Details:

The Victor 1900 calculator is a full floating point machine with one semiconductor memory register and a constant mechanism which can be used in al calculation functions.  It uses a plasma display in a sandwich construction, some IC’s and furthermore some hybrid and some discrete components to drive the display.

The keyboard uses conductive rubber sheets on a PCB. The keys press the rubber sheets against the PCB’s  circuits. Although it’s probably not as sustainable as reed relays which were often used those days, it still feels like a high quality construction and works flawlessly after so many years.

Usage:

Addition/subtraction:

Use the “+” and “-” key to add/subtract in the display.   The “M+” and “M-” key operate in memory.

Multiplication:

Works in algebraic mode using the “X” and “=” key.   Allows addition/subtraction in memory by using the “=+” and “=-” keys.

Division:           

Works similar to multiplication.

Function of some keys, switches etc.:

• The on-off switch is located at the back. At power-on the display shows a single “0” in the outer right.
• “Set” + a digit (0 to 9) sets the decimal point. Still the decimal point shift to the left if necessary to prevent overflow.
• “C” clears the input register, “Call” clears all except memory, “MRC”  clears memory.
• “MR” puts the memory contents in the display.
• Constant: A number entered stays in the input register until a new number is entered.  I.e. 12x12x12  can be calculated by entering 12, followed by “X”, “=”, “=”.
• “%” supports percentage calculations:  enter 1st number, push the “X” key, enter 2nd number, push the “%” key, then the “=” key.

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Serial number:

Built in:

Functions:

Market-introduction:

Production until:

Price:

4748-654

1973

Addition, Subtraction, Multiplication,  Division

1973 ?  (My machine contains a PCB and some IC’s with prints indicating 1973 as year of production)

1974 ?

Approx. DM. 1050,- in 1974  (Source: Büromaschinen Lexikon)