question: What used carriage return ( CR ) alone as a line terminator ?
answer: Macintosh OS , Apple DOS , and ProDOS
turker_answer: Macintosh OS , Apple DOS , and ProDOS all used carriage return ( CR ) alone as a line terminator .
rule-based: Macintosh OS , Apple DOS , and ProDOS used carriage return ( CR ) alone as a line terminator .