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When the system is first started after all the devices on the Unibus have been reinitialised, the memory management unit is disabled and the processor is in kernel mode.
Under these circumstances, virtual (byte) addresses in the range 0 to 56K are mapped into identically valued physical addresses. However the highest page of the virtual address space is mapped into the highest page of the physical address space, i.e. on the PDP11/40 or 11/45, addresses in the range
are mapped into the range
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