BIOS archive labelled PHN15008, 481 KB in RAR format. The name gives only a short code with no brand, revision or board number spelled out, although the PHN prefix appears in other Philco-related files; treat that as unconfirmed. Images like this are used to reflash the SPI chip of a board that no longer boots. Before relying on it, identify the board from its silkscreen, read and save the original chip with a programmer, and check that the image size matches the flash capacity.
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 @afsbiosfree. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →