#9 Assembly Language

1. Which of these describes the structure of an assembly language statement?

• A. An opcode then any operands
• B. A binary instruction followed by a binary number
• C. An instruction set
• D. A list of operands

2. What is the connection between code in high-level language and its corresponding assembly language representation?

• A. There is a direct one-to-one correspondence between the number of lines of assembly code and high-level code
• B. Assembly language statements are merely high-level statements rewritten using mnemonics so they will always contain the same number of lines of code
• C. One line of code in assembly language usually corresponds to several lines of high-level code
• D. One line of high-level code usually translates into several lines of code in assembly language

3. What is meant by the instruction set of a CPU?

• A. It is the syntax rules of the high-level language used to program on that CPU
• B. The instruction set is the set of all instructions that form the language and it is unique to a particular type of processor
• C. It is a list of all of the operands that can be used when writing an assembly language program
• D. It is the set of special-purpose and general-purpose registers used during program execution

4. What is the accumulator?

• A. A register
• B. An input device
• C. A variable that holds memory addresses and data values
• D. A special command in LMC

5. When programming using a Little Man Computer (LMC), which of the following is not part of an LMC instruction?

• A. Label
• B. Semicolon
• C. Mnemonic
• D. Data

6. What is meant by BRZ in Little Man Computer programming?

• A. Perform a branch once the accumulator gets to zero
• B. Perform a branch once the user enters zero
• C. Perform a branch if the accumulator is currently zero
• D. Perform a branch if the accumulator is currently zero or below

7. When programming using a Little Man Computer (LMC), where do inputs go once they have been read in?

• A. They go to general-purpose register r1
• B. They go directly to the accumulator
• C. They go directly to memory
• D. They get held in a buffer zone

8. When adding using a Little Man Computer (LMC), e.g. ADD x, what is the x added to?

• A. Zero
• B. The value held at memory location 0
• C. Itself
• D. The contents of the accumulator

9. What is the purpose of a label when performing iteration in a Little Man Computer (LMC) program?

• A. It indicates only where a loop begins
• B. It indicates what type of loop it is: WHILE, FOR or REPEAT-UNTIL
• C. It is a commenting technique
• D. It allows the sequence of instructions to jump ahead and jump back so as to allow repeated execution of certain

10. Explain the meaning of LDA in a Little Man Computer (LMC) program.

• A. It resets the accumulator to zero
• B. This is a load instruction which retrieves a data value from a specified memory location
• C. It checks whether the value in the accumulator is less than the data value in memory
• D. It lowers the denary value of the accumulator by 1