The Tech Leaf

What is Computer? A Computer is an electronic device that stores, retrieves and process data or which manipulates data according to a list of instructions and which is composed of hardware and software. Therefore it used for surfing, typing, programming, playing games, etc,. It is a hardware machine and storing of data and displaying information with the help of programmable language using operating systems software. However it uses a windows operating system software to provide a graphical user interface. After that the windows Operating systems which uses windows 7, windows 8 and windows 10. In other words operating system is interface between the user and hardware. A computer is a sequence of logical operations through a programming languages. A control unit systems used as a industries and other devices like mobile phones such as smart phones. A central processing unit is used to performs a logical operations and the peripheral devices are used such as input devices and output devi

What is CMOS? CMOS stands for Complimentary Metal Oxide Semi-Conductor and it stores roughly 64Kb of data. It is the part of the southbridge in most computers. The specification stored in Complimentary Metal Oxide Semi-Conductor must match hardware and it allows you to access the BIOS. When hardware is change or update, Complimentary Metal Oxide Semi-Conductor must be updated. CMOS Battery Accessing BIOS through CMOS setup Complimentary Metal Oxide Semi-Conductor can only be accessed when the PC is booting and key combination at start-up. The changes are stores on an NVRAM Complimentary Metal Oxide Semi-Conductor chip. The mouse doesn’t work in Complimentary Metal Oxide Semi-Conductor setup. AMI and AWARD BIOS – DEL key  PHOENIX BIOS – CTRL, ALT and ESC keys or F2        CMOS Chip Complimentary Metal Oxide Semi-Conductor is stored in an SRAM chip called Non-Volatile Random Access Memory (NVRAM). It stores data that is uses by the BIOS and NVRAM is powered by Complimentary Metal Oxide S

CD-ROM Drive Components A CD-ROM Drive is the commonly used optical storage devices compact disks drive and the components contains a equipment from front view, back view, top view and bottom view portions. The Compact Disk Read Only Memory it contains data were computers can read but not write or erase in CD-ROM it is a type of read-only memory. In the 1990's CD-ROM was use for software and data distribution for the computer. Some CDs are use to play audio on the CD players. Therefore a disk is made up of 1.2 mm thick polycarbonate plastic with a thin layer of aluminum to make a reflective surface. The common size of CD-ROM is 120 mm in diameter and the smaller Mini CD standard size is 80 mm in diameter. The following CD-ROM Drive Components are given below. Optical "Head" Assembly  Spindle Motor, Constant Linear Velocity (CLV) and Constant Angular Velocity (CAV)  Connectors and Jumpers  Logic Board  Audio Output and Controls Front View Headphone Jack  Manual Eject  Tray

What is BIOS?  A BIOS stands for “Basic Input Output System”, is a chip on the motherboard. It is stored in the computers and it is a ROM (Read Only Memory) chip and EPROM (Electronically Erasable Programmable Read-Only Memory) is also known as firmware. It will support all hardware on a 286 AT PC and drivers are required for all other hardware. The original version is 8088 BIOS. BIOS Functions of BIOS  It stores a set of instructions to tell the PC how to control devices and provides low-level hardware access. It tests hardware on startup using POST and runs “bootstrap loader” after POST. After this, the operating system takes over. The BIOS sit between the hardware and the operating system BIOS Location Four Stage Model of Computing Model of Computing   Startup Routine POST  Bootstrap Loader  Master Boot Record IO.SYS  NTLDR  1. During the POST, the BIOS tells drivers to “test themselves” and report back. The problems are flagged either by beeps codes or by messages on the screen.  e