A register found in some CPUs, whose contents can be added to the address operand to give the effective address. Incrementing the index register then allows the program to access the next location in memory and so on, making it very useful for working with arrays or blocks of memory.
Index registers first appeared around April 1949 in the Manchester Mark I. The Mark I’s index register’s contents were simply added to the entire instruction, thus potentially changing the opcode (see The story of Mel)!
[in-dee-uh] /ˈɪn di ə/ noun 1. Hindi Bharat. a republic in S Asia: a union comprising 25 states and 7 union territories; formerly a British colony; gained independence Aug. 15, 1947; became a republic within the Commonwealth of Nations Jan. 26, 1950. 1,246,880 sq. mi. (3,229,419 sq. km). Capital: New Delhi. 2. a subcontinent in […]
noun 1. a sturdy, heavyweight fabric constructed in a figured weave, used especially in upholstery.
noun, (sometimes lowercase) 1. a black pigment consisting of lampblack mixed with glue or size. 2. a liquid ink from this.
/ˈɪndɪəmən/ noun (pl) -men 1. (formerly) a large merchant ship engaged in trade with India