22 Aug
2016
22 Aug
'16
5:16 a.m.
From: Ethan Dicks
Second, many/most of the CPU modules are -YA variants,
and the "PDP-11
Field Guide" mentions that they would be part of a KH11-A. About the
only description I can find for what that is, is a single mention ..
of the "large-system capability option" related to the DT03-F Unibus
switch requirements. Anyone know what this is?
I've been told that it's a revision to the CPU timings to reduce NPR latency,
although I have no details; I had previously looked online, and was not able
to locate anything about it.
a full set of boards for a KE11-A. I have been
sniffing around for a
KE11-B (single-board version), and now, I don't need to (as long as
this one works or can be repaired).
Doesn't it need a custom backplane too? Do you have that?
my goal all along has been to fire up enough hardware
for Warren
Toomey's reconstruction of ~1972 UNIX
Maybe someone here can scratch a mental itch for me; I recall reading
_somewhere_ about some early PDP-11 memory management thing used on early
PDP-11 Unix that supported the KE11 (which is a memory-mapped device) by
having a small window that allowed user code access to the KE11. IIRC, it was
a DEC thing, not something home-rolled at Bell. Does this ring any bells for
anyone?
Noel