30 Jul
2014
30 Jul
'14
10:44 a.m.
On 07/30/2014 09:45 AM, Peter Corlett wrote:
Reasonably interesting CPUs effectively have two
instruction sets: user
instructions in which applications are implemented, and system/supervisor
instructions for use by the operating system. The latter are more malleable
than the former, since the operating system is expected to be upgraded to take
the different functionality into account.
So the CDC 6600 isn't interesting? :)
Actually, if you look carefully, the "supervisor" instructions are
effectively another CPU--the PPUs.
--Chuck