Re:The Burroughs B5000 - 20 Years Later and Still Ahead of t...
by acqq on Tuesday May 22, 2012 @07:44PM
(#4010702)
One interesting example from the text:
"For additional security, code and data were distinguished in memory by the use of a "flag bit", and the hardware would not execute data or alter code without first having explicitly changed the flag (something reserved for privileged processes)."
"For additional security, code and data were distinguished in memory by the use of a "flag bit", and the hardware would not execute data or alter code without first having explicitly changed the flag (something reserved for privileged processes)."
Sounds awfully like a
http://en.wikipedia.org/wiki/NX_bit
which Intel introduced first time in 2004 their mainstream CPU's as they took the AMD64 specification:
http://en.wikipedia.org/wiki/AMD64
Therefore on the common processors we have that feature only 8 years, now when B5000 is around 50 years old.