SN74148N datasheet in a 31.8 KB PDF, describing the 8-line to 3-line priority encoder in a plastic DIP package. It includes the pinout, the active-low input and output truth table, cascade enable signals and electrical data. It helps when checking interrupt or keyboard encoding logic on vintage boards, where you need to know which input has priority and what code should appear on the outputs. Check the exact marking and logic family before replacing the chip.
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 @datasheet_technar_org. 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.