The docs linked below are old and may contain inaccurate information.
For the most up-to-date information, please see the
NESDev Wiki.
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If anyone out there is multi-lingual, and would translate any of these docs to any language, contact me.
Also, if there are any older docs on here that are known to be horribly inaccurate to the point of being useless, let me know so I can kill it.
2-22-2010 update: PC Apps / PC NES transfer cable v1.30 by sepi. Connects a PC parallel port to the NES control port, schematic included. It allows you control a game with a PC keyboard to log and play back button presses. Previous versions: [v1.2]
2-19-2010 added: PC Apps / 6502 / nlgen by Derek Andrews. Converts CA65/LD65 listings and map file into namelist files consumable by the FCEUXDSP 1.07 emulator.
Consider making a donation of any amount to help pay for hosting costs (which includes every site hosted on Parodius). The paypal link will be found on Parodius' main page.
The Cheapocabra developer cartridge is in production by Membler Industries. More details to come.
2A03 technical reference First release (4-23-2004), by Brad Taylor. Covers everything related to the NES's CPU, including sound. The linear counter section needs to be written, if anyone experienced with this is interested in documenting it, please post on the forum.
NTSC 2C02 technical reference First release (4-23-2004), by Brad Taylor. Lots of information about the NTSC version of the NES PPU.
Famicom Disk System Loader by Brad Taylor. This is the software and documentation for a hardware project to emulate the FDS's disk drive using a PC disk drive via parallel port. Can also copy FDS disk contents to your PC.
FDS Copy Tool info from a book in Japanese. Contributed by Tomy.
Information related to the emulation of the NES/Famicom.
NES emulator development guide 4th release (4-23-2004), by Brad Taylor. Lots of information and techniques about emulating the NES.
Skate or Die 2 (title theme) Recorded by Memblers, through the audio output of an NES. This Rob Hubbard tune uses raw PCM output ($4011) that few (if any) emulators play correctly.
Comic Bakery Recorded by Chris Covell. This is an MP3 of how this cover of a Martin Galway song plays on a real NES (The one in the Stars SE demo). It doesn't sound too good, due to some scarcely documented um.. features of the NES's sound hardware. Since it does a great job of highlighting these features, it may be be useful for emulator authors who want to improve their sound emulation accuracy. This MP3 is in stereo, the square waves are in the left channel, the triangle is in the right one. The noise channel isn't used.
If you're wondering, these features were compensated for in Bananmos's newest sound code (as used in Solar Wars), and it is now 100% cool on real NES. =)
2003 MiniGame Compo multicart packed and menu'd by Memblers, music covered from C64 Wizardry, sound code by Bananmos, FilePack code by Mickael Pointier. Features all the NES games entered in the 2003 MiniGame Compo.
BoxBoy by Neil Tew. An action puzzle game. By controlling 4 seperate characters, arrange the boxes in the correct order before they drop off the screen. 2003 MiniGame Compo entry (4KB category), placed 9th of 37.
Bomber 4K by RoboNes. Perilously fly over 3 cities and destroy each one to win. 2003 MiniGame Compo entry (4KB category), placed 31st of 37.
Escape from Pong by Halley's Comet Software. You play as a Ping Pong ball, trying to escape from 12 paddle and obstacle-filled levels. 2003 MiniGame Compo entry (1KB category), placed 12th of 26.
Galaxy Patrol by Michael Martin. Fly through the starfield, avoid stars and collecting fuel. 2003 MiniGame Compo entry (4KB category), placed 36th of 37.
DMC-Based Saw Waves by blargg. Information about how this accomplished, and an NES ROM and MP3. Off-site link.
Years Behind by Retrocoders. This music rom features covers and original music. Compatible with PAL NES only. No sources.
BKG Graphics Test by Beneficii. A little maze game. A map editor is included.
Overtest by Alastair Bridgewater. Tests the CPU's overflow flag.
Raster Demo by Norix. This demo is an excellent example of what can be done by tweaking the PPU's nametable addressing with timed code (NTSC, in this case).
TANESPOT by Jonathan Liss. This PAL NES demo, A Tribute to All NES Players Out There, placed 3rd of 4 in the Oldskool demo category of Dreamhack 2002.
Manhole Program by KZ-S, Graphics by misaki, special thanks to Norix.
Masmix v0.6 beta, code by Wojciech Andralojc, sprites by Kamil Chlodnicki, levels by Monika Subocz.
Matrix v0.6 beta, code by Wojciech Andralojc, sprites by Kamil Chlodnicki, levels by Monika Subocz.
demo by Siudym. Made with a hex editor. No source code, of course.
The Duel by Bokudono. A small game that pits Mario against a jumping goomba in a fight to the finish. Here is the source. (Comments are in spanish)
Game Genie by Codemasters. This is a dump of the ROM used in the Game Genie. Galoob has kindly given permission for free distribution. No source code, obviously.
NES Scrolling Test Multidirectional scrolling test program, also detects PAL/NTSC. Uses MMC1 mapper + one screen mirroring. Player 1´s controller adjusts scrolling (and A or B buttons stop scrolling).
FDS Test 2 FDS programs, one plays music from Ai Senshi Nicol by Konami while displaying the FDS Wave-RAM, the other is an FDS version of the Stars SE demo.
Sayoonara A nice demo, with something extra. Ripped music. No sources.
Super Fighter demo A 1-screen demo related to Super Fighter. Code by Chis Covell, music covered by Memblers (original by Young Soung Wing), and sound code by Bananmos.
Wavy CMC logo with good scrolling effects and palette cycling.
Mega Man jet A picture of Megaman flying above some clouds.
Solar Wars A freeware Scorched Earth type of game. Code, graphics, and design by Chris Covell, music by Memblers, and sound code by Bananmos. Here is the source code.
Stars SE An intro with a Martin Galway tune done on the NES by Memblers. The sound code was written by Bananmos.
Elite by Ian Bell and David Braben. There never was an NTSC release of this game, but later hack was released which allowed it to run on an emulator (with the right settings). Won't work on a real NES or accurate emulator. No sources. [site]
Fade to Black by Fredrik Schultz and Morgan Johansson (authors of A/NES). It's a picture of Metallica with a nice rendition of 'Fade to Black'. No source code.
Snow Intro Code by Repulse, graphics by _Bnu, and music by Random, which was re-done for the NES by Memblers. The music code was written by Bananmos. No source.
Munchie Attack Eat all the food that you can, while avoiding the deadly shuriken. Inspired by 'Fast Food' on the 2600 VCS. 2003 MiniGame Compo entry (4KB category), placed 26th of 37.
Hot Seat Harry A 1023 byte game for one or two players. Press the A button as fast you can to shock your opponent. [homepage] Released at 2002 MiniGame Compo. Finished 52nd out of 62. No source.
Dropoff 7 The story of Dropoff 7, played through the NES's Delta-modulation channel.
Halloween Intro A small program for Halloween. Doesn't do much. Code/graphics/music by Memblers, sound code by Bananmos.
RTC A demo entered into the Y2Kode programming competition, recieved 2nd place out of 6 entries. This version is buggy and not recommended for a real NES.
NES Test Program v1.3 Write to any register/RAM location with this program.
Visual Player Shows some sprites to go along with the Silver Surfer NSF rip, with music by Tim and Geoff Follin.
Visual Player Source Source code for the program. Can be modified to work with other NSF rips. Send me an email if you're interested in a newer, enhanced version of this.
PC Programs
6502 Tools
Most popular assemblers
cc65 A portable 6502/65c02/65c816 assembler, linker, and C compiler.
NESASM 3 by Charles Doty, David Michel, and J.H. Van Ornum, originally part of MagicKit. (Also older NESASM v.1)
Other tools
nlgen by Derek Andrews. Converts CA65/LD65 listings and map file into name list (.nl) files readable by the FCEUX emulator.
6502 hex-to-mnemonix by juicy_killa@hotmail.com. A convenient reference program for viewing hex codes for 6502 opcodes. Email the author if you have any corrections or suggestions.
FASM v1.0 by Toshi Morita. Quote from the docs: FASM was written as a quick replacement for the 2500 AD assembler for Nintendo 8-bit development. GPL license.
Interactive Disassembler freeware version, by DataRescue. The commercial version is better, but it's expensive.
NESrev v.013 by Kent Hansen. This disassembler detects the differences between code and data, and aims to produce output that can be reassembled. Works with 16KB programs. [Java source]
nbasic A high-level programming language for 8-bit NES development, by Bob Rost.
P65 Assembler A portable 6502 assembler written in Perl.
WLA DX A portable GB-Z80/Z80/6502/6510/65816 macro assembler. Linux and MS-DOS versions available.
6502 SDK Quoted from the docs: The kit is an Integrated Development Environment (IDE) similar to Borland ones, which allows you to edit, compile and (hopefully) debug
your Assembly code for 65xx processors. It includes a (still rudimental) emulator and a project manager for multiple file applications. Requires Win3.11 or higher. Here's the source code.
Open tUME A 2D level editor designed for game development, check it out!
NES Screen Arranger Uses NES graphics from a .CHR file and let's you set up the name and attribute tables, with optional RLE compression. By SnowBro.
Tile Layer v0.50b. Let's you edit graphics from roms for various consoles. By SnowBro.
BMP2NES by 7h1460. Converts BMP graphics to the NES's format.
RAW2CHR by Chris Covell. Converts graphics from RAW to the NES's format.
CHARlie by Chris Covell. Optimizes graphics by removing redundant tiles.
CHR2NAM by Chris Covell. Creates a nametable from an image file.
pilbmp2nes by Damian Yerrick. Command-line image converter from indexed BMP/GIF/PNG to 1-bit, NES, Game Boy, Genesis, SNES 4-bit, or SNES mode 7 format. Requires Python and Pillow (Python Imaging Library).
savtool by Damian Yerrick. Converts graphics from indexed BMP/GIF/PNG to NES CHR and nametable, automatically determining attributes and removing redundant tiles. Requires Python and Pillow (Python Imaging Library).
Misc.
uCON64 (offsite link) ROM management utility. Can convert between file formats, split iNES images into PRG and CHR ROMs (use Pasofami format to do this), and much more.
Game Genie Code Coverter v4.0 by Zazer. Create new, or decode existing Game Genie codes for NES and all other GG-platforms.
Roller Coaster by Pan/ATX. This program can generate various sine and non-repeating random data tables to use in your games/demos.
Famicom Disk System Loader by Brad Taylor. This is the software and documentation for a hardware project to emulate the FDS's disk drive using a PC disk drive via parallel port. Can also copy FDS disk contents to your PC.
Legacy of the Wizard map viewer by Brad Taylor. Programs to view the maps from this game. Includes a bitmap graphic of the entire map.
FDSList v1.2 by Chris Covell. Lists and extracts files from Famicom disk images. Supports FDS format.
Decrom v2.0 by Fx3. Converts VROM graphics into ascii.
VRC-VII Emulator By Kevin Horton. VRC7 is a Konami mapper/sound-chip, with FM synthesis.
Nerdtracker 2 beta version by Bananmos. A DOS/Win9X NES music tracker. The NT2 site also has replay source code for NES, an assortment of songs made by NT2 users, and more.
MCK by Izumi. A sound driver using MML format. Off-site link.
NED2NSF v1.0 by Matrixz. Windows program that can make a single-song NSF from a NED file (Nerdtracker 2 format). Does not support NEDs with DMC samples, currently.
MIDIMML converter v1.0 by Tom Murphy 7. [link] This program converts MIDI files (with some special annotations) into MML. The output wouldn't be as optimal as hand-crafted MML (in most cases), but it's very interesting and even useful for MIDI users, nonetheless.
MCKC: MCK > MML Converter by Manbow-J, translated by virt. This document shows you how to use MML to create NES music.
PC NES transfer cable v1.30 by sepi. Connects a PC's parallel port to the NES control port, schematic included. It allows you control a game with a PC keyboard to log and play back button presses. Previous versions: [v1.2]
Famicom Disk System Loader by Brad Taylor. This is the software and documentation for a hardware project to emulate the FDS's disk drive using a PC disk drive via parallel port. Can also copy FDS disk contents to your PC.
CopyNES by Kevin Horton. NES modification that allows reading and writing of cartridges.