Hardware Notes Word

COMPUTER : Common Operating Machine Particularly used for Trade Education & Resource purpose. Def: Is an Electronic Machine which takes the raw data, process the raw data & gives the meaning full output. Advantages : Accuracy ,Speed , Storage. Computer is divided into 3 categories : 1) Hardware 2) Software 3) Firmware 1) Hardware : All the electronic, Mechanical , Physically parts of the computer combinedly called as Hardware. 2) Software : Is a set of instructions upon which the computer acts is called Software. Software is classified into a) System s/w b) Application S/w. A) System Software: The software that instructs the computer to control & manage its internal functions called as Eg: DOS , WINDOWS LINUX, Etc. B) Application Software : The Software which performs a particular data processing job on system is called as software. Eg : MS-Office , Tally, Game s/w Etc. Generations Of Computers First Generation : Starts at 1946 , components used in first Generation is :     

Vaccum Tubes around 17,468 Resistors 70,000 Capacitors 10,000 Relay 1,500 Switches 6,000

The first generation machine named as ENIAC ( Electronic numerical integrated and calculator) The first generation machine consumes Electricity of 100 kwatts. 2nd Generation : Starts at 1958 upto 64 , these were made of Semi-conductors (Transistors, Diode, insulators ) •

Magnetic Disk (Storage device)is introduced during this generation.

 

reduces power consumption by avoiding vacuum tubes reduces space consumption .

3rd Generation : Starts at 1965 –76    

Integrated Circuits were developed. Technology used SSI (Small Scale Integration ) & MSI (Medium Scale Integration) SSI is equivalent to 10 Transistors MSI is equivalent to 100 Transistors.

4th Generation : Starts at 1977-till date •

Technology used is LSI (Large Scale Integration) & VLSI (Very Large Scale Integration)

system software. Application

 

LSI equivalent to 1000 Transistors. VLSI more than 1000 Transistors.

5th Generation : This Generation computer is using Artificial Intelligence ,& still under research. : Back Panel of Computer :

1) 2) 3) 4) 5) 6) 7) 8) 9) 10)

Key Board : 5 pin Din Connector / 6 pin mini Din Connector. Mouse : D-Shaped 9 pin Male Connector. Scanner : D-Shaped 25 pin Male Connector.(Serial Port) Printer : D-Shaped 25 pin Female Connector. (Parallel Port) VGA : D-Shaped 15 pin 3 row female Connector. Mono : D-Shaped 9 pin 2 row female Connector. Joystick : D-Shaped 15 pin 2row female Connector. RJ-45 : 8 pin female connector used for LAN. MODEM : RJ-12 4 pin. USB : 4 pin Male connector used for webcam, digital cameras, light pens.

Types of Motherboards There are two common types: The AT and ATX

Full and Baby AT Advanced Technology (AT) motherboards were introduced in 1984 (around the time of the Intel 80286 processor). They measure approximately 12 by 13 inches and typically support 80286 or older processors, 5.25 inches floppy drives, and 84-key keyboards. A smaller version of the AT motherboard, typically measuring around 8.5 by 13 inches was later released. This type was called the Baby AT, Baby AT motherboards might contain SIMM and/or DIMM memory slots and 80386, 80486,or Pentium processor slots. Baby AT motherboards also use the 3.5-inch floppy drive rather than the older 5.25-inch drive. AT motherboard use of a DIN-5 keyboard connector, two power connector ports (for P8 and P9 connectors), and support for ±12 and ±5vDC only.

ATX The ATX motherboard was released by Intel in 1996 and is the most commonly used form in new PCs. The ATX is the same size as a Baby AT motherboard but has a different orientation and layout the processor is located further from the expansion slots, and the hard drive and floppy drive connectors are located closer to the bays on the chassis. The ATX motherboard also includes integrated parallel and serial ports (I/O ports) and a mini-DIN-6, rather than a DIN-5, keyboard connector. The ATX motherboard’s power supply uses a single motherboard connector and supplies voltages of ±12, ±5, and +3.3vDC.

HARD DISK Hard disk is a storage media, Its capacity is measured in terms of GB. Hard is a Aliminuim air-tight sealed.

Components of the Hard disk : * Chasis : It is a Air-tight packed unit. in older HD Iron metal used for chasis. * Platter : Is nothing but the circular plates inside the chasy , fixed to a Spindle MOtor & the pltters are coated with the Magnetic Material like Ferric oxide, cobalt oxide, glass and cyramic. Data is stored onto the platter in the form of magnetic field, with the help of head. At the MFG time Tracks & sectors will be created on to the platter. Each side of the platter is called as side 0 & side 1 attached with its corresponding heads. concentric cirles on the platters is called as Tracks. * Head : IS winded with a copper coil , the head is connected with the Actautor or Arm which guide the head movement step onto the Tracks.

Types of Hard Disk : 1) ATAPI (Adv.Tech Attachment Packet Interface) It supports 2 HD one as Master and the other as slave, it cannot supports cd-rom Drive The CD-ROM drive has to connect to the separate interface. Data transfer rate is very less i,e < 5 MB/sec. 2) IDE/ATA : SUPPORTS 2 HD as master & Salve , also supports CD-ROM Data Transfer rate is 5 to 8 MB. 3) IDE/ATA 3 : SMART tehnology is introduced. DATA Transfer rate is 16 MB/Sec. 4) Ultra DMA/ 33 : DMA is introduced in HD, with the help of DMA HD is able to communicate directly with the RAM Data Transfer rate is 33 MB/Sec. 5) SATA (Serial Adv.Tech Attachment) : NOTE :At the time of MFG of Hard disk Tracks and sectors are created.

by step

* Each Track consist of 63 Sectors / Track. 1 Sector = 512 bytes 8 Sectors = 1 Cluster Cluster : Group of Sectors called as Cluster.

SCSI HARD DISK Types of SCSI Hard Disk : Standard SCSI : SCSI Hard disk uses a separate SCSI interface card to connect the Hard Disk onto the Mother Board. The PCI Slot is used to connect the SCSI interface card. The single Interface, we can connect 7 storage devices. The HD should be connect in the sequence order. Wide SCSI : Supports 0-15 devices to a single cable. data transfer rate is 100 MB uses 50 pin / 50 wires. Ultra SCSI : 0-31 SCSI HD can be connected to a single cable Data Transfer rate is 150 mb /sec. Uses 68 pin / 80 wires.

HARD DISK CABLES: FRC CABLE : 40 PINS / 40 WIRES, 20 Odd-NO of wires acts GND, 20 Even no of wires acts as Signals. ULTRA Cable : 40 pins / 80 wires SCSI Hard Disk uses 50 pins / 50 wires WIDE SCSI : 50 pins / 50 wires connector is Male Berg connector. Ultra SCSI : 68 pins / 80 wires connector is Male Berg connector.

: FLOPPY DISK DRIVE (FDD) :

Floppy Disk is classified into 2 sizes : a) 5 1/4 Inch FD b) 3 1/2 Inch FD 5 1/4 Inch floppy is devided into sizes a) 360 KB & b) 1.2 MB 3/12 Inch Floppy is devided into sizes a) 720 KB b) 1.44 MB c) 2.8 MB

SIZE Media density 5 1/4

3 1/2

Track

Sector

Capacity

DD

40

9

360 KB

HD

80

15

1.22 MB

DD

80

9

720 KB

HD

80

18

1.44 MB

Extra HD

80

36

2.8 MB

Material : 5 1/4 Floppy Disk made up of miler plastic coated with magnetic material like Iron-Oxide, Cobalt-oxide , Ferric Oxide . Cover used is thick paper. Cover used is plastic. : Physical Parts of the 3 1/2 Inch floppy : a) R/W Protect Notch : IF hole is closed is not a write protector (Read / write permission) If hole is open it is write protect (ONLY Read permission) b) Media type : is used to identify the difference between High Density & Double density. If the hole is there High density. If the hole is not there Double Density. : Internal Parts of the Floppy Drive : 1) HEAD : It is a coil winded by a very thin copper wires, used for the R/W Operation.

Data will be stored as Magnetic ENERGY from electrical Energy. 2) Head Mechanism : Is is responsible for the To & Fro movement of the Head.it has 2 types Belt Drive Mechanism: Used in 5 1/4 floppy. Screw Drive Mechanism : used in 3 1/2 floppy. 3) Motor : In floppy drive 2 motors used a) Spindle Motor b) Stepper Motor. Spindle motors: Is responsible for rotating the disk at a speed of 300 rpm. Stepper Motor : IS responsible to guide the movement of the head using screw drive or Belt Drive. 4) Sensors : a) Write protect Sensor : Micro switch sensor. b) Disk Change sensor : Micro switch c) Media type : Micro Switch sensor. d) Index hole Sensor : Mechanical Sensor. e) Track Sensor : Opto coupler Sensor. : SLOTS : 1) ISA SLOT : This is the first type of slot, this is an 8-bit slot, i,e 8 bits of data transmitted by this device, data processing speed of 8 MHZ usually used in the Old M/B to connect Sound cards & modem cards etc. Black in color. 8-bit ISA has 62 pins arranged in 2 rows . 16-bit ISA has 98 pins arranged in 2 rows. 2) PCI (Peripheral Component Interconnect) : PCI slots contains the 122 pins arranged in 2 rows. It process the data 32 bit data at a time. PCI slots are smaller than ISA Slot, generally White in Color. PCI slots are used to connect the SCSI Interface Card, NIC Cards, MODEMS ETC. 3) AGP(Accelarated Graphic Port) : AGP SLOT Contains 124 pins arranged in 2 rows.

it is particularly designed for video only, it is generally considered as port which establish 3) AGP(Accelarated Graphic Port) : AGP SLOT Contains 124 pins arranged in 2 rows. it is particularly designed for video only, it is generally considered as port which establish a direct link between the Processor & the Video Card. AGP is of 32-bit, AGP looks as similar as PCI Slots but AGP card is not compatible with PCI. The AGP runs 4 to 8 times faster than PCI Slot. AGP cards are rated as 2X(5 MBps), 4X (1.7 GBps), 8X (2,2GBps). Process the data at speed of 66 MHZ. : IRQ VALUES : (Interrupt Request values) 0 -> Timer 1 - > Key Board. 2 - > Free 3 - > Com2 ,com 4 . 4 - > Com1, Com 3 . 5 - > LPT 1 6 - > FDD Controller 7 - > LPT 2 8 - > RTC 9 - > Free 10 - > free. 11 - > Free. 12 - > Mouse. 13 - > co-processor. 14 - > Primary IDE 15 - > Secondary IDE. : PRINTERS : PRINTERS : IS used to transform the text and Graphics from pc into Hard-copy i,e on paper.

Printers are classified into a) Impact Printers b) Non-Impact Printers. a) Impact printers (Daisy wheel) (Dot-Matrix) : This kind of printer moves a print-head across the ribbon & print head strikes the ribbon to form an images on paper. a) Daisy-wheel Printer : This kind of printer contains a wheel, raised with letters & symbols on each petals. when the printer needs to print a character, it sends a signal to the print-head, the print-head rotates the wheel until the required character is in place, The Electro-mechanical hammer called as Solenoid, strikes the back of the petal containing the character. Then the character pushes up against the ribbon to make impression on the paper. The Speed of the printer rated at Character per second (CPS). b) Dot-Matrix printer : This kind of printer works in the same manner as Daisy-wheel printer, except that of a wheel, the print-head contains a rows of pins. These pins a fired onto the paper to form a image. The pins in the print-head are wrapped in coils of wire to create Solenoid. The printer controller sends a signal to the print-head, which forms a electromagnet, which repels the pin against the ribbon making a dot on a paper. The speed of dot-matrix printer measured in CPS. :Internal parts of the printer : 1) Power supply : 2) Logic Board : controls the function of the printer. it contains the following components ; a. CPU : It controls the data flow between the PC & the Printer. b. Master ROM : THis IC contains the instruction for the self-test & general information. c. RAM : It is used as temporary buffer for receiving data from the PC. d. pin firing circuit : This controls the firing of the pins present in the print-head. 3) SENSORS : categorize into : a. Home position sensor : This sensor is responsible to pull the print-head from its resting position, when the printer is switched on. b. Paper sensor : This sensor is used to find whether paper fed or not, when the printer runs out of paper, this sensor stops further print jobs. c. paper feed sensor : This sensor is used to detect whether paper is fed through the tractor or not. 4) control Panel : Is responsible for setting print quality, style, size. : NON-IMPACT PRINTERS (Ink jet, Deskjet,Laser) : Impact printer : In this type of printer, there is no physical contact with the paper. Inkjet Printer : In this Printer cartridges is responsible to print the image on to the paper,

It ejects the ink through the small micro-scopic nozzle. The clarity of the image is measured in terms of DPI.More the dots per inch sharper the image. Working of Inkjet Printer : This printer contains a moving print head on which an ink cartridge is attached. Inside the Ink-cartridge small chambers are present, which contains the ink-tube to supply the ink. At the front-side metal plate is attached to spray the ink on the paper. An electrical signal sent to the metal plate, the plate gets heated and cause the ink to vaporize, as this turns the ink to bulges and forms the bubble, & the bubble breakoff into droplet. LASER PRINTER : USES a technology called electrophotography (EP). Here no concept of moving of print-heads. The Electrophotography process is called Image Formation System, To print the images onto the paper it uses Photo-sensitive drum. The printing speed measures in Pages Per Minute (PPM).

Random Access Memory (RAM) The primary function of RAM is to provide a temporary storage place for information about devices and applications.

Types of RAM SRAM Static RAM (SRAM) was the first type of RAM available. SRAM can be accessed at approximately 10 nanoseconds (ns), meaning that it takes about 10ns for the processor to receive requested information from SRAM. The structure of SRAM chips limits them to a maximum data capacity of 256KB. Although SRAM is very fast compared with DRAM, it is also very expensive. For this reason, SRAM is typically used only for system cache.

DRAM Dynamic RAM (DRAM) . DRAM chips provide much slower access than SRAM chips but can store several megabytes of data on a single chip (or hundreds of megabytes if they are packaged together on a module). Every “cell” in a DRAM chip contains one transistor and one capacitor to store a single bit of information. This design makes it necessary for the DRAM chip to receive a constant power refresh from the computer to prevent the capacitors from losing their charge. This constant refresh can make access even slower and causes the DRAM chip to draw more power from the computer than an SRAM chip. Because of its low cost and high capacity, DRAM is used as “main” memory in the computer.

EDO RAM Extended data out (EDO) RAM : • • •

Uses SIMM Memory Bank of 72 pins . Communication speed used 33 Mhz Capacity is from 1MB to 16 MB

DRAM Dynamic RAM : • • •

Uses DIMM Memory Bank of 168 pins. Communication speed 66 Mhz to 133 Mhz Capacity is from 16 MB to 512 MB.

DDR (Double Data Rate) RAM : • • • •

uses DIMM Memory Bank of 184 pins. Communication speed 200 Mhz to 800 Mhz Capacity is from 64 MB to 512 MB Parallel data architecture used.

RD RAM (Rambus Dynamic Ram) : • • • •

Uses RIMM Memory Bank of 184 pins. Communication speed 400 Mhz to 800 Mhz Capacity is from 128 MB to 512 MB Serial data architecture is uses.

VRAM Video RAM (VRAM) is a specialized type of memory that is used only with video adapters. The video adapter is one of the computer’s busiest components, so to keep up with video requirements, many adapters have an on-board micro-processor and special video RAM. The adapter can process requests independently of the CPU, then store its results in the VRAM until the CPU retrieves it. VRAM is much faster than EDO RAM and is capable of being read from and written to at the same time. The result is better and faster video performance. Because VRAM includes more circuitry than regular DRAM, VRAM modules are slightly larger. Faster versions of video memory have been introduced, i,e WRAM.

WRAM Window RAM (WRAM) is another type of video RAM but it provides faster access than VRAM. It uses the same dual-ported technology that allows devices to read and write data to the video memory at the same time. The term “window” refers to its ability to retrieve large blocks (windows) of data at one time.

: MEMORY BANK : Single Inline Memory Modules The first memory chips were dual inline package (DIP) chips, which were inserted directly onto the motherboard . SIMMs are available in 30-pin and 72-pin forms. Thirty-pin SIMMs are 8-bit, meaning that data can be transferred into or out of the module 8 bits at a time. Seventy-two-pin SIMMs are 32-bit. Because SIMMs are older technology, they are typically used for fastpaged and EDO RAM.

Dual Inline Memory Modules Dual Inline Memory Modules (DIMM) modules look similar to SIMMs but are longer and are installed into a different type of slot. DIMMs have two rows of connectors 168 connectors in all, and are 64 bits.

Rambus Inline Memory Module

The Rambus Inline Memory Module (RIMM) is designed specifically for use with Rambus memory. RIMMs look just like DIMMs but have 184 connectors. They are also more proprietary and less common than SIMMs and DIMMs. RIMMs are 16-bit.

Small Outline DIMM small Outline DIMM (SoDIMM) is a memory module frequently used in laptop computers. The physical size is much smaller than DIMM memory. The most common pin configurations are 72- and 144-pin modules.

: CPU Chips : The Intel 8086 (released in 1978) to the currently popular Intel Pentium III, Pentium 4, Pentium D.

Pentium (586) The Intel Pentium processor was first released in March 1993. It was the first

Pentium (586)

The Intel Pentium processor was first released in March 1993. It was the first superscalar processor, meaning that it was capable of parallel processing and that two sets of instructions could be processed at the same time. Pentium processors support speeds of 60, 66, 75, 90, 100, 120, 133, 150, 166, and 200MHz. Pentiums 60 and 66 have a 273-pin PGA design and fit into socket 4 on the motherboard. These earlier processors contained about 3.1 million transistors and used 5vDC. Pentiums 75–200 are 296-pin staggered PGAs that use Socket 7. The Pentium 75–133MHz processors have 3.2 million transistors, and Pentium 150–200MHz processors have 3.3 million transistors. All Pentiums over 66MHz use 3.3vDC and can use either a passive heat sink or a fan (an active heat sink).

Pentium Pro The Pentium Pro processor was released in November 1995 and was designed for use on servers rather than regular desktops. The Pentium Pro supports speeds of 150, 166, 180, and 200MHz. Its form is a 387-pin PGA, and it uses Socket 8 on the motherboard. The Pentium Pro contains approximately 5.5 million transistors and uses 3.3vDC (3.1 for the 150MHz). Due to the increased number of transistors, Pentium Pro chips require an on-board fan—they generate too much heat to use a passive heat sink.

Pentium with MMX Technology In January 1997, Intel released a processor similar to the Pentium but with an improved instruction set called multimedia xtensions (MMX) for handling graphics and other multimedia. All Pentium family processors released since this Pentium include the MMX instruction set. The Pentium with MMX supports 166, 200, and 233MHz speeds and uses the same 296-pin staggered PGA form as a regular Pentium. It also uses 3.3vDC externally, but because it uses only 2.8vDC internally, uses a special Socket 7 that supplies the appropriate voltage. This processor contains 4.5 million transistors and can use either a passive heat sink or a fan.

Pentium II The Pentium II processor, released in May 1997. The Pentium II includes 512KB of on-board L2 cache, so the form was changed from the PGA to the much larger single-edge contact (SEC). SEC processors (242 pins) are attached to the motherboard via a Slot 1 connector. The Pentium II introduced a number of new characteristics, such as its support for speeds of 233, 266, 300, and 333MHz. It contains

approximately 7.5 million transistors, so it must use a special cooling fan. It uses 3.3vDC and includes 32KB of L1 cache.

Pentium III

The Pentium III (PIII) processor was released in March 1999. It includes advanced multimedia instructions, called single-instruction multiple data (SIMD) technology. Its first variant, referred to as simply Pentium III, has 512KB in on-board L2 cache and uses a 100MHz system bus. The PIII processor uses 256KB of on-board advanced transfer cache (ATC). ATC is a new technology that can increase performance by about 25 percent by including L2 cache in the processor. ATC runs at the processor speed and improves overall cache performance. Pentium III processors range in speeds from 450MHz to 1.13GHz and can include. 370-pin PGA ZIF (zero insertion force). Pentium III processors contain 9.3 million transistors and have integrated fans.

Pentium 4 The Pentium 4 (P4) processor was released in 2000. It includes all of the features of the Pentium III plus a few more. The chip went through a redesign that includes a new architecture called the NetBurst microarchitecture. Where older Pentiums pretty much topped out at 1GHz, the P4 is designed to work at much faster speeds that allow it to exceed speeds of 2GHz on the desktop. The Pentium 4 uses the Socket 478.

AMD K5 Also released in 1995 was the K5 processor, designed by Advanced Micro Devices (AMD). This processor supports speeds of 75, 90, 100, and 116MHz, contains 4.3 million transistors, and uses 3.52vDC. The K5 processor has a 296-pin PGA design and uses Socket 7. It also requires an active heat sink (fan). Like the Pentium, the K5 has a 64-bit data bus, a 32-bit register, and a 32-bit address bus. The main difference between the Pentium and K5, other than the supported speeds, is the use of L1 cache. The Pentium supports up to 512KB the K5 supports only 8KB.

AMD K6 Around the time of the Pentium II processor’s release, AMD released its own sixth-generation processor, the K6. This processor supports speeds from 166–266MHz.It has around 8.8 million transistors and uses 3.3vDC. Like previous AMD processors, the K6 is a 296-pin PGA and uses Socket 7 to attach to the motherboard. As with most processors, the K6 has a 64-bit data bus, a 32-bit register, and a 32-bit address bus. It also includes between 256KB and 1MB of L1 cache, but it does not include an on-board L2 cache.

AMD Duron and Athlon AMD released the Duron processor in 1999. The Athlon was released in 2000. The Duron supports speeds between 700 and 800MHz; the Athlon gives the PIII a run with support for 850MHz–1.2GHz and 128KB of L1 cache.

Cyrix MII Also released in 1997 was the Cyrix MII processor, which supports speeds of 150, 166, or 187MHz. It contains 6 million transistors, uses 3.3vDC, and has a 296-pin PGA form. Although its data bus, register, and address bus match that of the K6, the MIIcontains only 64KB of L1 cache. : IMP-Points :

BIOS Basic Input Output System. A standard set of instructions or programs that handle boot operations. When an application needs to perform an I/O operation on a computer, the operating system makes the request to the system BIOS, which in turn translates the request into the appropriate instruction set used by the hardware device. BOOT.INI The startup file that allows for selection of the operating system to be booted in Windows NT 4 through Windows XP. Bus The pathway that transmits electronic signals from one computer device to another. CMOS Complementary Metal-Oxide Semiconductor. An integrated circuit composed of a metal oxide that is located directly on the system board. The CMOS,which is similar to RAM in that data can be written to the chip, enables a computer to store essential operating parameters after the computer has been turned off,enabling a faster system boot. DB-9 A type of connector that uses nine wires for connections. Most commonly used for serial port connections. DB-25 A type of connector that uses 25 wires for connection. Most commonly used for parallel communications or older serial communications. DDR Double Data Rate. A type of memory technology used to effectively double the data rate of SDRAM memory. Device Driver Programs that translate necessary information between the operating system and the specific peripheral device for which they are configured,such as a printer. FDISK.EXE A DOS-based utility program that partitions a hard disk in preparation for installing an operating system. File System The process or method that an operating system uses to manage files and data on the storage devices. IRQ Interrupt Request. The physical lines over which system components such as modems or printers communicate directly with the CPU when the device is ready to send or receive data. OS Operating system. A set of computer instruction codes, compiled into executable files, whose purpose is to define input and output devices and connections and provide instructions for the computer's central processor unit (CPU) to operate on to retrieve and display data.