IBM Novell 10 SP1 EAL4 - Manual (Page 120)

5.5.2.4.7.1 Dynamic address translation
Bit 5 of the current PSW indicates whether a virtual address is to be translated using paging tables. If it is,
bits 16 and 17 control which address space translation mode (primary, secondary, access-register, or home) is
used for the translation.
The following diagram illustrates the logic used to determine the translation mode. If the DAT mode bit is
not set, then the address is treated as a real address (Virtual = Real).
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Figure 5-49: System z address types and their translation
Figure 5-50: Program Status Word