Unibus disk controller with modern storage
Guy Sotomayor Jr
ggs at shiresoft.com
Fri Oct 21 13:50:39 CDT 2016
> On Oct 21, 2016, at 11:41 AM, Paul Koning <paulkoning at comcast.net> wrote:
>> On Oct 20, 2016, at 6:05 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
>>> From: David Bridgham
>>> the right threshold voltage to meet the receiver spec
>> The UNIBUS spec says the 4 crucial receiver parameters are input thresholds
>> (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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