Just found the archived announcement letter:
IBM Announcement Letter Number P80-114 dated June 11, 1980
DATA FACILITY/DATA SET SERVICES
RELEASE 1
5740-UT3
The Data Facility/Data Set Services program product assists
OS/VS (MVS and VS1) users with protection and recovery of
information on IBM direct access storage devices, including the new
3380 and 3375, and IBM 3850 Mass Storage System (MSS) virtual
volumes, by providing full volume, partial volume, and data set
dump and restore facilities.
<SNIP>
Planned availability: December 1980. 3375 support will be
available third quarter 1981.
Geoff Rousell
IBM z Systems SE
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