Tube, 14 1/2" Tall Digits w/Right-Hand Decimal
No leading zero suppression
Logic Technology: Mitsubishi M53xx and 54xx-series Small Scale Integrated Circuits, DTL/TTL
Magnetostrictive Delay Line for Register Storage
4 Plug-in Circuit Boards, 115 IC's, 53 Transistors, 179 Diodes
250KHz Master Clock
Digits of Capacity: 14
Decimal Modes: Fixed at 0, 2, 4, 6 or 8 Digits Behind Decimal
Arithmetic Logic: Arithmetic
Math Functions: Add, Subtract, Multiply & Divide
Constant: Multiplication and Division using push-on/push-off [K] key
Memories: 1 Accumulator
Features: Accumulate mode for sum-of-products calculations
Backspace key for digit at a time correction
Performance: Addition/Subtraction: 14ms
Multiplication: 110ms
Division: 220ms