Part five of a multi-part PDF set labelled 16M-DRAM, filed as a schematic and only 145 KB, which suggests a short closing section. The name points to 16-megabit dynamic RAM documentation but states no manufacturer, chip number or organisation, so open it before assuming it covers a specific memory IC. Read it alongside the other numbered parts for pinouts, timing diagrams and refresh requirements. Compare the device markings on the board with what the document describes before using its pin assignments.
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.