Read the description for REDMAT.BAS. Apparently this started with Microsoft Professional Basic 7.0, which appeared in 1989. So technically, "the 1980s," but onl

Read the description for REDMAT.BAS. Apparently this started with Microsoft Professional Basic 7.0, which appeared in 1989. So technically, "the 1980s," but only the last one. https://www.cambridge.org/core/books/abs/crystal-field-handbook/qbasic-programs/A29283BBE4A1C877B9590E4A2094DF00 https://www.cambridge.org/core/books/abs/crystal-field-handb...