Suppose you have a 32-bit instruction with the following format: If there are 60

Question

Suppose you have a 32-bit instruction with the following format: If there are 60 opcodes and 32 registers, what is the range of values that can be represented by the immediate (IMM) ? Assume IMM is a 2's complement value? What is the largest positive number we can represent literally (i.e., as an immediate value) within an LC-3 ADD instruction? Suppose we have 8 machines that we want to monitor with respect to their availability and busyness. We use an 8-bit vector to keep track of their availability and busyness. Assume this bit vector is stored in R2, we can use the LC-3 instruction 0101 011 010 1 00001 (ADD R3, R2, #1) to determine whether machine 0 is busy or not. If the result of this instruction is 0, then the machine 0 is busy. Write an LC-3 instruction that determines whether machine 2 is busy. Write an LC-3 instruction that determines whether both machines 2 and 3 are busy. Write an LC-3 instruction that indicates none of the machines are busy. Can you write an LC-3 instruction that determines whether machine 6 is are busy? Explain. TheLC-3 does not have the instruction for performing the logical function OR. However, we can write a sequence of instructions to perform the OR operation. The four instructions below performs the OR of R1 and R2 and store the result in R3. Complete the two missing instructions so that the four instruction sequence performs the OR. 1001 1000 0111 1111 0101 1101 00000101 State the contents of R1, R2, R3, and R4 after the program starting at location times 3100 halts.

Explanation / Answer

5 bits in the immediate value for an LC-3 ADD, but the first bit is needed for the sign representation. The answer is 15

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