If register A contained the pattern 00000000, which of the following instructions could alter the contents of register 0? (Refer to the language description table.)
A) 700A
B) 800A
C) 900A

Question

Quizplus · Accepted Answer

Option A (700A) is an unconditional jump instruction, which does not modify any register.
Option B (800A) is the move immediate data instruction, which would transfer the value 0x0A to register 0, thereby altering its contents.
Option C (900A) is a branch if not zero instruction, which would examine the contents of register 0, and jump to the instruction at address 0x0A if it does not contain 0x00. It does not modify any registers in the process.

If Register a Contained the Pattern 00000000, Which of the Following