Here are two versions of ASI 1.5AM for download. The first is in DCM format, for those downloading to an Atari. Use Disk Communicator to extract it. The second is in XFD format, for those wanting to use it on an emulator. They both have .bin extensions, because geocities doesn't recognise the .dcm and .xfd extensions, so rename the files accordingly after you have downloaded them.
If you're looking for a disk based disassembler, that can produce output for both AMAC and Mac/65, then give ASI a try!