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4 cards from this section. Quick, good the night before a test.
Define the term 'Program Counter'.
What does the PC hold?
What is the difference between immediate and direct addressing modes?
Think about where the operand is located.
What is the role of the Program Counter in instruction fetching?
Think about what keeps track of instruction order.
In which addressing mode is the operand included directly in the instruction?
What means that the operand is 'immediate'?
Given an instruction fetch sequence involving both direct and indirect addressing modes, detail what could happen if a memory address is incorrect.
Think about what happens in a real-life scenario when you try to find something that isn't there.
Design an instruction sequence that effectively combines immediate and direct addressing modes to compute a simple arithmetic operation. Show how control signals would differ.
Visualize how the computer might prioritize fetching from memory vs. using an immediate value.
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