7 Dec
2009
7 Dec
'09
4:03 a.m.
Pontus Pihlgren wrote:
I'm sure XXDP will tell you more, but you can also get some basic
diagnostic information back from the drive just by manipulating a
couple of registers. Near the end of the technical manual there are
some toggle-in programs which, although rudimentary, allow you to do
some simple checks without even requiring a working boot device.
According to my notes, the following can be used to read back the
status of a drive:
* Deposit a 3 into the DAR at 774404 (13 if you want to reset the drive)
* Deposit a 4 into the CSR at 774400 (404, 1004 or 1404 for units 1, 2 or 3)
* Wait for the operation to complete
* Read off the contents of the MPR at 774406
If you do that when the fault light comes on (without resetting) it
should tell you what kind of fault you're dealing with. There is a
table somewhere in the manual that describes what the different bits
of the MPR signify.
Cheers,
--
Steve Maddison
http://www.cosam.org/
Tomorrow
I'll will try to boot an XXDP pack from RL01. I've hooked it up
and the controller seems to talk to the drive at least.
A short follow up. I've booted XXDP from one of my RL01 drives, the other
lights the FAULT light when I press LOAD. I hope XXDP can give me some more
information, but likely I'll replace it with an RL02 which I hope to revive.