High Quality Content by WIKIPEDIA articles! The Capricorn family of microprocessors was developed by Hewlett-Packard in the late 1970s for the HP series 80 scientific microcomputers. Capricorn was first used in the HP-85 desktop BASIC computer, introduced in January of 1980.The he Capricorn is a microprogrammed CPU containing 64 eight-bit registers, an eight-bit arithmetic logic unit (ALU), a shifter and control logic. One register pair is defined as the program counter, another pair as the stack pointer, and one more pair as an index pointer for internal operations. There is no dedicated accumulator — any general register can be used for ALU results because the register file is designed to allow two read and one write operations at the same time. Any pair of registers can be used as a 16-bit index register.

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