You can get the AMOS, AMOS Compiler, AMOS 3D, AMOS Professional disks from
http://www.back2roots.org/ and an amiga disk viewer from
http://www.viksoe.dk/adfview/
That will let you extract AMOS programs from the amiga disks, and load them in my program
But if you want to run AMOS, you will need an emulator, the disks, and some roms.
You can get the emulator, WinUAE from
http://www.winuae.net/
You can get the roms from a real life amiga that you must own
Or:
You can purchase the commercial package, Amiga Forever, from
http://www.amigaforever.com/ which contains WinUAE and special versions of the amiga roms
You should find AMOS is very similar to DarkBASIC