On 19/6/05 5:17 pm, "Mike" <[EMAIL PROTECTED]> wrote:
> How do you tell the size of the ROM before purchasing it?
It's not possible to accurately tell the size of the rom without
attempting to flash it. The rom is an 8 pin soic serial flash chip - mostly
made by ST Microelectronics, Atmel etc and printed with the chip id....
(m) 25po5 is the id for a 64k (512 megabit) chip
(m) 25p10 is the id for a 128k (1024 megabit) chip
But many of the chips are mislabelled - some 25p05 turn out to be 128k -
which is the size reguired for the full mac rom. An attempt to flash a
genuine 25p05 with a 128k mac rom on a pc using dos commands will result in
an error at 65536 (64k) bytes as the chip has only half the capacity
required - a mac will not usually boot with a pc version card installed but
if you can boot an attempt with the mac flasher will stop at 50%. The chip
can be desoldered and replaced with a 25p10 or you can try a reduced mac rom
from various sources on the net. To add to the misery some cards have
'blocks' which prevent a flash greater than 64k. If you have some experience
of surface mount soldering the chip replacement is not too challenging - if
you don't the traces and pads are easily damaged beyond repair.
Pete
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