sentences:  Known versions are DR DOS 3.31 (BDOS 6.0, June 1988, OEM only), 3.32 (BDOS 6.0, August 17, 1988, OEM only), 3.33 (BDOS 6.0, September 1, 1988, OEM only), 3.34 (BDOS 6.0, OEM only), 3.35 (BDOS 6.0, October 21, 1988, OEM only), 3.40 (BDOS 6.0, January 25, 1989), 3.41 (BDOS 6.3, June 1989, OEM and retail).Like MS-DOS, most of them were produced in several variants for different hardware.While most OEMs kept the DR DOS name designation, one OEM version is known to have been called EZ-DOS 3.41.