If you're looking for an Amos interpreter on AOS 4 you'll just have to make do with
EUAE running AmosPro or wait until Muzero and friends finish
Alvyn Basic which should be mostly portable to many platforms. And to compile this wonderfulness in an OS4 compatable way you'll have to wait for
Mattathias Basic compiler to come out. As for re-sourcing extensions, good luck, you may need it.
Also as a final note the source code to Amos is
here.
