Understanding File Subsystems and Disk Access

Posted by on Mar 16, 2025 in Computers | 0 comments

File Subsystem and Disk Access

The file subsystem is a part of the operating system responsible for ensuring each user has access to their files and programs and for ensuring the safety of these files by controlling access by other users.

  • Field: A set of interrelated characters. Types: numeric, alphanumeric, Boolean, etc.
  • Record: A set of fields relating to the same entity.
  • File: A set of interrelated records.
  • Database: Interrelated groups of files that are managed together.
  • Key: A set of one or more
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Operating Systems: Elements, Structure, and Functions

Posted by on Mar 16, 2025 in Computers | 0 comments

Unit 2: Operating System Elements and Structure

2.1 Introduction to the OS

OS Definition: A set of programs, services, and functions that manage and coordinate the operation of hardware and software.

User Interaction: Through an Interface

  • Interface Types:
    • Text mode (Prompt)
    • Graphic Mode (Mouse, Touchscreen, Voice)

Types of OS (Based on Hardware and Software Management):

  • Single-User OS: Only one simultaneous user (e.g., XP, Vista, MS-DOS).
  • Multi-User OS: Multiple users can use software and hardware resources
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Visual Basic: Relational Operators, Loops, and Control Lists

Posted by on Mar 15, 2025 in Computers | 0 comments

Relational Operators in Visual Basic

Relational operators are used to compare values in Visual Basic. Here’s a breakdown of common operators:

  • = (Equals): The expression a = b evaluates to True if a is equal to b, and False otherwise.
  • > (Greater Than): The expression a > b evaluates to True if a is greater than b, and False otherwise.
  • < (Less Than): The expression a < b evaluates to True if a is less than b, and False otherwise.
  • >= (Greater Than or Equal To): The expression a >= b evaluates
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8086 Microprocessor: Instruction Formats and Assembler Directives

Posted by on Mar 15, 2025 in Computers | 0 comments

8086 Instruction Formats

A machine language instruction format has one or more fields associated with it.

  • The first field is called the operation code field or opcode field, which indicates the type of operation to be performed by the CPU.
  • The instruction format also contains other fields known as operand fields.
  • The CPU executes the instruction using the information which resides in these fields.
  • There are six general formats of instructions in the 8086 instruction set.
  • The length of an instruction may
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Information Systems: Concepts and Applications

Posted by on Mar 15, 2025 in Computers | 0 comments

Module 1: Information Systems in Business

  • Computer literacy is the skill in using productivity software, such as word processors, spreadsheets, database management systems, and presentation software, as well as having a basic knowledge of hardware and software, the Internet, and collaboration tools and technologies.

  • Information literacy is understanding the role of information in generating and using business intelligence.

  • Business intelligence (BI) provides historical, current, and predictive views

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Understanding Programs, Software, and Systems

Posted by on Mar 14, 2025 in Computers | 0 comments

A program is a set of instructions written in a programming language for a computer to perform a particular task. A program is called into action to create or design programs. Programmers are the people who carry out this action.

Programming Languages

Low-Level Language

Used to write programs or system software because they provide a more direct shape.

High-Level Language

Used to write application programs and special-purpose programs, written in a way more like the language we speak, but in English.

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