HCL P21 PDC BIOS image, packed as a 458 KB RAR archive, the same size as an unbranded P21 PDC file, so they are likely identical. PDC probably stands for Pentium Dual-Core, though the name does not say so outright. Useful for reflashing the firmware chip on a P21 board that fails to POST. Unpack it, confirm the model, compare the image size with the flash chip capacity, and back up the original contents with your programmer before writing anything.
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 @biosarchive. 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 →