Answer: The SCSI connector on the VS-1880 is only used to connect a Roland CD Recorder, such as the VS-CDRII or the VS-CDR3. It is not possible to connect the VS directly to a computer via the SCSI connector. The CD burner is required if you want to back-up your recordings, or if you want to burn audio mixes of your songs to CDR directly from the VS-1880.
For information about transferring tracks from the VS-1880 to a computer, read here: Roland Track Talk