thanks for the info.

I've found that book and it seems a bit useful. Perhaps i will have to buy some printed book from amazon eventually.

Another problem: which assembler to use?!

the text recommends Lisa, which is freely avaialble.

However I've also found S-C assembler available, as well as ENI (a modernish assembler ).

furthermore, there are payed ones such as ORCA/M.

Since no assembler is compatible with each other I need to choose the best option of course.

Any suggestions?