I think PCDOS/MSDOS copied CP/M's use of CRLF for line separator. Some believe Gary Kildall picked CRLF for CP/M since he used DEC TOPS-10 to develop CP/M. see

I think PCDOS/MSDOS copied CP/M's use of CRLF for line separator. Some believe Gary Kildall picked CRLF for CP/M since he used DEC TOPS-10 to develop CP/M. see https://www.quora.com/Why-did-CP-M-stick-with-the-CR-LF-standard-and-how-did-that-influence-MS-DOS-and-Windows-later-on https://www.quora.com/Why-did-CP-M-stick-with-the-CR-LF-stan...