> On Oct 21, 2016, at 2:50 PM, Guy Sotomayor Jr <g...@shiresoft.com> wrote:
>
>
>> On Oct 21, 2016, at 11:41 AM, Paul Koning <paulkon...@comcast.net> wrote:
>>
>>
>>> On Oct 20, 2016, at 6:05 PM, Noel Chiappa <j...@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.
Found it. 1976 Peripherals Handbook, page 6-4. It specifies the driver output
low voltage at 70 mA sink, not 50...
paul
