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Нужно попробовать с MAPIO.
Хорошо, попробую.

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"Взял" PDP2011 от forth32, заменил в TSGEN QBUS на UNIBUS и поставил MEMSIZ = 2048.

Сработало (sh mem):
Total installed memory = 3840Kb
Size of unmapped TSX and handlers = 28Kb
Size of mapped TSX system regions = 53Kb
Total size of TSX and mapped data = 91Kb
Size of mapped device handlers = 0Kb
Size of sharable run-time systems = 0Kb
Size of data cache buffer area = 0Kb
Space available for user jobs = 1952Kb
Swappable job context area = 6Kb
Current job memory limit = 56Kb
Maximum job memory limit = 64Kb

RT11XM:
PDP 11/70 Processor
3840KB of memory
FP11 Hardware Floating Point Unit
Extended Instruction Set (EIS)
Memory Management Unit
Cache Memory
50 Hertz System Clock