[geeks] Sun-1 with Two CPUs?

[Phil Stracchino]

On 02/24/11 19:43, Nate wrote:
> "The Sun-2b2s faulting workaround was not in hardware. The OS checked to see
> if the faulting instruction was an XOR, if so and if the target address was
> close to the top of the stack the stack would be expanded. If it was any thing
> else you got a SEGV. The Sun-2 didnbt do paging, it did whole process swaps.
> I heard the Apollobs of the era used 2 68000b2s that ran at a single clock
> cycle offset and the 'leader' handled the page fault, and then let the
> 'trailer' finish the access, and did some sync up dance and maybe swapped
> positions. Very costly. The Apollo did have a pager." [0]

Amazing, some of the hardware hacks people have used over the years.
80286 protected mode was another real kludge.

-- 
  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
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