The files likely correspond to the following HP part numbers:

basic01.asm	20392-80001	Basic Rev. A source tape
basic02.asm	20392-80002	Basic Rev. A source tape
basic03.asm	20392-80003	Basic Rev. A source tape
basic04.asm	20392-80004	Basic Rev. A source tape
basic05.asm	20392-80005	Basic Rev. A source tape
basic06.asm	20392-80006	Basic Rev. A source tape
basic07.asm	20392-80007	Basic Rev. A source tape
basic08.asm	20392-80008	Basic Rev. A source tape
basic09.asm	20392-80009	Basic Rev. A source tape
basic10.asm	20392-80010	Basic Rev. A source tape
basic11.asm	20392-80011	Basic Rev. A source tape
basic.lst	20392-90001	Basic Rev. A source listing
basic.abs	20392-60001	Basic Rev. A binary tape

prepare01.asm	20392-80012	Prepare Basic System Rev. A source tape
prepare02.asm	20392-80013	Prepare Basic System Rev. A source tape
prepare03.asm	20392-80014	Prepare Basic System Rev. A source tape
prepare.lst	20392-90002	Prepare Basic System Rev. A source listing
prepare.abs	20392-60002	Prepare Basic System Rev. A binary tape