15 Jul
2018
15 Jul
'18
8:28 a.m.
On 7/10/18 2:38 PM, Noel Chiappa via cctalk wrote:
There is mention in the J-11 specification documents stating 11/70 and
11/44 features were the target. ???? The force miss CCR bits are present
in both, to allow for segregation of the cache(s).? Thus the
compatibility may span both.??? Interesting to note that if there were
feature conflicts, these where solved in favor of the 11/44 except for
special cases.
You can find copies in
http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp11/j11
Jerry
From: Jerry
Weiss
See http://simh.trailing-edge.com/semi/j11.html
for information on the
design of the J11.
Thanks for that pointer; I don't think I've ever seen that - quite
interesting.
Alas, it didn't have the cache info - but now that I've though about it
overnight, I'm pretty sure the reason for the two bits that do the same thing
is for -11/70 compatability.