PDF of 97.3 KB listed as a schematic and named 28C512-513, covering two related parts from the 28C parallel EEPROM family in one document. No manufacturer or package is stated in the name. Expect pinouts, page write behaviour, data polling and timing tables for both variants. It helps when identifying the memory on an older controller or instrument board and choosing the matching device in a programmer. Read the exact part number on the chip to tell which of the two variants applies 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.