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Known differences between SimH, 11/70, and w11a

SimH: MMU traps not suppressed when MMU register accessed

The 11/70 does not execute an MMU trap and doesn't set A or W bits in PDR when an MMU register is accessed, thus MMR0 to MMR3 and any of the PDR and PAR registers.

SimH doesn't support this behavior. xxdp program ekbee1 tests 061 and 063 verify this behavior and are skipped (see patch).

w11 also doesn't support this behavior, this is documented as w11 known difference.

Tested with SimH V3.12-3.