8 minutes ago (edited)
It has been 25 years since I wrote video games, but I never bothered with BCD numbers. I was aware that they existed, but the whole time that I was doing machine code from 1976 to 2000, I never bothered to learn how they worked. I assumed that they were a leftover from when 4-bit processors were doing math on calculators.
How then did I display scores? I converted binary numbers to decimal digits. I didn't know about the Double Dabble algorithm. The more complicated way to do it involves a bunch of compares and maybe some division.
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