PDF datasheet for the SED1335, about 398 KB. The SED1335 is a well-known Epson graphic LCD controller used in many 320x240 class monochrome display modules, driving external display RAM and the panel drivers. The document typically explains the pinout, microprocessor interface, command set, memory mapping and timing. It helps when reviving older industrial or instrument displays, checking oscillator, reset and data bus lines. Verify the chip marking, since compatible clones such as RA8835 are often fitted instead.
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 @acodis_lcd_datasheets_EDID. 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.