A schematic diagram. Shared as “ms-7420N1-0C.pdf” — a .pdf file, 1.18 MB.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @ShareMan_Electronic_Files. Enginerys does not host this file.
The standard format for schematics, block diagrams, power-sequence charts and service manuals.
PDF schematic covering the MS-7420N1 board at revision 0A, tagged 970121-B, which is most likely a dated drawing release with a B suffix.
PDF schematic for the MS-7420 board, variant N1, revision 0B, with 970317 in the name, possibly a date in the Taiwanese Minguo calendar, which would mean March 2008.
Schematic in PDF for an MS-7420N1 mainboard, revision 0D, with the extra code 970609 in the name, which looks like a date or build stamp.
Schematic PDF for a board identified as MS-7420, variant N1, revision 0C, judging by the MSI-style number in the file name; no brand field is attached.
Schematic of the MS-7420 N1 variant at revision 10, with 970721 in the file name, likely a Minguo-calendar date corresponding to July 2008.