5 Oct
2006
5 Oct
'06
4:17 a.m.
The thrust meter project -- was that an analog meter that displayed %
CPU utilization? I remember that Tom Ferrin had one mounted in the
middle of a DEC panel filler on the 11/70 at the Computer Graphics
Lab at UCSF. It was really delightful having this analog meter
bouncing up and down as people worked away.
Brian
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5 Oct
5 Oct
12:15 p.m.
On Wed, 4 Oct 2006, Brian Knittel wrote:
I believe so...
(Dave leans over to dig out article.)
OK, page 27 of AUUG Vol 2 No 5 (Jun/Jul 1980).
It integrated the BUS BUSY signal over a suitable time constant (and my
electronics knowledge is a bit too rusty to figure out Tc, but with a
10uF tantalum capacitor I imagine it would be a few seconds).
The credits are:
Designed originally by Pete Madams (Essex), modified by J Feenstra
(Nijmegen), and this drawing executed by Paul Griffith (Essex).
-- Dave
9 Oct
9 Oct
11:02 p.m.
On 05/10/2006, at 10:15 PM, Dave Horsfall wrote:
Um, depends what you mean by thrust. It was originally designed for a
11/45
where bus activity would have been a fare indication of machine load
since
all memory and i/o used the unibus (I'm excluding the effects of fastbus
memory on 11/50 and 55's).
The 11/70 unibus was actually slower than the 11/45, and generally
didn't
have memory or disk/tape i/o on it (separate memory bus and massbus). So
'thrust' was probably mainly character i/o (dh and dz's) and older
disk/tapes (RK05's etc)
Now, where's 11/70 maintenance printset?
Cheers
John
10 Oct
10 Oct
9:05 a.m.
John Holden wrote:
I got them here. :-)
Hmm, but yeah. Since the bus might be idle even though the CPU is
running, you might not get a very good reading by looking at the unibus.
But I think there are other signals that would be better to integrate
over. Such as the MASTER lamp (or is it the CPU lamp perhaps?) of the
front panel.
Johnny
10:20 p.m.
On 10/10/2006, at 9:00 PM, Dave Horsfall wrote:
The MASTER lamp signifies that the CPU has the unibus, hence a
similar problem
to using BUS BUSY. You could use KERNEL/SUPERVISOR/USER signals as an
indication
of context switches. My favourite is a light chaser using the data
display from
the idle loop. Only works on an 11/45/50/55/60/70 (a bit boring on a
11/60 as
it had a 7 segment display).
Got one in my office. The lightpen latches the current x/y
coordinates from
the d/a converters. Aim it at something that will trigger it and you
get random
hits all over the screen
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6 comments
4 participants
participants (4)
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Brian Knittel -
Dave Horsfall -
John Holden -
Johnny Billquist