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and 3 could be used.

The 1971 CDC STAR-100 has a register file of 256 64-bit registers, 9 of which are reserved. Unlike most computers, the STAR-100 instructions only have register fields and operand fields, so the registers serve more as pointer registers than as traditional index registers.

While the 1972 Intel 8008 allowed indirect addressing via register pairs, the first microprocessor with a true index register

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