 There are basically three revisions of the DPMS specification, DPMS beta, DPMS 1.0 (original Novell DOS 7 shipment) and DPMS 1.1 (since March 1994 update).The 1.0 specification continued to support the beta specification as well, whereas the 1.1 (and higher) implementation does not.DPMS saw its debut in beta versions of DR DOS "Panther" in October 1992, which, besides others, came with DPMS-enabled versions of the Super PC-Kwik disk cache, Addstor's SuperStor disk compression, and DEBUG as "stealth" protected mode system debugger.