PDF reference sheet listed as a schematic and titled 28F512, a code used for 512 Kbit parallel flash memory of the 28F series. The name carries no vendor, package or speed information, so read those from the 104 KB document. It typically documents pin functions, programming and erase voltages, command sequences and timing. Useful when dumping or reprogramming older BIOS or controller firmware with a parallel programmer. Check supply and programming voltage requirements before writing, and save a copy of the original 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.