| 21. | The museum maintains an index register of all valuables that are kept in the facilities of the University.
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| 22. | Instructions that modified or stored index registers used a four-bit field ( xo ) to select that index register.
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| 23. | The machine's most significant innovation is generally considered to be its incorporation of index registers, commonplace on modern computers.
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| 24. | Instructions that modified or stored index registers used a four-bit field ( xo ) to select that index register.
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| 25. | The third index register was dedicated to pointing at the current procedure's stack frame on the call / return stack.
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| 26. | Another four-bit field in the instruction allowed for any AC other than AC0 to be used as an index register.
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| 27. | The Western Design Center also designed and produced the accumulator and index registers, as well as other 65C816 enhanced features.
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| 28. | There were conditional jump operations based on the values in the index registers specified in the " tag " field.
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| 29. | Op codes were 6 bits, registers 3 bits, index register ( modifier ) 2 bits and data address 13 bits.
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| 30. | Initially registers were limited to an University of Illinois, designed an index register as an extension to the original EDSAC hardware.
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