A 171 KB PDF named 27c010, categorised as a schematic, though the number marks it as a part from the 27C CMOS EPROM line. No device, brand or board appears in the name. Technicians use this kind of datasheet to check the pin diagram, operating and standby currents, timing, and the programming algorithm before reading or writing the chip with a universal programmer. Keep a backup image of the original contents and confirm the exact vendor marking and speed grade on the part.
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.