NWS-3460 memory map

I have just replaced the NVRAM chip in a friend's NWS-3460.
Unlike a MIPS or Sun, the Sony doesn't have the problem
of the MAC or host/machine id being programmed on the chip.

I would like to correct the date.
Does anyone have an layout of the memory?
I know the user's manual specifies the direct memory,
KSEG0 and KSEG1 memory ranges.

Thank you
Mick Carberry