Quiz 3 Review

Pseudo ops question: What does the .fill pseudo op do?

• It reserves a block of memory without initializing it.

• It fills memory with a specified value at a memory location.

• It copies the contents of one register into another.

• It marks the end of a program or subroutine.

Rick doesn't get the 1st pass of assembly. What does the symbol table look like after its first pass?

• 
• 
• 
• 

Which instruction should you use to load a specific value into a register, given the value is at a memory address held by a label?

• LEA

• LD

• LDR

• LDI

Use the following LC-3 code. Which instruction should be used to get a specific value into a register?

• LEA R1, PTR

• LD R1, PTR

• LDR R1, PTR

• LDI R1, PTR

What will the value in R1 be in decimal?

• 8

• 16

• 42

• Undefined

Bianca wrote .stringz in LC3 assembly but she doesn't really get how it works. How are strings stored in memory in LC-3 assembly language?

• As a sequence of ASCII characters ending with a zero (null) terminator.

• As a single word that contains the entire text.

• As binary numbers corresponding to each character’s memory address.

• As characters stored in reverse order to optimize access speed.

What does R1 hold in decimal after this program runs?

• 64

• 16

• 32

• 128

What is the value of R0 after the code executes?

• 1

• 0

• Undefined

• 36

If R2 contained -3 before execution, which statement is true when the BRp TARGET instruction executes?

• The branch will not be taken because R3 was loaded from memory.

• The branch will not be taken because the last instruction that set condition codes produced a non-positive result.

• The branch will be taken because the store instructions doesn’t set condition codes.

• The branch will always be taken since BRp doesn’t depend on condition codes.

What will the decimal value in R1 be after this program runs?

• 12

• 1

• 9

• 19