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Victor 3900 Desktop Calculator
Victor 3900
The Victor 3900 was way ahead of its time from a technology standpoint, utilizing very early MOS (Metal-Oxide Semiconductor) Large-Scale Integrated Circuits to implement its logic. This was in 1965, at a time when all other calculators were using discrete transistors, or a few small scale bipolar integrated circuits. The Victor 3900 was the first electronic calculator offering from Victor Comptometer, a company that was noteworthy for its large line of dependable mechanical and electromechanical adding machines and calculators. Unfortunately, while the electronic design of the 3900 was sound, the technology to make the complex integrated circuits that made up the machine was a bit ahead of its time, and the machine ended up having a short market lifetime, with somewhere between 1000 to 2000 of the machines being produced. The 3900 provided 20 digit capacity, automatic floating decimal, CRT display that showed the content of two of three memory registers, along with the working registers of the machine. It provided the basic four math functions and automatic square root. The machine had accumulation functions to add or subtract products and/or quotients from either of two accumulator-style memory registers. A third memory register (not displayed) was a store/recall-only register.| Manufacturer: | Victor Comptometer |
| Model Number: | 3900 |
| Manufactured In: | USA |
| Date of Introduction: | October, 1965 |
| Price at Introduction: | $1,825 |
| Display Technology: | CRT, 5 lines |
| Logic Technology: | 29 MOS Large Scale IC devices made by General Micro-electronics |
| Digits of Capacity: | 20 |
| Decimal Modes: | Full Floating Decimal w/thumbwheel selectable roundoff position |
| Math Functions: | Four Function plus Square Root |
| Memories: | Two accumulator-style memory registers (I & II) |
| One non-displayed store/recall memory register | |
| Constant: | Addition, Subtraction, and Multiplication |
| Size: | 20" wide, 11" deep, 7 1/2" high |
| Weight: | 24 pounds |