6502 assembly language.

I got into assembly programming for the MOS Technology 6502 in 2020 and programmed a game, Brew-Off!, for the Nintendo Entertainment System. Here's some notes and links I've accumulated along the way!

links.

tutorials & books.

• 6502.org tutorials.
• Programming the 6502, by Rodnay Zaks.
• nerdy nights, a tutorial series for making NES games.

examples.

• famicom cookbook.
• C-style structures in 6502.
• go6502 cookbook.
• c language examples for cc65.

reference material.

• 6502 instruction set reference.
• NES reference guide.
• 6502 addressing modes.

tools.

• asm6, an assembler in one .c file.
• asm6's readme.txt, for reference on add'l features like macros.
• cc65, a c compiler for 6502.
• pretty6502, a 6502 assembly formatter.
• fceux, a cross-platform NES emulator.
• nasu, a lightweight, cross-platform sprite sheet editor.
• pently, a NES music engine.
• FamiTracker, a Windows tracker for producing NES music.
• 0CC-FamiTracker, a modified version that has some new features.
• cfxnes, a javascript NES emulator.
• go6502, a golang 6502 assembler/debugger.
• l65, a lua-based 6502 assembler.

NES palette.

various one-liners.

• convert 30 to hex in Perl (prints "1E"):
  perl -E 'printf("%X\n", 30)'
• convert 0xAB to decimal in Perl (prints "171"):
  perl -E 'say 0xAB'
• view a binary file as hex data:
  xxd file.bin | less
• split a file into 4096-byte chunks:
  split -b4096 sprite.chr sprite_split_
• remove the first 16 bytes from a file:
  dd if=in.nes of=out.nes ibs=16 skip=1
• run pretty6502 to tidy code in vim:
  :%!pretty6502 /dev/stdin /dev/stdout 2>/dev/null
• get loc for .asm files in a dir:
  find . -iname "*.asm" -print0 | xargs -0 wc -l