In-Depth Notes on Computer Organisation and System Design

System Architecture

• CPU: The brain of the computer responsible for instruction processing.

  • ALU: Performs arithmetic and logical operations.

  • CU: Manages instruction execution.

  • Registers: High-speed storage for temporary data.

Primary Memory

• Definition: Fast, temporary storage for the CPU.

• Types:

  • RAM: Volatile memory for active data.

  • ROM: Non-volatile for essential system instructions.

Cache Memory

• Purpose: High-speed storage in CPU for frequently used data.

Machine Instruction Cycle

• Comprises fetching, decoding, and executing instructions.

Secondary Memory

• Persistent Storage: Long-term storage, slower than primary memory.

• Types:

  • Magnetic: e.g., Hard Disk Drives.

  • Optical: e.g., CDs, DVDs.

Operating Systems

• Functions: Manage resources, provide user interfaces, and run applications.

Application Software

• Designed for specific tasks with GUIs, APIs, and data management features.

Binary Representation

• Terms:

  • Bit: Smallest data unit (0 or 1).

  • Byte: 8 bits.

  • Binary: Base 2 system in computing.

  • Denary: Base 10, user-friendly format.

  • Hexadecimal: Base 16, used in programming.

Logic Gates

• Boolean Operators: AND, OR, NOT, NAND, NOR, XOR are key to digital circuits, described via truth tables and logic diagrams.