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DeLong, Eric wrote:
Didn't IBM once store system information in the control panel? When a system was powered down for too long, the power for the cache memory ran out, and you needed to enter it again on next IPL.

Hmm, maybe this is what I'm thinking....

http://archive.midrange.com/midrange-l/200307/msg01368.html

Eric
Eric,

That was my experience with old 9404s where the control panel contains a battery and obviously some memory. I would not assume this is the same on other models. I've not taken apart a 170 control panel, but the only batteries I know of is the button battery on the motherboard and the battery pack on the RAID card. My guess is the system password state is stored on the motherboard.

AFAIK, system passwords are not reusable. Once it expires, the system generates a new password version code which is needed by IBM to generate you a new matching system password. The process is a nuisance worth avoiding.

Keith


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