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The [[libretro]] port of Nestopia has the option to output the raw chroma, level, and emphasis from the PPU through the RGB color channels. This by itself produces an image with completely bizarre colors, but this can be decoded by [[shaders]] to generate actual colors, the main example being [https://github.com/libretro/common-shaders/tree/master/crt/shaders/GTU-famicom GTU-Famicom].
==Hardware Variants==
===Famicom Disk System===
A Japan-only peripheral using the disk format instead of cartridges, with unique games made for it, some of which were later ported to the regular NES/Famicom cartridge format with significant downgrades (especially the loss of enhanced FDS hardware audio).
You'll need the fdsbios file to emulate games made for this peripheral. Switching disk sides will require using "Eject/Insert Disk", "Switch Disk Side", then "Eject/Insert Disk" again.
===VS System===
An arcade system based on the NES released for the US. Most emulators have an option to let you "Insert Coin(s)".
ROMs made with VC system in mind played in the emulator's NES mode, or playing a NES ROM in the emulator's VS mode, will cause the colors to be totally garbled. This is either an issue with the emulator's configuration or the ROM's iNES header.
===Famicom Box===
Also rereleased later as Sharp's FamicomStation. It's a bulky metal cube with a slot to insert money and tons of locks, which was distributed in select hotels and stores. It can hold at once up to 15 select Famicom releases, which much more lockout chips and pins with different behavior than usual, and support for only mapper 0 games. It also has unique boot screen for both models.
Neither the cartridges nor the BIOS have been dumped or tested if they work with an emulator, unlike with the Super Famicom Box which had its BIOS and most ROMs dumped.
===Dendy===
A pirate NES Famicom clone which was sold in Russia and Eastern Europe, with the blueprint reused for other Famiclones. Here's [http://www.youtube.com/watch?v=kne6AKyYUuM a link] to a CC-subtitled Kinaman video for more details. It's a very quirky NTSC NES optimized for 50Hz, with other changes from the official PAL NES - though those differences break compatibility of Dendy-specific releases with most emulators.
MESS supports this console, and FCEUX introduced support for it in r3134, with the already included support for iNES 2.0 ROM headers (which include the option to mark a ROM region as PAL Dendy). The carts themselves can be played as long as the emulator supports broken cards.
Setting the "Family Keyboard" under "Input" might be needed for some of these Famiclones.
==Resources==
*[http://wiki.nesdev.com/w/index.php/Nesdev_Wiki Nesdev Wiki] - A place for all your NES programming, and NES emulator programming needs.
