NCT5104D is an integrated circuit manufactured by Nuvoton Technology and is a member of their Super I/O series. The NCT5104D is an 8-bit ISA bus compatible LPC (Low Pin Count) Super I/O chip, with two serial ports, two parallel ports, two FDC (Floppy Disk Controller) ports, four general-purpose I/O ports, an EPP (Enhanced Parallel Port) interface, and a GPIO (General Purpose Input/Output) port. The NCT5104D also includes an 8 Kbit EEPROM (Electrically Programmable Read-only Memory) for storing configuration data. The NCT5104D is designed for use in AT (Advanced Technology) compatible motherboards and computers.