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Reverse Polish notation
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===={{anchor|Two-level RPN}}Commodore==== In 1974, [[Commodore Business Machines|Commodore]] produced the [[Commodore MM6|Minuteman *6]] (MM6) without an {{key press|Enter {{larger|β}}}} key and the [[Commodore MM6X|Minuteman *6X]] (MM6X) with an {{key press|Enter {{larger|β}}}} key, both implementing a form of ''two-level RPN''. The [[Commodore SR4921 RPN|SR4921 RPN]]<!-- not to be confused with the SR4921 without the RPN suffix! --> came with a variant of ''four-level RPN'' with stack levels named X, Y, Z, and W (rather than T) and an {{key press|Ent}} key (for "entry"). In contrast to Hewlett-Packard's reverse Polish notation implementation, W filled with 0 instead of its contents being duplicated on stack drops.<ref name="Commodore_SR4921R"/>
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