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STACK MANIPULATION
These are abbreviated details from the section WORD
LIST, grouped here for convenience.
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-DUP
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( 0 - 0 ) or ( n1 - n1 n1 )
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-ROT
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( n1 n2 n3 - n3 n1 n2 )
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.S
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( - )
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Non-destructive display
of stack
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2>R
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( n1 n2 - )
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Moves two nos. from stack to return stack
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2DROP
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( n1 n2 - )
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2DUP
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( n1 n2 -
n1 n2 n1 n2 )
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2OVER
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( d1 d2 -
d1 d2 d1 )
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2R
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( - n1 n2 )
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Copies two nos. from return stack to stack
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2R>
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( - n1 n2 )
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Moves two nos. from return stack to stack
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2ROT
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( d1 d2 d3
- d2 d3 d1 )
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2SWAP
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( n1 n2 n3
n4 - n3 n4 n1 n2)
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><
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( n1 - n2 )
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n2 is n1 with its bytes swapped
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>R
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( n - )
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Moves number from stack to return stack
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DROP
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( n - )
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DUP
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( n - n n )
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I
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( - n)
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n is a copy of the current loop index
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J
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( - n)
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Copies third number on the return stack to stack. Usually
used in the inner of two nested DO loops to access the index of the
outer loop.
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NIP
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( n1 n2 -
n2 )
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OVER
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( n1 n2 -
n1 n2 n1 )
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PICK
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( N - n )
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Take the Nth item on the stack (not including N) and
place it on top of the stack.
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2R
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( - n1 n2 )
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Copies two numbers from return stack to stack
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R
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( - n )
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Copies number from return stack to stack
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R>
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( - n )
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Moves number from return stack to stack
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ROLL
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( n - )
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Copies nth item on stack to the top
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ROT
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( n1 n2 n3
- n2 n3 n1 )
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RP!
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( - )
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Clear return stack
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R0
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( - addr)
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User variable containing initial location of return stack
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S0
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( - addr)
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User variable containing initial location of stack
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SP!
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( - )
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Clear stack
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SP@
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( - addr )
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Address of the uppermost
byte of top item on the stack before SP@ was executed
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SWAP
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( n1 n2 -
n2 n1 )
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