Named 28C17A, this 138 KB PDF is catalogued as a schematic but the code points to a 16 Kbit class parallel EEPROM in the 28C series, A revision. Vendor and package are not stated. The document should list pinout, including any ready or busy output, timing and write procedure. Use it to choose the correct programmer device and to check whether a 28C16 type is a compatible substitute, since pin functions may differ. Confirm the marking on the chip and back up its data 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.