At 6:11 PM +0200 4/8/2009, bo bengtsson wrote:
>
>Turn it off, how many minutes?

If the machine is plugged in, then it should 
maintain the trickle to the PRAM.  The battery 
power is only used after the machine is unpowered 
(unplugged) and the power supply's capacitors run 
down.

>What is PRAM

Macs have a small chunk of programmable / 
non-volatile random access memory (PRAM/NVRAM) on 
the motherboard.  It's used to maintain certain 
system settings - like from which disk volume to 
boot from.  When main power is not available, 
it's kept "alive" by the PRAM Battery (1/2 AA 3.6 
lithium) (also called a Backup Battery in some 
models).

>I turn“d it off tree times , it remembers clock all right.

Mac OS X has an ntp daemon that keeps the system 
time up-to-date by fetching a fresh time stamp 
from an atomic clock.  That means the 'ole trick 
of noticing the system time is foo only works if 
the machine cannot talk to the 'net.

- Dan.
-- 
- Psychoceramic Emeritus; South Jersey, USA, Earth

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