Catalogued as a schematic, this 140 KB PDF carries the name 28F002, a part code from the 28F flash memory series, typically a 2 Mbit boot block type. The name states no manufacturer, top or bottom boot variant, or package, so check the document and chip marking for those. It provides pinout, block layout, command sequences and timing. Useful when reprogramming legacy BIOS chips, since the boot block arrangement affects how an image is written. Back up the original chip contents first.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.