Intro to computers Hardware Operating System, Communication Computers PowerHardware Software OS Application COMMUNICATION.

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Presentation transcript:

Intro to computers Hardware Operating System, Communication Computers PowerHardware Software OS Application COMMUNICATION

Hardware Components of a desktop computer. Power Supply - An electrical transformer regulates the electricity used by the computer. Central processing unit (CPU) - The microprocessor "brain" of the computer system. Memory - RAM - Used to temporarily store information that the computer is currently working with or ROM - A permanent type of memory storage used by the computer for important data that does not change Motherboard (aka; Mainboard) This is the main circuit board that all of the other internal components connect to. Hard Disk (fixed) - permanent storage Removable Storage (floppy, CDROM, DVD, Zip, JAZZ, MicroCards) Graphics Card - translates image data to human format (monitor display)

Computer POST Cycle BIOSVIDEO COLD YES System Check Display Info NO BOOT Load OS

OS Manage Resources Consistent Application Interface Basic software that allows the user to interface with the computer. Real-time operating system Single-user, single task Single-user, multi-tasking Multi-user Categories Processor management Memory management Device management Storage management Application interface User interface Tasks

Processor management The heart of managing the processor comes down to two related issues: Ensuring that each process and application receives enough of the processor's time to function properly and Using as many processor cycles for real work as is possible Memory & Storage management enough memory to execute, and it MUST NOT run into the memory space of another process or run into by another process. The different types of memory must be effectively used. OS Details

OS Details (cont.) Device management The operating system and virtually all hardware (not on the computer's motherboard) uses a a special program called a DRIVER. Application interface (App/OS & App/User) Application Program Interfaces (APIs) let programmers use functions of the computer and operating system without having to directly track all the details CPU's operation. Just as the API provides a consistent way for applications to use the resources of the computer system, a user interface (UI) brings structure to the interaction between a user and the computer

Communication Hierarchy & Structure Switching vs. Digital Devices Node (computer in our case) – NIC – Cable – Switch – Cable – Router. Node – NIC- Access Point (wireless) – Cable – Amplifier – Tower – Satellite Node (Cell Phone) – Tower – Cable – Tower / Satellite Protocol (TCP/IP ) IP Address DNS Servers Web Servers