Preferred Assembler for X16 Dev in X16 Programming Support Posted yesterday at 01:41 PM I guess I'm the odd one out I'm using 64tass. It's the cross assembler version of what used to be turbo assembler/ turbo macro pro on the C64 natively in the past. It has a few nice features that I make use of in the code generation backend of the Prog8 compiler. Like automatically rewriting branch statements into a jmp when the branch offset gets too large, or vice versa, and automatically eliminating unused code blocks. It does lack a "linker" step so can't be easily integrated with code coming from elsewhere.