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IP (Instruction Pointer)
Pointer to the current instruction being executed
It is not directly affected by OR
Can be used as a segment selector, only top half is used for this purpose
SP (Stack Pointer)
Pointer to the bottom of the stack (grows down) (used implicitly by push/pop instructions)
BP (Base Pointer)
Pointer to the top of the stack (grows down) (used implicitly by push/pop instructions)
TODO: define n
SS0 to SS<n> (Segment Selector n)
Half-width registers used for addressing purposes
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