xeron: Great link, Thanks!
RedWarrior: As moto said, try 'degrader' - type programs, or try options in Early Startup menu. Are you trying these demos/cracktros from floppy or hard drive... or both? I know my fathers' first Amiga, a 600, could play a few cracktros from the floppy...
Maybe you could give the full config. of your 600?
