Unibus disk controller with modern storage
pete at petelancashire.com
Fri Oct 21 14:14:14 CDT 2016
To solve the loading problem a division of Tektronix built their own Unibus
We not only had a lot of stuff attached to the Unibus but was in multiple
We also went with round cables the Tektronix made internally. We also made
our own Unibus
cables and added a few LEDs to the paddle boards, power status was one of
remember what the others were far.
A picture of the first generation of the system
By the time I ended up at Tek the PDP11 had been renamed CP-1160 and came
colors of light and dark blue.
The Unibus had to make it from the PDP to a couple of the boxes near the
On Fri, Oct 21, 2016 at 11:50 AM, Guy Sotomayor Jr <ggs at shiresoft.com>
> > On Oct 21, 2016, at 11:41 AM, Paul Koning <paulkoning at comcast.net>
> >> On Oct 20, 2016, at 6:05 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
> >>> From: David Bridgham
> >>> the right threshold voltage to meet the receiver spec
> >> The UNIBUS spec says the 4 crucial receiver parameters are input
> >> (high and low), and the input currents (high and low); the crucial
> >> transmitter parameters are the output low voltage (at 50 mA sink), and
> >> the output high leakage current.
> > Where did you find those specs? I see a Unibus Spec on Bitsavers, but
> it doesn't appear to mention the electrical specs.
> They exist in various DEC handbooks. I don’t recall which one had them.
> The specs are fairly stringent in order to meet the max unibus bus lengths
> (my 11/40 is close to max).
> TTFN - Guy
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