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? Does anyone have a listing of
ZRKJE0?
My RK11-D has the BC11 drive cable plugged into the backplane, but
the free end of the cable is just lying on the floor. No drive is
connected. The test fails with
RK11 LOGIC TEST I
MAINDEC-11-DZRKJ-E
REGISTER NOT CLEARED
PC REGADD RECVD
002560 177402 100000
177402 is the RKER register and bit 15 is DRE - "Drive Error".
According to the manual this bit is set when the AC power to the drive
is lost, which given that I don't have a drive at all, doesn't sound
unreasonable. Continuing ZRKJ?? also gives
REGISTER NOT CLEARED
PC REGADD RECVD
002560 177404 140200
RKCS ERROR
PC WROTE READ
002636 000002 140202
177404 is the RKCS register and the first two bits are ERROR and HARD
ERROR. These are both set by the DRE bit in RKER and aren't really a
surprise.
I'm starting to wonder if this diagnostic really works w/o a drive
attached, or if these errors are expected.
Thanks,
Bob
