Links to DBA & HOTT Adaptations...
DBA 1500-1900 Extension (aka Humberside Extensions or DBA-HX), by the Humberside Wargames Society. See also DBA-HX group and Alexei Gartinski's Universal Elements for use with the DBA 1500-1900 extension.
DBA-HX Combat Results Updated to DBA 2.2 (Terry Webb)
NEW DBA-HX 3.0 (1700-1850) (Robert Madrigal)
DBA Renaissance (reference to article in Wargames Illustrated, August 1993)
DBA-RRR by Tony Aquilar (DBA extension for Renaissance, Reformation and Restoration periods, with playsheet and army lists. Accessible through FADBAG Yahoo site)