| 11. | Indirect addressing was almost as good as index registers.
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| 12. | In addition, index registers consist of a lower offset portion and an upper increment portion.
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| 13. | The processor may scale the index register to allow for the size of each array element.
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| 14. | It is also more efficient to set the index registers to 16 bits before pushing them.
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| 15. | Some instructions also subtracted the " decrement " field from the contents of the index registers.
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| 16. | The successor of the 701 was the index register-equipped IBM 704, introduced 4 years after the 701.
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| 17. | For example, the aforementioned 6502's index registers'size is 8 bits and the page size is 256 bytes.
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| 18. | Standard instructions had a 6-bit operation code, a two-bit index register identifier, and an 8-bit PC-relative address.
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| 19. | Index registers are used by instructions to modify the offset of the specified or assumed base register.
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| 20. | Perhaps the Manchester Mark 1's most significant innovation was its incorporation of index registers, commonplace on modern computers.
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