Chapter 3 Hardware Input Processing and Output Devices

Chapter 3: Hardware: Input, Processing, and Output Devices Most information in this presentation has been copied from the Dell. com web site

Agenda ¨ Computer System ¨ How to buy a computer ¨ Other Computer System Hardware

What is a Computer System? ¨ A computer system is a special subsystem of an organization’s overall information system used to input, process, store and output data and information. ¨ Putting together a complete computer system is more than just connecting computer devices. Components must be selected and organized with an understanding of the tradeoff between overall system effectiveness and efficiency, and considerations of cost, control and complexity. ¨ When selecting computer system devices, it is necessary to consider the current and future needs of the overall information system.

Computer System Hardware Components ¨ Computer system hardware components include devices that perform the functions of input, processing, communication, data storage and output of an information system.

Part I: How to Buy a Computer Most information in this presentation has been copied from the Dell. com web site

Dimension. TM XPS Gen 4: NEW! Extreme Performance with Expandability The most advanced Dimension ever built @ $5, 573 (configured system) ¨ Pentium® 4 Processor w/ HT Tech Extreme Edition (3. 40 GHz, 800 FSB) ¨ 4 GB Dual Channel DDR 2 SDRAM at 533 MHz (4 x 1 GB) ¨ 400 GB Serial ATA Hard Drive (7200 RPM) ¨ 256 MB PCI Express™ x 16 (DVI/VGA/TV-out) ATI Radeon™ X 850 XT PE ¨ 20 inch Ultrasharp™ 2001 FP Digital Flat Panel ¨ Dual Drives: 48 x CD-RW Drive + 16 x DVD+/-RW w/ double layer write capable ¨ 1 GB Compact Flash Card ¨ Dell Wireless Keyboard and Optical Mouse ¨ Dell 5650 5. 1 Surround Speaker System with Subwoofer ¨ IEEE 1394 Adapter ¨ 56 K PCI Telephony Modem

Pentium® 4 Processor w/ HT Tech Extreme Edition (3. 40 GHz, 800 FSB) ¨ ¨ ¨ The processor is the brain of a computer. It is also called the central processing unit (CPU). It interprets and executes instructions of computer programs or the operating system. In terms of computing power, the CPU is the most important element of a computer system. The combination of processor clock speed, architecture, cache, and front side bus decides the performance of a processor. Clock Speed: Speed of the processor's internal clock which dictates how fast the processor can process the data. Clock speed is usually measured in GHz (gigahertz, or billions of pulses per second). Architecture: Basic design of a microprocessor. It may include processor technology and/or other architectural enhancements. Cache: A temporary storage for frequently accessed or recently accessed data. Having certain data stored in a cache speeds up the operation of the computer. Cache size is measured in megabytes (MB) or kilobytes (KB). Level 1 Cache is a small, fast memory cache that is built in to the main chip and helps speed access to important and frequentlyused data. Level 2 Cache is a collection of built-in memory chips, slower than the Level 1 Cache but faster than the main memory area. Level 2 (L 2) Cache can help speed the operation of some applications. Front Side Bus: The connecting path between the processor and other key components such as the memory controller hub. FSB speed is measured in GHz or MHz.

4 GB Dual Channel DDR 2 SDRAM at 533 MHz (4 x 1 GB) ¨ Random Access Memory (RAM) is the workhorse behind the performance of ¨ ¨ the computer. RAM temporarily stores information from the operating system, applications, and data in current use. This gives the processor easy access to the critical information that makes the programs run. The amount of RAM determines how many programs can be executed at one time and how much data can be readily available to a program. It also determines how quickly the applications perform and how many applications can easily be toggled between at one time. Simply put, the more RAM the computer has, the more programs can be run smoothly and simultaneously. Upgrading your memory is truly one of the most cost-effective way to boost the system performance. Tests show that increasing memory from 128 MB to 256 MB increases system performance up to 37%. Increasing memory from 128 MB to 512 MB improves system performance up to 50%. DDR SDRAM: Double Data Rate Synchronous Dynamic Random Access Memory is memory that provides higher bandwidth than ordinary SDRAM memory. Frequency: The number of repetitions in a signal or waveform, measured in Mega-Hertz (MHz). A higher frequency improves system performance and speed. Dual Channel: Memory technology that delivers twice the peak bandwidth of the single channel memory.

400 GB Serial ATA Hard Drive (7200 RPM) ¨ The hard drive is the primary storage unit of the computer. It is where the ¨ ¨ operating system, applications, files and data are kept. RAID hard drive combines multiple hard drives into one disk to achieve the performance and security. RAID 0 (data striping) for maximum performance or RAID 1 (data mirroring) for data security. The video editor often utilizes RAID 0. User with the data integrity concern, often utilizes RAID 1. With RAID 0 all capacity on both hard drives is usable. With RAID 1 only half the capacity is usable and the other half is devoted to back-up. Storage Capacity: Why buy a higher capacity hard drive? - Higher capacity drives can store larger amount of data. It is necessary to buy a larger size hard drive or RAID in order to store digital video, audio file storage or to work with intense applications. Rotational Speed: Why Buy a Higher RPM Drive? - Rotational speed is a major factor in hard drive selection as it determines how quickly data can be retrieved. Typical rotational speeds are 5400 RPM or 7200 RPM for desktops, and 4200 RPM or 5400 RPM for notebooks. The higher the RPM (revolutions per minute), the less time is required for the computer to access the file. Interface (Parallel or Serial): Is interface important? - The interface is the link between the hard drive and the computer used to transfer data. It is important because it regulates the speed of data throughput from the system to the hard drive. The new SATA (Serial Advanced Technology Attachment) is the evolutionary follow-on to IDE. SATA is capable of higher data throughput than the UATA-100 interface.

¨ 256 MB PCI Express™ x 16 (DVI/VGA/TVout) ATI Radeon™ X 850 XT PE A video card is the part of the computer that transforms video data into the visual display you see on the monitor. The video card plugs into the computer's motherboard, and is responsible for decoding and processing the video signal. The quality of video on the monitor depends on both the video card and the monitor. More video card memory and faster graphics processors can result in more stunning and enjoyable visual effects when running games and programs with detailed graphic design. ¨ Memory: Video card has their own memory, which is reserved for storing graphical images. Video memory on a video card frees the computer's RAM, so the computer's memory does not have to store graphics. Video memory is available in standard sizes: 32 MB, 64 MB, 128 MB, etc. Typically, a card with a higher memory capacity will be capable of more advanced rendering and support for 2 -D and 3 -D graphics. It is better to have at least 128 MB video memory for performing the tasks of presentation, desktop publishing, gaming, or video editing. Processor: In addition to memory, video card has its own graphics processor for creating images. A graphics processor is specially designed for computing graphical transformations, and achieving faster graphics results than the general-purpose CPU used by the computer. An integrated graphics solution uses the CPU of your computer to create graphics that is slower than a video card with its own processor since it takes thousands of calculation to produce even basic images on the monitor. The video card processor is also known as the controller or graphics engine. ¨ PCI Express: PCI Express (PCIe) is the latest interface specification designed to improve a system's graphic performance by increasing its bandwidth. It helps speed the communication flow between the CPU and the graphics controller. This enhancement allows texture maps with greater size, detail, and realism. It also enables 3 D applications to run faster because of even higher bandwidth compared to AGP.

20 inch Ultrasharp™ 2001 FP Digital Flat Panel ¨ ¨ ¨ Size: The monitor is measured in inches and refer to the diagonal length from one corner of the monitor box to the other. The actual viewable area (or screen measurement) is the measurement in parentheses and labeled as VIS (viewable image size). The monitor is usually listed as: 17 -in (16. 0 viewable). This is very important when comparing flat panels to CRT's. A flat panel usually has the same VIS as its size category; a 17" flat panel has a 17. 0" VIS. However a 17" CRT may have a 16. 0" VIS or less as the width of the CRT bezel ? is included in the monitor size measurement. Also keep in mind that the most conventional CRT monitors are as deep as they are wide. Purchasing a flat panel display is more suitable for the limited space environment. Flat panel quality is determined by resolution. Resolution refers to the number of individual pixels contained on a display. The higher the resolution, the more pixels can fit onto the screen and so the sharper and more detailed images can be displayed. The resolution together with contrast ratio, brightness, and viewing angle determine the overall quality of a flat panel. CRT quality is measured in dot pitch or strip pitch. Dot pitch is the measure of space between a display's pixels; the smaller the pitch, the sharper the images. A measurement of . 27 mm is average for dot pitch. The monitor's viewable area, refresh rate and dot pitch all directly affect the display quality of a monitor. Active Matrix TFT LCD technology displays sharp, brilliant images with resolution ranging from 1024 x 768 to 1600 x 1200 pixels, depending on the display model. A wide viewing angle allows viewing from various angles without compromising image quality for the viewing flexibility or the multiple user viewing. Digital DVI functionality provides seamless digital connection, helping to maintain image integrity. ?

Dual Drives: 48 x CD-RW Drive + 16 x DVD+/-RW w/ double layer write capable ¨ The DVD+/-RW Burner is an all-in-one drive to read or burn DVD+R, ¨ ¨ DVD-R, DVD+RW, DVD-RW, CD-R and CD-RW discs, as well as read CD-ROM and DVD-ROM. What is Double Layer? The combination of a double layer DVD+/RW drive and double layer capable media support writing up to 8. 5 GB of data or video to a double layer DVD+R or DVD-R. 16 x is a measurement of CD or DVD drive speed. Each x translates to either 153, 600 bytes of data per second for the data rate of the CDaudio or 1, 250, 000 bytes per second for the data rate of the DVD-video. ? What is a CD-RW? A CD-RW will allow an user to create custom music CDs and data CDs for data back-up or data transfer purposes. It can also store and share video files, large data files, digital photos, and other large files with other people that have access to a CD-ROM drive. DVD+RW is a DVD-Rewritable disc, a DVD that can be written to erased many times (up to 1000).

1 GB Compact Flash Card / Other Storage ¨ The 1 GB Compact. Flash® (CF) Card retains data even if the system's power supply is switched off, thus offering significant data protection. The CF card features an integrated controller which stores all IDE and ATA commands, making the CF card fully compatible with all operating systems, utilities and application programs that support industry-standard IDE disk drives. Compact. Flash requires no special Flash File systems or drivers. ? ¨ The USB Memory Key is an active device with its own central processing unit (CPU) and is capable of supporting and running multiple applications directly from the product. ¨ Floppy drive records up to 1. 44 MB of data on a rugged 3. 5" removable magnetic diskette. Floppy disk drive has been available in the industry for many years and is ideal for inexpensively transferring small file from one computer to another, backing up the small amount of data, or creating a boot disk

Dell Wireless Keyboard and Optical Mouse ¨ The keyboard is the primary tool used to interface with the computer. It is a necessary and often overlooked component to an enjoyable computer experience. ¨ Key factors when choosing the right keyboard include comfort, convenience and ease of use. For customers who wish to minimize the appearance of wires/cords on their desktop, a wireless keyboard and mouse solution is available. ¨ Radio technology is used to communicate between the keyboard and the receiver There are three general types of keyboard technology: ¨ PS/2 - PS/2 technology is an older, stable and very reliable technology. PS/2 keyboards plug into the PS/2 connector ports located on the back of the computer. ¨ USB - USB technology is newer than PS/2: It is generally more responsive to the touch than PS/2. USB keyboards plug into the USB connector ports located on the back of the computer. ¨ Wireless - Wireless technology is fairly new in the marketplace: It was created to answer the customer needs for a clutter free desktop. Wireless products consist of the actual keyboard as well as a receiver. The receiver communicates between the computer and the wireless keyboard using either radio or infrared technology. Some wireless solutions include both the wireless keyboard and the wireless mouse. ¨ Great mouse performance! Optical technology records motion more precisely, glides more easily than a mouse ball, and has no moving parts to wear out or clean.

Dell 5650 5. 1 Surround Speaker System with Subwoofer ¨ Speakers are a good choice for improving the quality of multimedia presentations, online training / web casts, music listening, gaming, and DVD playback on the computer system. ¨ Dell 5650 5. 1 Surround Speakers: Total surround sound, great for listening to DVD-Audio, DVD-Video, or that 3 D audio gaming experience. Center channel speaker features unique flat panel mountable capability. ¨ Multi-Channel Audio: Many popular multimedia formats support multi-channel audio or surround sound. Dolby Digital 5. 1 DVD movies and Direct. Sound 3 D games support multi-channel playback. The stereo is two channels, meaning two speakers.

IEEE 1394 Adapter ¨ This adapter enables the computer to capture video from a digital camcorder or connect external hard drives. The IEEE 1394 adapter is a connection standard like the USB (Universal Serial Bus) and because of its ability to move data quickly (up to 400 Mbits/sec) it is primarily used to capture video from digital camcorders or to connect external hard drives.

56 K PCI Telephony Modems will be discussed in chapter 6.

Part II: Other Computer System Hardware

Computer System Types ¨ Personal Computers (PCs) are used by individual users ¨ ¨ ¨ (desktops, laptops, notebooks, sub-notebooks, Handheld (palmtop) Network computers are cheaper versions of PCs and are primarily used to access the Internet and other networks Workstations are high-end microcomputers and use RISC processors Midrange computers (mini computers) are systems that accommodate several users at a time Mainframe computers are large, powerful computers often shared by hundreds of concurrent users Supercomputers are the most powerful computer systems used often in military and research organizations trying to solve complex problems.

The Mainboard A mainboard is the foundation of the computer. Important mainboard components: ¨ Microprocessor Socket houses the Central Processing Unit (CPU). ¨ Memory Sockets are used to add memory to the computer. ¨ Expansion slots house controller cards. ¨ Buses transfer the data in the mainboard. ¨ BIOS (basic input/output system) gives the first instructions to the computer (look for BIOS that supports Plug and Play). ¨ Chip Sets control the memory I/O, the bus I/O, the interrupt requests (IRQs) and in many cases the hard disk controllers. If the CPU is the heart of the computer, chip sets are the pacemakers.

The Processor The processor or Central Processing Unit (CPU) is the heart of the computer because it ultimately controls all its functions. There are: ¨ CISC (Complex Instruction Set Computing) and ¨ RISC (Reduced Instruction Set Computing) processors

Execution of an Instruction The execution of a machine-level instruction involves two phases: the instruction and the execution phase. ¨ In the instruction phase (I-time): – Step 1: Fetch instruction – The control unit accesses the instruction from memory – Step 2: Decode instruction – The instruction is decoded and relevant data is moved from memory to the register storage area, and the location of the next instruction is identified ¨ In the execution phase (E-time): – Step 3: Execute the Instruction- The ALU does what is instructed to do (arithmetic operation or comparison) – Step 4: Store results- The results are stored in registers or memory § § Measurements Microseconds (1 millionth) Nanoseconds (1 billionth) Picoseconds (1 trillionth) MIPS

CPU characteristics ¨ Machine cycle time is the time in which a machine cycle occurs (instruction + execution phases). Machine cycle is usually measured in time intervals (i. e. microseconds) or MIPS (million instructions per second). ¨ Wordlength is the number of bits the CPU can process at any one time. Wordlenght is measured in bits (i. e. , 64 bits). ¨ Bus line width is the number of bits a bus line can transfer from the CPU to other components and is also measured in bits (i. e. , 64 bits).

RAM and ROM ¨ Random Access Memory (RAM) is a volatile primary storage location that the processor uses to store our data during processing. ¨ Read Only Memory (ROM) is a non volatile memory and as a result its content is permanent.

Cache memory ¨ Cache memory (SRAM-Static RAM) is a very fast and expensive memory type that holds data frequently used by the CPU so the CPU does not have to rely on slower RAM. When we talk about cache, we are usually talking about Level 2 cache (external to the processor). Many vendors will offer cache-less PCs at a lower price.

Controller Cards ¨ Controller cards are hardware devices that control the ¨ ¨ ¨ operations of hardware peripherals. Every component that is attached to the computer needs a controller card. The monitor needs a monitor controller card to function The hard drive and the floppy drives need a controller card Speakers attached to the computer need a sound card A CD-ROM needs a CD-ROM controller card The controller card must be compatible with the peripheral and the mainboard (i. e. , a VGA monitor needs a VGA controller card, a SCSI CD-ROM needs a SCSI controller card)

Ports ¨ Ports are hardware devices used to connect the computer with other hardware components called peripherals. Ports are the attachment points of these peripherals to the computer. ¨ Some peripheral hardware components are: the mouse, the printer and the CD-ROM drive ¨ Common port types are: – – The Serial Port The Parallel Port The Game Port USB Port

Other Input Devices ¨ Voice-recognition devices ¨ Digital computer cameras ¨ Scanning devices ¨ Optical data readers (OCR and OMR) ¨ Magnetic ink character recognition (MICR) ¨ Point-of-sale (POS) devices ¨ Automatic teller machines (ATM) devices ¨ Pen input devices ¨ Touch-sensitive screens ¨ Bar code scanners

Points to Remember ¨ Computer System ¨ How to buy a computer ¨ Other Computer System Hardware