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p_rbpn.adoc
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// stack.asm: WORD p_rbpn, 'R[n]',fasm
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anchor:p_rbpn[]
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=== Word: R[n]
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....
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Data stack: ( n -- a )
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....
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"R[n]" is a function word that pushes the address for the n:th cell of
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the return stack onto the data stack.
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====
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.Defintion concept for R[n]
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****
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( n -- a ) : R[n] 8 * RSP + ;
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****
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====