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by druzyek
1600 days ago
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The BCD processing was indeed a big advantage of the V20, which is why Casio used it in graphing calculators like the AFX 1.0 and 2.0. One point about comparing to the 8087 is that the 18-digit packed BCD format the 8087 used was converted internally to binary before doing any calculations. This lost the advantage BCD has of avoiding rounding errors between decimal and binary and was no better than regular binary calculations. The V20 BCD instructions didn't have that problem. |
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Wow! Didn't know that! I'm impressed there is even a VT-100-compatible terminal for it.