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Hello,

> The NVRAM is a separate SRAM chip which has an 8KB capacity.  Apple=20
> used several different pin compatible SRAM chips for this=20
> application, from such manufactures as Sony, Samsung and Winbond.=20
> The NVRAMRC file is stored in NVRAM and some other things.
>=20
> So PRAM and NVRAM reside in physically separate chips, and they are=20
> used to store different items, although I don't know which items go=20
> where in any kind of detail.
>=20
> I've tried replacing the 8K chip with a 32KB pin compatible chip, and=20
> the machine works as before, but it still only sees 8KB of NVRAM.  I=20
> guess the address space is built into the firmware or the wireing of=20
> the interface to the NVRAM chip.

Hmm, I remember some UMAX docs saying that one of the differences between t=
he PM9500 and the S900 was that the latter had twice the amount of NVRAM. S=
ince they used vanilla OF 1.0.5 as it came from Apple ( as far as I know th=
ey weren't allowed to mess with it which resulted in some annoying weirdnes=
ses  ) so either there's a way to use more than 8KB or they just got 16KB c=
hips cheaper than 8KB ones.

just my 2c
Michael

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