if you have any old games they might have workbench files on them. thats how i got my amiga 1000 running years ago on a game called ports of call. if you copy the disk, and erase the game files and rewrite the startup-sequence file you have a workbench disk. except ports of call was os 1.2. there are crossdos like utilities that run on os 1.3. and some stuff on aminet that can split and merge lha files and write dms or adf files back to disk