9 Jul
2020
9 Jul
'20
5:20 p.m.
On Jul 9, 2020, at 5:02 PM, Robert Armstrong via
cctech <cctech at classiccmp.org> wrote:
I have an 11/04 with an RK11-D. I have a couple of RK05s, but I wanted to test the
controller before I start working on the drives. The PDP11 Diagnostic Handbook says that
ZRKJ?? "checks only the drive-independent logic of the RK11 controller. no drive is
needed..." I assumed that meant it was a diskless test, but now I'm not sure
that's true. Can anyone confirm or deny this?
Hi Robert,
My experience with an RK11-C on a PDP-11/45 is that the drive-independent diagnostic does
in fact work with no drives attached. For the RK11-C at least, it does clever things with
maintenance-mode to simulate signaling that would source from the drive where necessary.
I know there are some differences between the RK11-C and the RK11-D -- if some of these
are related to maintenance mode, it could also be that you need to verify that the version
of the diagnostic you are running is RK11-D (and not just RK11-C) aware?
Another possibility is that you should pull the BC11 and add another terminator rather
than leaving it dangling?
--FritzM.