The fourth section of a numbered 16M-DRAM document collection, stored as a 536 KB PDF and indexed as a schematic. The title says only that it concerns 16-megabit DRAM. It gives no vendor, part number or package type. Material of this kind usually covers pin functions, address multiplexing, refresh cycles and AC timing, which helps when probing RAS, CAS and data lines on older boards. Confirm that the part number printed on the memory chip matches the document before trusting its pinout.
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.