DRV11-WA info

From: ajp166 <ajp166_at_bellatlantic.net>
Date: Sat May 12 16:59:18 2001

From: Chuck McManis <cmcmanis_at_mcmanis.com>


>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
Received on Sat May 12 2001 - 16:59:18 BST