The PC6524 is an integrated circuit produced by Microtran that is used as an 8-bit bidirectional parallel port (I/O) interface. It is designed to provide connections between general purpose computers, such as PCs, and various external I/O devices, such as printers, external drives, and scanners. The PC6524 incorporates all of the necessary components and functions of a parallel port interface onto a single chip. This makes it one of the most cost-efficient and space-saving I/O solution out there. The I/O operations which the PC6524 supports include acknowledge, select, data transfer, and reset. It also features data lines for receiving and sending data, an interrupt line, and a clock line. Furthermore, the PC6524 includes a number of protection features, including in-rush current protection and over-current protection, that protect the device from interference and other damages.