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Overview of EMU 8086 Microprocessor Emulator

Aug 11, 2024

Notes on EMU 8086 Microprocessor Emulator Presentation

Overview

  • Introduction to EMU 8086 microprocessor emulator.
  • Simple demonstration of its functions and coding process.
  • Explanation of the need for using this emulator.

Emulator Interface

  • Upon opening EMU 8086, the logo is displayed.
  • New project options:
    • Select ‘Empty Workspace’ for coding.
  • Workspace includes:
    • File options (save, open, etc.)
    • Built-in calculator for conversions (decimal, octal, binary, etc.).
    • ASCII code reference for characters.

Design of EMU 8086

  • EMU 8086 replicates the functions of the physical 8086 microprocessor.
  • Physical 8086 microprocessor kit contains buttons (0-9), offset value settings, and code execution options (opcodes).
  • Transition from physical to virtual coding is facilitated by technology advancements.

Example Code: Addition using EMU 8086

  1. Setting up Registers:
    • Use MOV command to assign values to registers:
      • MOV AX, 0001H (AX = Accumulator Register)
      • MOV BX, 0002H (BX = Base Register)
  2. Performing Addition:
    • ADD BX, AX (BX will now contain AX + BX value)
    • Result: BX = 0003H
  3. Execution:
    • Use 'Single Step' to execute the code line by line.
    • AX and BX values will be displayed after each step.

Registers and Their Functions

  • AX: Accumulator Register.
  • BX: Base Register.
  • It’s crucial to understand 8086 architecture and register functions before coding.

Flags in 8086 Architecture

  • Flags indicate the status of the arithmetic operations:
    • Carry Flag (CF): Indicates carry in addition/subtraction operations.
    • Zero Flag (ZF): Indicates if the result is zero.
    • Sign Flag (SF): Indicates the sign of the result.
    • Overflow Flag (OF): Indicates overflow in arithmetic operations.
  • Control Flags: Include Trap Flag, Direction Flag, and Interrupt Flag.

Essential Knowledge Areas

  • Understand 8086 register architecture (AX, BX, CX, DX).
  • Familiarity with flags and their functions is important for exams.
  • Knowledge of instructions, pipelining, instruction queue, and address conversion is necessary.

Future Topics

  • Subsequent videos will cover:
    • Looping using CX register.
    • Additional examples including carry flags and more.
  • Encouragement to subscribe for more programming tutorials (C, C++, Blender, Unity).

Conclusion

  • Thanks for watching and support the channel for more content.

Full transcript