Thanks for the reply!

I have used Think C, but I am really after a pure assembler with symbolic debugger. Something like Devpac on the Atari/Amiga machines.

I have found McAssemly 7.6 which at least has a smallish intro document showing the main characteristics; I'll see what I can do with that. The lack of proper hardware documentation coupled with lack of software documentation is really irking :disapprove: