@ nicholas
Nice to see someone taking an interest in 68K assembly, its my preferred langauge (other than Scottish), if you want some examples of 68K source code just let me know and I'll send you some of my own stuff (DevPac 68k format) for you to look at and hopefully learn from... 
It's all stuff I've written myself over the years, just don't ask me to explain all there is to know about 68K though as I can easily code in it but explaining to someone how to actually do it is not my strong point... 
You can also download some examples of my source code from here for now if you wish (it ranges from the useful to the downright obscure)... 
http://www.commodorescotland.com/#/downloads/4544143499
Thanks Franko that's very kind of you.
I actually taught myself a bit in the early 90's but gave it up for x86 assembly when I got my first PC circa 1994. Then came work and years of high level stuff to pay the bills.
This time next year I want to be comfortably able to write some intros/demos in the oldskool style.