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The O.G. NESasm assembler for NES 6502 assembly, version 3.1 (Latest as of March 2016). Includes Makefile for OS X / Linux / other Unix-like OSes.

Usage
cd source && make && sudo make install

Then run the assembler with nesasm.

See usage.txt for more details.

Credits

Original source, by bunnyboy, is available here. The only modifications I (@camsaul) made were inclusion of the Makefile, which was adapted from the one included with MagicKit, the text files, which were found in various places in the aforementioned sites and by lots of research/searching on my part, and the addition of the resources list below.

Resources

Here are various resources that I've found useful in my quest to master NES homebrew game development: