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Sorcim published SuperCalc, an early spreadsheet application for CP/M-80, in 1980. While VisiCalc was the most popular spreadsheet at the time, it was not available for CP/M-80; SuperCalc was made to try to fill that void. Quickly becoming popular for CP/M, it was ported to MS-DOS in 1982. As a direct improvement over VisiCalc, SuperCalc was one of the first spreadsheet applications able to iteratively solve circular references. Excel did implement this feature, but it took them over 10 years after the release of SuperCalc to do so. This feature was added to SuperCalc when Sorcim changed to binary math from binary-coded decimals. SuperCalc was later ported to Apple II and MS Windows under the name CA-SuperCalc. The MS-DOS versions were more popular than Lotus 1-2-3 because of their lower price and lack of copy protection. New versions were released in the early 1990s, until Microsoft Excel took over the market.