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