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Stack pointer

<architecture, programming> (SP) A register or variable pointing to the top of a stack.

If the stack is a "full" stack the SP points to the most recently pushed item, else if it is an "empty" stack, the PS points to the first empty location, where the next item will be pushed.

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Stack Environment Control Dump machine stack frame stacking order stack loader stack overflow	6502 65816 Advanced RISC Machine AMD 29000 context switch	stack puke stack traceback STAGE2 Staggered Pin Grid Array staircase