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wfjm.w11/doc/w11a_diff_70_unibus_mapping.md

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Known differences between w11a and KB11-C (11/70)

18-bit UNIBUS address space not mapped into 22-bit address space

The 11/70 maps the 18 bit UNIBUS address space into the upper part of the 22-bit extended mode address space. With UNIBUS mapping enabled, this allows to access via 17000000:17757777 the memory exactly as a UNIBUS device would see it.

The w11a doesn't implement this remapping, an access in the range 17000000:17757777 causes an NXM fault.

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