Hi,
I'm in the process of upgrading an old Lecroy Wavesurfer Xs scope with a better CPU instead of the Celeron M320.
It's a BCM MX855LC mainboard with an Intel 855GME chipset with 400MHz FSB and the mPGA478C socket (
manual of similar board.
So I replaced the Celeron with a Pentium M765 SL7V3. But the PC isn't booting anymore. The fans spin, but no image or beep. I guess the BIOS version is too old and doesn't support Dothan CPUs. It's v1.02.
The manufacturer has a list of legacy hardware and theoretically still offers the old software for it (
http://www.bcmcom.com/bcm_support_driversAndBiosDownload.htm). But many links on the page no longer work and of course the one for the MX855. I couldn't find anything for the installed MX855LC. I guess it's the same BIOS firmware as for the MX855.
It works flawlessly with the Celeron. I ordered also two different CPUs (Intel Pentium M 1.6GHz SL6FA and Intel Pentium M 735 SL7EP) just in case I bought a broken one or the Dothan series isn't supported at all (not arrived yet). I also asked the manufacturer BCM for the latest BIOS version for the motherboard.
Does anyone have a newer BIOS version than v1.02 for the MX855LC mainboard or know how do you get the CPU running on this machine? It should be compatible.
Thanks for your effort

Best regards
Momchilo