Chipset: Northbridge: Intel Brookdale GL (i865G)
Southbridge: Intel ICH4 (FW82801EB)
Your mboard is probably an OEM only model - made only for brand name system builders - there is probably no info about it on the MSI web site.
Retail Socket 478 mboards list here - ones with 865Gxxx would be very similar
If you need pinouts, e.g. for USB headers, front panel (power switch, power led, hdd led, etc.) , front audio and mic, other retail mboards with the 865Gxxx main chipset and and 67xx model numbers probably have identical pinouts - look them up on the MSI web site.
If you need drivers -
main chipset and onboard video drivers for the 865 series - the Intel web site
- X86's link
- if you search with: MS-6772 Ver. 1 drivers on the web, there are"hits" for drivers for it.