13.20 Hardware ●●● ●●●● ●●●●● ●●●● Connections(Attachments) ●●●0● ●●●0 Port o A connection point serial port, a parallel port Bus(daisy chain or shared direct access) o a set of wires and a rigidly defined protocol e PCL SA, SCSI Device Controller o Is a collection of electronics that can operate a port, a bus or a device Serial port controller o scsi bus controller ●| DE controller8 13.2 I/O Hardware ⚫ Connections (Attachments) ⚫ Port ⚫ A connection point ⚫ serial port, a parallel port ⚫ Bus (daisy chain or shared direct access) ⚫ A set of wires and a rigidly defined protocol ⚫ PCI, ISA, SCSI ⚫ Device Controller ⚫ Is a collection of electronics that can operate a port, a bus or a device ⚫ Serial port controller ⚫ SCSI bus controller ⚫ IDE controller