I remember playing with the builtin libraries and coming up with the verdict that the libraries were far too slow for what I wanted to do. I then got a copy of the Amiga hardware reference manual and had much more fun. I'm sure most Amiga nuts will remember bouncing copper bars, which was always the first hardware hackers demo, followed by spinning 3D floppy disks and the like, those always seemed to be the first demos by people getting into assembler development. I also remember writing a track loader as I wasn't impressed with the standard OS disk routines (and the famous 0×4489 disk sync).