Labelled 27c4096, this 111 KB PDF sits in the schematic section but the name is a part number from the 27C CMOS EPROM series. Nothing ties it to a specific laptop, board or brand. Sheets like this give the pin layout, bus organisation, electrical limits and programming algorithm. Repair staff rely on that when reading out or rewriting firmware with an EPROM programmer, or when sourcing a replacement. Save a backup of the original chip first, and match the speed and package code.
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.