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HP 41-C
Manufactured by: Hewlett-Packard     Model: 41-C     Year: 1983

The HP 41C was Hewlett Packard's first alphanumeric calculator, having a 12-character 14-segment LCD display (most of the predecessors used red LEDs). It had non-volatile memory, and 4 expansion slots on the back, which supported such add-ons as a bar-code wand, clock/calendar/stopwatch, additional memory, and an I/O bus interface. It used RPN (Reverse Polish Notation) and was programmed in an HP proprietary calculator language.