The second RL11 controller
The second controller came with a label:
The drive does not show "ready" when connected to this controller. So let's go to work on it..
RLZID1 test failures
The next test is RLZI.
This test fails with:
CZRLI HRD ERR 00101 ON UNIT 00 TST 015 SUB 002 PC: 037702
DIFF OF 1 SEEK TEST
OPER: SEEK
FROM 002 DIFF 002 SGN 0 HD 0
RESULT: DRV STATE IS 5 SB 4
BUS ADD=174400 DRV=0
RLCS RLDA RLBA RLMP CYL HD
OP INIT = 000106 000401 000000 000000
OP DONE = 000304 000003 000000 000235 002 0
ERR HLT
A second try also failed:
CZRLI HRD ERR 00101 ON UNIT 00 TST 015 SUB 003 PC: 037702
DIFF OF 1 SEEK TEST
OPER: SEEK
FROM 000 DIFF 002 SGN 1 HD 1
RESULT: DRV STATE IS 5 SB 4
BUS ADD=174400 DRV=0
RLCS RLDA RLBA RLMP CYL HD
OP INIT = 000106 000425 000000 000000
OP DONE = 000304 000003 000000 000335 000 1
ERR HLT
And a third:
CZRLI HRD ERR 00101 ON UNIT 00 TST 015 SUB 002 PC: 037702
DIFF OF 1 SEEK TEST
OPER: SEEK
FROM 002 DIFF 002 SGN 0 HD 0
RESULT: DRV STATE IS 5 SB 4
BUS ADD=174400 DRV=0
RLCS RLDA RLBA RLMP CYL HD
OP INIT = 000106 000401 000000 000000
OP DONE = 000304 000003 000000 000235 002 0
ERR HLT
The description for test15 reads:
For this test it is useful to look at the RL02 command word which has the following format:
As can be seen the seek operation works on deltas; a seek is done by sending a delta cylinder address and a sign (upwards, downwards) to the drive. Looking at the first and third error I think we see that the test expects the drive to be on cyl 2, and it sends a command with a delta of +2. This should make the drive arrive at cyl 4, and it appears that it doesn't.
The RESULT line shows that we got drive status 5 while we expected drive status 4. The drive status register looks like this:
The message apparently talks about state, not status, so those bits have the following values:
So, state 5 would be "Seek-linear mode (lock on)", and state 4 would be "Seek-Track Counting". Reading time..