Named 2764a, this 99.2 KB PDF sits in the schematic category, with the trailing a likely marking a revised version of a 2764 part. The name gives no maker or device, so read the header to be sure what it covers. Numbers of this pattern correspond to the 27-series parallel EPROM line, whose reference sheets show pinout, programming voltage and timing. Check whether your chip carries the A suffix, since revised parts can need different programming conditions, and back up the chip before writing.
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.