23 Oct
2016
23 Oct
'16
11:59 a.m.
On 10/23/16 11:50 AM, shadoooo wrote:
The problem is that there aren't open drain bus
transceivers, but the
problem could be solved simply using input-only and output-only components,
connecting two in parallel but opposite direction on bidirectional pins.
The reason for using the old parts is the logic thresholds are unique to
the Unibus to handle worst-case bus loading and the termination voltage they
used.