The Unibus Analyzer is a diagnostic tool
for examining and diagnosing problems on the Unibus. It can be
used alone or with a 'scope and/or logic analyzer. LEDs are
provided for direct monitoring of all of the Unibus signals.
Comparitors are provided to allow for triggering a 'scope or
logic analyzer when an address and/or data value is matched. All
of the signals are brought out to header blocks for easy probing and
access. Each signal on the headers are paired with a ground for
easy attaching of probes.
Here's the UA11 plugged into an 11/34
while it was running XXDP.