H3100 flash

Hi,

I just opened up my H3100 to perform some modifications (converting it
from stereo out to mono out + mic in, among other things; currently
looking to see if I can set it up so that the internal speaker is left
and the audio jack has right) and noted something odd:

There's a single intel E28F128 flash memory chip there, and blank pads
next to it. There are blank pads for two different sizes of flash chips,
one the same as the existing chip, and the other with slightly fewer
pins.

Is anybody aware of what the differences are between the two chips that
are accepted? Also, can I just solder (with an SMT rework station; not
gonna even think about using a rat shack iron) a new flash chip on there
to get myself 32MB?

On a more insane note, there's a lot of free space (relatively speaking
:) inside here. It looks to me like there's the physical space for more
flash memory chips. I'm wondering about the possibility of soldering a
(very, very) low profile connector on there, with a thin PCB, addressing
circuitry, and more flash chips. I'd _love_ 6 or so 16MB flash chips
here. I'm not sure if there's be speed issues with addressing, requiring
wait states, but with 128MB of DRAM (gonna upgrade when the chips get
here) I'd be happy to have a big cache and take a performance hit for
that much speed...

Final question: which connector is the JTAG connector? I'd like to
ensure I can recover before I upgrade flash memory...

Thanks,

gopi.
Received on Tue Aug 14 2001 - 18:04:21 EDT