Archive for the FIC PCA50D board, revision 0.2, roughly 1.53 MB in RAR format. PCA50D is a First International Computer code, and the D suffix marks a variant of the PCA50 design also present in collections. Contents are unlisted, but schematic pages are likely. A technician uses them to trace supply rails, find shorted parts and locate test points. Since the PCA50 and PCA50D differ, confirm the exact suffix and Rev 0.2 on the board before trusting values.
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 @IT_SERVICE_WORLD. 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.
7-ZipWinRARThe Unarchiver (macOS)