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Definition of "Program Status Word Register" |
The program status word register (PSW) is an IBM System/360 architecture and successors control register which performs the function of a Status register and Program counter in other architectures, and more. Although certain fields within the PSW may be tested or set by using non-privileged instructions, testing or setting the remaining fields may only be accomplished by using privileged instructions. Contained within the PSW are certainly the zero (non-zero) and carry (borrow) flags and similar flags of other architectures' status registers, in this case encoded as a condition code with values from 0 to 15, representing the arithmetic sum of the four condition code bit values, 23 + 22 + 21 + 20. |
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