New answers tagged pdp-11
4
I asked Bob Supnik (J-11 CPU project lead, SIMH creator) about this, and this is his response.
The answer is no. If the MMU is not operating, the MT/FPI/D
instructions operate on physical addresses and are limited to 16bit
addresses.
The PSW mode bits (in particular, previous mode) are operative for
choosing which stack pointer is used if the ...
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