Intel IAPX88 Architecture Quiz
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Questions and Answers

What is the bit size of the accumulator and registers in the 8088 processor?

  • 16 bits (correct)
  • 8 bits
  • 64 bits
  • 32 bits

    • What is the main reason for choosing the Intel iAPX88 architecture for discussion?

  • Its wide availability and free assemblers and debuggers (correct)
  • Its simplicity and ease of use
  • Its high processing power
  • Its advanced features and functionalities

    • What is the significance of the iAPX386 processor in the context of this course?

  • It is not used in the course due to its complexity
  • It is the primary processor used in the course
  • It is used in the second half of the course due to its advanced features (correct)
  • It is used only for specific instructions

    • What is the term for the organization and functionalities of the registers in a processor?

    <p>Register Architecture</p> Signup and view all the answers

    What is the relationship between the instructions of the iAPX88 and iAPX386 processors?

    <p>The iAPX88 instructions are a subset of the iAPX386 instructions</p> Signup and view all the answers

    What was the bit size of the first meaningful processor released by Intel?

    <p>8 bits</p> Signup and view all the answers

    What was the significance of the 8080 processor?

    <p>It was popular due to its simplistic design and versatile architecture</p> Signup and view all the answers

    What is the term for the instructions that can be executed by a processor?

    <p>Instruction Set Architecture</p> Signup and view all the answers

    What is the primary function of the instruction pointer in a CPU?

    <p>To point to the next instruction and control the program flow</p> Signup and view all the answers

    What is the purpose of the cmp instruction in the given example?

    <p>To compare the value in register ax with 0</p> Signup and view all the answers

    What is the effect of the cli instruction on the processor?

    <p>It clears the interrupt flag</p> Signup and view all the answers

    In the context of the iAPX88 architecture, what is the significance of the 'X' in register names like 'AX', 'BX', 'CX', and 'DX'?

    <p>It represents the extended 16-bit size of these registers.</p> Signup and view all the answers

    What is the purpose of program flow control instructions?

    <p>To control the program execution and flow</p> Signup and view all the answers

    Which of the following statements accurately describes the relationship between the registers 'AH' and 'AL' in the iAPX88 architecture?

    <p>'AH' represents the high byte and 'AL' represents the low byte of the 'AX' register.</p> Signup and view all the answers

    What is the purpose of special instructions in a CPU?

    <p>To change specific processor behaviors</p> Signup and view all the answers

    What is the primary function of the 'CS' register in the iAPX88 architecture?

    <p>It holds the address of the next instruction to be executed.</p> Signup and view all the answers

    What is the purpose of the add instruction in the given example?

    <p>To add the value 0534 to register bx</p> Signup and view all the answers

    In the context of assembly language programming for the iAPX88 architecture, how are registers utilized for addressing memory locations?

    <p>Registers are used in combination with other registers or immediate values to calculate memory addresses.</p> Signup and view all the answers

    What is the function of the jne instruction in the given example?

    <p>To jump to the instruction at address 1234 if the condition is true</p> Signup and view all the answers

    Consider the following assembly language instruction: MOV AX, BX. What is the primary operation being performed by this instruction?

    <p>The content of the 'AX' register is copied to the 'BX' register.</p> Signup and view all the answers

    What is the purpose of the bracketed form of addressing in the given example?

    <p>To address data in memory at address 1200</p> Signup and view all the answers

    What is the purpose of the 'FLAGS' register in the iAPX88 architecture?

    <p>It holds the current status of the processor, including flags.</p> Signup and view all the answers

    Which of the following accurately describes the concept of a 'stack' in the context of the iAPX88 architecture?

    <p>A specialized data structure used for temporary data storage and function call management.</p> Signup and view all the answers

    Which register in the iAPX88 architecture is primarily used for managing the stack pointer?

    <p>SP</p> Signup and view all the answers

    Study Notes

    Intel IAPX88 Architecture

    • The Intel IAPX88 architecture is used in IBM PCs due to its wide availability and the presence of free assemblers and debuggers.
    • The IAPX88 stands for "Intel Advanced Processor Extensions 88" and was used in the first IBM PC machines.
    • The 8088 is a 16-bit processor with 16-bit registers, including an accumulator.
    • The 8088 is upward compatible with the iAPX386, which is a 32-bit processor.

    History of Processors

    • Intel released 4-bit processors initially, but the first meaningful processor was the 8080, an 8-bit processor.
    • The 8080 became popular due to its simplistic design and versatile architecture.
    • The 8085 was an advanced version of the 8080 and also became widely popular in the engineering community.
    • The 8088 was released as a 16-bit processor and allowed for a maximum memory of 1MB, compared to the 64KB limit of the 8085.
    • The 8088 was used in IBM PCs, which became widely successful due to their open architecture and easily available information.

    Register Architecture

    • The IAPX88 architecture consists of 14 registers.
    • The registers include general registers (AX, BX, CX, and DX), segment registers (CS, DS, ES, and SS), pointer registers (SP, BP, SI, and DI), and the instruction pointer (IP).
    • The general registers have specific functions, but can also be used as general-purpose registers.
    • Each general register can be accessed as a whole (e.g., AX) or as individual bytes (e.g., AH and AL).

    General Registers

    • The general registers can be used for arithmetic and logical operations.
    • Examples of instructions using general registers include and ax, 1234 and add bx, 0534.

    Program Control Instructions

    • The instruction pointer (IP) points to the next instruction to be executed.
    • Program control instructions can change the flow of program execution by altering the instruction pointer.
    • Examples of program control instructions include cmp ax, 0 and jne 1234.

    Special Instructions

    • Special instructions are used to change specific processor behaviors.
    • Examples of special instructions include cli and sti, which clear and set the interrupt flag, respectively.

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    Test your knowledge of the Intel IAPX88 architecture, its history, and its features. Learn about its use in IBM PCs and its compatibility with other Intel processors.

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