what format do I use to unpack (3,0)?

It depends upon what DEF FIXED(3,0) means; and that depends upon the language (programming or specification) that is being used and which you haven't identified.

It doesn't correspond to (my memory of) COBOL nor any variant of SQL I am familiar with.

Unless you can identify what programming or data definition language the specification is written in, you are not going to get anything more than guesses.

Is the document from which you drew the spec publicly linked?

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In reply to Re: unpack parameter by BrowserUk
in thread unpack parameter by Anonymous Monk

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