15 Sep
2017
15 Sep
'17
3:03 p.m.
Also, in my Tektronix archives... we had an 11/60 with WSC and IIRC Steve
Glaser took a stab at moving the CMU stuff. The microengines between the
11/40 and 11/60 were different, so the code had to be rewritten. A big
issue, again IIRC, was the microcode compiler/tools for the WSC ran on RSX
so it meant UNIX was not running, which was not popular.
But around the same time, unexpected our group had the chance to get an
fairly loaded cast off seperate I/D based 11/70 which had been running
RSTS/Cobol for a business support team in sales. By the time, Steve got
anything working on the 11/60, I had the 11/70 (aka "teklabs") up and
installed; and I don't remember what happened to the WSC stuff; since we
had better solution to small address space problem of adding a '17th
address bit' with hardware.
Clem
Clem
On Fri, Sep 15, 2017 at 8:44 AM, Clem Cole <clemc(a)ccc.com> wrote:
CMU/CS implemented CSAV and CRET on the 11/40e (6th
edition++). IMO - it
was a mixed bag. I've forgotten the statistics, it was a few ticks fasters
for saving the registers, which was good. The primary thing it did was
save a small amount of address space on the non-I/D 40 - which was helpful
for applications as they got larger and were running out of address
space...... But it was PITA in practice because it meant that binaries
compiled on IUS and SUS (the UNIX two systems in CS), would not run
anywhere else on campus which were mostly 11/34 or later 11/34A's and it a
networked environment (which we were just starting to create) the seams
tended to show a little more than we would have liked.
IIRC I eventually got a emulator working at Mellon Institute and EE
systems so they binaries would not core dump, but we just recompiled we ran
into them.
The real solution to address space issue was when DEC released the 11/44
which was separate I/D (11/70 class) and the thunk work that we did in
2.9BSD in trying to move 4.1/4.2 code to the 11.
FYI: Danny Klein and I should have the compiler somewhere (and the
microcode) is I ever get my CMU archives off tape. It's on my list of
things to look for.
Clem
On Thu, Sep 14, 2017 at 11:59 PM, Dave Horsfall <dave(a)horsfall.org> wrote:
On Thu, 14 Sep 2017, Noel Chiappa wrote:
Interesting factoid: The PDP-11 initially used a threaded FORTRAN
implementation. In line with the observation
above (about a new virtual
machine), DEC actually looked into writing microcode for the -11/60 (which
had a writeable control store) to implement the FORTRAN virtual machine.
Did anyone actually use the WCS? I had visions of implementing CSAV and
CRET on our -60, but never did get around to it. Too late now...
--
Dave Horsfall DTM (VK2KFU) "Those who don't understand security will
suffer."