[pups] thrust meter?
johnh at psych.usyd.edu.au
Tue Oct 10 09:02:08 AEST 2006
On 05/10/2006, at 10:15 PM, Dave Horsfall wrote:
> On Wed, 4 Oct 2006, Brian Knittel wrote:
>> 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
>> at UCSF. It was really delightful having this analog meter
>> bouncing up
>> and down as people worked away.
> 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).
Um, depends what you mean by thrust. It was originally designed for a
where bus activity would have been a fare indication of machine load
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
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?
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