Tape Drive and Printer

OK, so I'm new to Unix (but an IT since DOS 6.2 era) Long story short I'm truing to help a friend who has failing Unix system which is perhaps 16 years old with SCO Openserver 3.4v4.2 with DDS90 Tape where they backup their data. I've setup a Dell Precision 390 with Unix 5.0.7 HW version and installed a Adaptec AHA-2940AU PCI card (on SCSI default ID 7) with Seagate Scorpion STD224000N Tape Drive (on SCSI ID 6). Question is how do I find the tape and how do I mount it so I can restore the data from the old machine to this.
Please help.
Thanks

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