[TUHS] Memory on Lion's v6

Bakul Shah bakul at iitbombay.org
Tue Mar 1 11:25:09 AEST 2022

On Feb 27, 2022, at 9:48 PM, Will Senn <will.senn at gmail.com> wrote:
> It seems like he must have had an MMU and 128k memory,

This is covered in the Lions book. For instance

  On the PDP11/40 the memory management unit consists of two
  sets of registers for mapping virtual addresses to physical
  addresses. These are known as “active page registers” or
  “segmentation registers”. One set is used when the
  processor is in user mode and the other set, in kernel
  mode. Changing the contents of these registers changes the
  details of these mappings. The ability to make these
  changes is a privilege that the operating system keeps
  firmly to itself.

Also see section 7 and in particular 7.9. And may be more!

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