Building a PDP-11 for the first time - test-drb@ccmp.vtda.org

14 Dec 2003

On Dec 14, 14:01, Megan wrote:

...
  In fact, I have taken a KDJ11-B board with an 18Mhz
clock,
 removed the clock chip and replaced it with a 20Mhz clock
 and the system ran solidly (I still have it).  It also
 correctly identifies, in the boot rom, that the machine has
 a 20Mhz clock... 
I've done that too.  I also have a dual-height running at 18MHz, but I
know that one gets flaky at anything higher.

...
  I don't have specific information about an FP
bug... I remember
 that some boards couldn't have the FPA installed due to some
 bug but don't have the specifics. 
Somewhere in my piles of ol DEC stuff I have a note about which ones
can/can't/already do -- but I'm not sure exactly where it is, nor
whether that's an official original DEC document or a maintenance
company one.  As far as I remember, it was described as a bug in one of
the ASICs.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York