After a SET CPU command is issued (for analyzing a crash dump
    only), the symbols defined in the following table are set for
    that CPU.

    CPUDB      Address of CPU database
    IPL        Interrupt priority level register
    MCES       Machine check error summary register
    PCBB       Process context block base register
    PRBR       Processor base register (CPU database address)
    RAD        Address of RAD database
    SCBB       System control block base register
    SISR       Software interrupt status register
    VPTB       Virtual Page Table Base register