BUY R6520-26 https://www.utsource.net/itm/p/561495.html

The R6520-26 is a 40-pin DIP microcontroller manufactured by Rockwell. It is a single-chip 8-bit microcontroller with a built-in ROM, RAM, and I/O ports. It is designed for use in embedded systems and industrial applications. The R6520-26 features a 16-bit address bus, 8-bit data bus, and a 4-bit instruction bus. It has an internal ROM of up to 4K bytes and an internal RAM of up to 256 bytes. It also has two 8-bit I/O ports, one 16-bit timer, and one 8-bit timer. The R6520-26 is used in a variety of applications, such as industrial control systems, automotive systems, and medical devices. It is also used in consumer electronics, such as digital cameras, MP3 players, and portable gaming systems. (For reference only)