DRV11-WA info - test-drb@ccmp.vtda.org

12 May 2001

From: Chuck McManis &lt;cmcmanis(a)mcmanis.com&gt;

...
 The LSI-11 is "out of the loop" in this case.
The DRV11-WA can take over
the Q-bus and hold off the processor while it reads or writes memory
locations. That gives you the ability to deposit and examine stuff in 

Hard way to go.  ;)

...
 What we're missing is a way to load the PC on the
LSI 11 externally, but we
...
 can do some of that using an interrupt vector and by
manipulating one of
the vector locations to have the PC where you want the system to start. 

two locations 04 and 24 are candidates.  If memory serves 24 is
powerfail restart.

...
 Yes, its a kludge on a major scale, but its
blinkenlights :-) 

Yes, blinkin lights are cool but even in 1977 they were considered a
PITA rather than an aid save for special cases.  I busted enough
fingers on 8s, 11s and altairs/imsais to keep me unhappy.
I see putting blinkin lights on machines that never had them
to be a guilding the Lilly pointlessness.

Allison