| 11. | However, the I / O devices needed more electronic logic to manage their own word count and transfer address registers.
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| 12. | There are ten 60-bit read registers and ten 60-bit write registers, each with an address register.
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| 13. | A lock flag and locked physical address register are used by the load-locked and store-conditional instructions for multiprocessor support.
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| 14. | This call-return stack may be entirely managed by the hardware via specialized address registers and special address modes in the instructions.
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| 15. | When this is the case, an address in a debug address register may be relevant to one task but not to another.
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| 16. | Memory protection and relocation was accomplished using a base and bounds register, the " Base Address Register ( BAR ) ".
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| 17. | It had 32-bit address registers and 32-bit data registers, but had only a 16-bit wide data bus.
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| 18. | Reportedly, it allowed the CPU designers to achieve a higher degree of parallelism, by using an auxiliary execution unit for the address registers.
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| 19. | A sequence of operations on adjacent fields could be " chained ", using the addresses left in the address registers by the previous operation.
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| 20. | Some machines have a stack of unlimited size, implemented as an array in RAM accessed by a'top of stack'address register.
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