Timothy A. Seufert
tas at mindspring.com
Thu Aug 30 06:48:51 EST 2001
At 4:16 AM -0800 8/29/01, Ethan Benson wrote:
>On Wed, Aug 29, 2001 at 04:38:51AM -0700, Timothy A. Seufert wrote:
>> It isn't enough to remove the main battery of a PowerBook -- all Macs
>> and PowerBooks have a tiny internal backup battery which keeps the
>> real time clock and NVRAM contents alive when the normal power
>> sources are not present. You have to disconnect it if you want to
>> reset anything. You also need to allow time for all capacitors to
>> fully discharge before the NVRAM is truly cleared (it's battery
>> backed SRAM, and SRAM can keep its contents alive on microamps of
>> current). Overnight usually seems to be enough.
>that won't even work on a NewWorld, since on newworld nvram contents
>are stored in flash.
Did work on a New World for me (B&W). Maybe only core99 & later use
flash for nvram?
I'll have to ask a guy I know at Apple about this. He works with
prototype hardware&firmware that have lots of bugs, so the various
reset procedures are permanently burned into his brain.
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
More information about the Linuxppc-dev