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- Parameter Stack
-
- DROP a --
- DUP a -- a a
- OVER a b -- a b a
- ROT a b c -- b c a
- SWAP a b -- b a
- 2DROP a a --
- 2DUP a b -- a b a b
- 2OVER a b c d -- a b c d a b
- 2SWAP a b c d -- c d a b
- 'S Returns current stack pointer, not counting the
- push it's making right now.
- S0 Returns address of PSP TOS. When PSP is empty,
- 'S == S0
- (cont.)
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