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During my surfing today I happened to find two projects that include SBM.
FreeDOS Beta9 (Final) - http://www.freedos.org/
eXtended Operating System Loader - http://sourceforge.net/projects/xosl/
Maybe others of you would like to share more....
The Slackware Linux distribution (www.slackware.com) includes SBM under the name "btmgr" in the "extra" repository.