A 3.50 MB PDF datasheet from Microchip describing the PIC16C717, PIC16C770 and PIC16C771 microcontrollers in one shared document. These are one-time-programmable or windowed EPROM parts, so a blank replacement must be programmed with the original firmware rather than simply swapped. The datasheet gives pin diagrams, analog peripheral details, register maps and DC/AC electrical limits. Use it to locate supply, reset and clock pins when diagnosing a dead controller, and match the exact part number and package marked on 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. 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.