A small 105 KB PDF filed under schematics, with a name pointing to the 85C72-82 range. The name gives no device, brand or board number, and the code resembles a component series designation, so expect a part datasheet or family sheet rather than a full circuit diagram. Open it in any PDF reader. Before using it to choose a substitute, confirm that the exact suffix printed on the component falls inside the 72 to 82 span the title suggests, and check the package and pin assignment.
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.