From: "O. Sharp" <ohh(a)drizzle.com>
That said... I'd try other commands that affect
the AC (TAD would be a
good candidate) to see if they did anything out of the ordinary. Hope-
fully they won't <g>, and that would narrow down the search. If the
problem is confining itself to rotates, it would be worth trying each
of the four rotates (RTL, RAL, RAR, RTR) to see if all of them are
malfunctioning or just a subset of them. The rotate signals are all
generated on the same card - the M617 at E31, if the 8/L and 8/I
share the same backplane layout - so that might be a good starting-
point to look for trouble. (Look for the page "Shift & Carry Gate
Control" in the schematics. The rotate signals go from there to the
"Major Register Gating" page, where they choose the rotate-data to
be gated into the AC.
That M617 is at B09 in an 8L, according to my copy of the schematic.
Vince