Short PDF of 76.2 KB covering the 24C16, a 16 Kbit (2 KB) serial EEPROM accessed over the two-wire I2C bus. The file name has only a trailing underscore and gives no maker, device or board details, so it should be read as a component datasheet rather than a circuit diagram. It is handy for confirming SDA, SCL and WP pin locations before in-circuit reading with a clip and programmer. Always dump and keep the original data before erasing or writing new contents.
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.