BUY D8257-5 https://www.utsource.net/itm/p/11741975.html

The Intel D8257-5 is a 40-pin CMOS programmable peripheral interface (PPI) chip. It is a general-purpose programmable I/O device designed to provide a wide range of I/O functions. The device can be used in a variety of applications such as data acquisition, process control, and instrumentation. Features: * 8-bit bidirectional data bus * Programmable I/O port * Programmable interrupt control * Programmable timer * Programmable clock * Programmable data transfer Applications: * Data acquisition * Process control * Instrumentation * Robotics * Automation * Industrial control (For reference only)