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Yes, it's the right thread — read the initial question, skim through the other responses on that page, and then go to the next page to read MJD's excellent response at number 11.
The questioner could also get direct access to BCD with PL/1, the original Swiss Army Chainsaw [plover.com], which brings us back to MJD.
The questioner couldn't see the forest for the trees BCD only saves him 50% memory compared to Tiny (byte) integers or array of chars. (Or Tiny costs only 100%.) Which in big-oh notation is
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