BUY R6520AP R6520-13 https://www.utsource.net/itm/p/1248771.html
Peripheral Interface
Description: The R6520AP is a 40-pin DIP microcontroller from Rockwell. It is based on the 8-bit MOS Technology 6502 processor and features a 4K ROM, 1K RAM, and an 8-bit I/O port. Features: 8-bit MOS Technology 6502 processor 4K ROM 1K RAM 8-bit I/O port 40-pin DIP package Applications: The R6520AP is suitable for use in a wide range of applications, including embedded systems, industrial automation, robotics, and consumer electronics. It is also used in some arcade games, such as the classic Pac-Man. (For reference only)