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*Concepts you may want to Google beforehand: stack*
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**Goal: Learn how to use the stack**
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The usage of the stack is important, so we'll write yet another boot sector
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with an example.
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Remember that the `bp` register stores the base address (i.e. bottom) of the stack,
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and `sp` stores the top, and that the stack grows downwards from `bp` (i.e. `sp` gets
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decremented)
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This lesson is quite straightforward, so jump ahead to the code.
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I suggest that you try accessing in-stack memory addresses by yourself,
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at different points in the code, and see what happens.
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