MIT provides MULTICS source and documentation - test-drb@ccmp.vtda.org

12 Nov 2007

From: Chris Kennedy <chris at mainecoon.com>
...

 Brian L. Stuart wrote:

  From
multicians.org:  Although there were 64 rings (an illusion created by software) on
 GE 645 Multics, there are 8 rings, supported in hardware, on the
 Honeywell 6180 in its various models.  
 As opposed to what? Four on the X86?

 The original question remains, how many rings does Multics need?  Just
 because eight were provided by hardware doesn't mean they were all used. 
For the most part, they used 0-4.  I don't think you'd
actually need 5-7.

BLS