Operand Addressing Modes

techi3

In Runtime
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I am taking a test soon and I am having trouble finding a good way to distinguish the difference between Pre-indexed and Post-indexed operand addressing modes. Specifically for the ARM - Advanced (RISC) Machine. I know at one point the post-indexed has an offset added or subtraced to it from the base register value but from there they both seem to run together. Google is not being my friend, I need a SME. Thank you.:confused:
 
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