henk.gooijen at oce.com
Tue Jan 17 06:37:48 CST 2006
I am working on the last peripheral device connected to
my 11/34, two RK07s. This will be my first experience
with RK07 drives, so I have a few questions.
I installed the RK611 in the system (in an expansion box)
and made sure that the UNIBUS is OK. The 11/34 starts, and
I can boot RT11 from DL0:. ".SH DEV" shows that the DM.SYS
driver is installed. However, after loading a pack the RT11
commands ".DIR DM0:" or ".INIT DM0:" report an error.
I must say that the READY light did not turn ON on the drive.
I switched the 11/34 OFF, because I think I need to take a
closer look at the RK07 drive itself first.
Here is what I did and saw.
I removed the metal cover at the top-rear side. Now you can
see the big magnet and the head assembly. I first checked
the "emergency retract" mechanism. When you push down the
lever that locks the heads, and gently push the head assembly
forward toward the cartridge compartment, the heads are pulled
back as soon as the little microswitch is (dis)engaged.
Then I loaded a pack and pushed the LOAD button.
After some 20 seconds the disk has spun up (I assume), because
the heads start to move.
The heads first move at a moderate speed toward the centre of
the cartridge (I would say a full travel), stop, and then move
back at that same speed, but not completely to the home position.
Again, I *assume* that the heads detected track 0 and stay there.
However, the READY lamp does not go ON. It could not, because
the lamp was defective :-) After replacing the lamp with a
checked-good lamp, I repeated the exercise. The heads show the
same movement, but the READY light stays OFF.
1. Is that head movement behaviour correct?
I will try to make a movie of the movement this weekend ...
2. What would the head movement be if the pack was bulk-erased?
3. Should the READY lamp go ON?
An other thing I noticed.
As the 11/34 is OFF, there is no controller connected to the
RK07 drive. OK, it is, but not powered.
With the RL drives the FAULT lamp will be ON if the controller
is not powered. Is this the same for the RK07?
The RK611 controller is not powered, but the FAULT lamp stays
OFF. I did check that the lamp is OK. Is this correct behaviour?
- Henk, PA8PDP.
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