PDF filed as a schematic, named 28LV65, a code in the family of low-voltage parallel EEPROM memories. The name states no manufacturer, package or speed grade, so those details must be read from the 177 KB document itself. Such a datasheet gives pinout, supply range, read and write timing and the byte or page write protocol. It is useful when reading or rewriting the chip in a programmer, or when checking whether a substitute is compatible. Match the full suffix on the chip before selecting a programmer device profile.
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.