. All of them can be checked at the same time if you don't know how the data is used, but are sure it's used somehow. Note that if it's the value to an assembly instruction, it won't cause a break, because the byte itself isn't the start of an instruction, and isn't read by the CPU so much as used for an instruction.</p>
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<p>The Option boxes CPU Mem, PPU Mem, and Sprite Mem tell the debugger where to look. The Hex Viewer will show you CPU Mem by default, and PPU Mem if you tell it to. PPU Mem i