Samsung NP-R20 Series Service Manual

11-611. ReferencesCo-ProcessorA specialized processor that performs calculations very quickly under the control of the CPU. Thereare two types of co-processors, a numerical co-processor and a memory manager co-processor.Numerical co-processor does arithmetic calculations or handles graphic processing. In a PC, co-processor is used to do floating point calculations quickly.COM PortAbbreviation of ‘Communications Port’. A COM port refers to the serial communication port providedby an IBM compatible PC. There are four COM ports supported: COM1, COM2, COM3, and COM4.These are used to connect a mouse or modem. Since COM 1 and COM 3 perform the samefunction and COM 2 and COM 4 perform the same function, avoid setting a mouse or modem to thesame port.BayA space within a PC case so that peripheral devices can be installed. In general, a hard disk drive,a floppy disk drive and a CD-ROM drive are installed in the bays. 5.25 and 3.5 inch bays areprovided.CMOSAbbreviation for ‘Complementary Metal Oxide Semiconductor’. It consumes little power and operateson battery power. The CMOS saves basic PC information such as the date, time and systeminformation. A main board has a ROM and a CMOS. The ROM contains a PC checking program andthe CMOS contains basic PC information such as the hard disk type. Since the data in the CMOS ismaintained by battery power, the data is lost if the battery is completely discharged.BusA collection of wires through which data is transmitted from one part of the computer to another. Youcan think of a bus as a highway on which data travels between parts such as the CPU, storagedevices and peripheral devices within a computer. All PC components use data bus to exchange dataor access memory.There are two types of data bus: address and data bus. Although actual data is transferred throughthe data bus, the destination of the data is sent via the address bus. The size of the bus refers tothe width of the bus which determines the amount of data that can be transferred at the same time.A ‘Bit Bus’ can transfer a bit at a time.Device DriverA program stored on the hard drive that tells the operating system how to communicate with aninput/output device such as a printer. You may think of it as dedicated software that controls adevice such as a printer. To use a new peripheral device, the corresponding device driver must beinstalled.- This Document can not be used without Samsung's authorization -