30 Nov
2021
30 Nov
'21
9:19 p.m.
Indeed, the early PDPs (10/15/20) had no microprogramming at all. Even
the early microprogrammed ones used "random logic" to implement that.
It would take ten years before large scale integration took over. The
PDP-11/44 in 1979 was the last of the discrete logic CPUs.
------ Original Message ------
From: pbirkel(a)gmail.com
To: "'TUHS main list'" <tuhs(a)minnie.tuhs.org>
Cc: "'Eugene Miya'" <eugene(a)soe.ucsc.edu>
Sent: 11/30/2021 3:07:15 AM
Subject: [TUHS] Encoding an ISA: Random Logic vs. Control Stores
I believe that the PDP-11 ISA was defined at a time
when DEC was still using
random logic rather than a control stor