> On Jul 9, 2020, at 5:02 PM, Robert Armstrong via cctech
> <cct...@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.
