Searching through TT revealed that there isn't a complete list of Common Ground Pads/Sticks out there ready for general consumption. I thought having one long list (thread) would be useful after I posted a similar question on my FB page. Since may of us TT folks like using custom sticks or modifying off the shelf stuff and the latest Fighting Game Tourney news suggests PS4 is the future... it made sense to have discuss some Pad hacking options. So here goes (some from my thread with real names, they won't be used for privacy)...
PS4
Guilty Gear Collector's edition pad - PS4 - Confirmed by Gummo
Hori Fighting Commander 4 - PS4 - Confirmed by Gummo
Hori Fighting Stick Mini 4 - PS4/PS3 - Confirmed by @Jasen Hicks [No inversion, No diodes needed]
PS3
XBOX ONE PADS
XBOX ONE Mini series (triggers need to be inverted) - XBOX ONE - Confirmed by Gummo
Hori Pad One (triggers don't need to be inverted) - XBOX ONE - Confirmed by Gummo
PDP MKX Pads - Confirmed by ???
XBOX 360
Rock Candy - XBOX 360 - Confirmed by Confirmed by Gummo
Mad Catz 4716 PAD (triggers need to be inverted on most revisions) Can be rebranded as GameStop, not to be confused with the PDP made version. - Darksakul
Mad Catz 04758 ARCADE GameSTICK for Xbox Live Arcade (triggers need to be inverted) - Darksakul
PDP 360 Versus Pad (may not be suitable for dual-mod as all the buttons and directions are active-high - Darksakul/FreedomGundam
It's fine for use on its own, though. Just don't plan on using it in a dual-mod.
Nintendo - NES/Famicom
Lacks system Plug/ hardwired to console, electrically compatible with US/European NES consoles - Darksakul
Original Nintendo Japanese Famicom Controllers - Common Ground (both players, both the round and square button varieties) - Darksakul
Sharp Famicom Twin Controllers, all variants (Common ground) - Darksakul
Famicom Titler Controllers (Common ground, identical to Famicom Twin Controller) - Darksakul
Famicom versions used a deep socket DB 15 similar to Neo Geo controllers, electrically compatible with US/European NES consoles. - Darksakul
Original Nintendo Nintendo Entertainment System Controllers - Darksakul
Original Nintendo NES2/NES Top Loader/Famicom AV "Dog Bone" controllers - Darksakul
Hudson Soft Joy Card Famicom Controller (includes the original and the Hector 87 controllers) - Darksakul
Hudson Soft Joycard Sansui SSS NES/Famicom (Needs to test)
Hori NES and Famicom gamepad - Darksakul
NES Max - Darksakul
Nintendo NES Advantage stick - Darksakul
ASCII STICK Controller AS-2088-FC - Darksakul
Yobo Knock off NES/Famicom controller - Darksakul
Super Nintendo/ Super Famicom
Original Nintendo SNES/SFC Gamepad - Darksakul
Nintendo/Hori Super Game Boy Controller - Darksakul
NEO-GEO
AES Stick - Common Knowledge
NGCD Pad - Common Knowledge
NEO-GEO CD Controller Pro - Common Knowledge
Multi-Console PCBs
PS360+ - XBOX, PS2, PS3, XBOX 360, NES, SNES, DREAMCAST, SATURN, Limited PS4
Toodles MC Cthulhu - PS3, PS2, PSX, PC, Gamecube, Wii through Gamecube controller Port, Xbox, Dreamcast, Sega Saturn, TurboGrafx-16/PC-Engine, NES/Famicom, SNES/Super Famicom
Mayflash - PS3 XBOX 360 - Has separate grounds, all 0 volts. You can crossover to any one and the inputs to work fine. Shorting all "grounds" to each other seems to work.
Post your findings in the comments (format like I did for easy of copy/paste) and I will keep this top thread up to date.
I recommend keeping the discussion to the pads and technology and not the shops/sites/etc that carry them. If you need to find one listed, I recommend checking here: www.google.com
PS4
Guilty Gear Collector's edition pad - PS4 - Confirmed by Gummo
Hori Fighting Commander 4 - PS4 - Confirmed by Gummo
Hori Fighting Stick Mini 4 - PS4/PS3 - Confirmed by @Jasen Hicks [No inversion, No diodes needed]
PS3
XBOX ONE PADS
XBOX ONE Mini series (triggers need to be inverted) - XBOX ONE - Confirmed by Gummo
Hori Pad One (triggers don't need to be inverted) - XBOX ONE - Confirmed by Gummo
PDP MKX Pads - Confirmed by ???
XBOX 360
Rock Candy - XBOX 360 - Confirmed by Confirmed by Gummo
Mad Catz 4716 PAD (triggers need to be inverted on most revisions) Can be rebranded as GameStop, not to be confused with the PDP made version. - Darksakul
Mad Catz 04758 ARCADE GameSTICK for Xbox Live Arcade (triggers need to be inverted) - Darksakul
PDP 360 Versus Pad (may not be suitable for dual-mod as all the buttons and directions are active-high - Darksakul/FreedomGundam
It's fine for use on its own, though. Just don't plan on using it in a dual-mod.
Nintendo - NES/Famicom
Lacks system Plug/ hardwired to console, electrically compatible with US/European NES consoles - Darksakul
Original Nintendo Japanese Famicom Controllers - Common Ground (both players, both the round and square button varieties) - Darksakul
Sharp Famicom Twin Controllers, all variants (Common ground) - Darksakul
Famicom Titler Controllers (Common ground, identical to Famicom Twin Controller) - Darksakul
Famicom versions used a deep socket DB 15 similar to Neo Geo controllers, electrically compatible with US/European NES consoles. - Darksakul
Original Nintendo Nintendo Entertainment System Controllers - Darksakul
Original Nintendo NES2/NES Top Loader/Famicom AV "Dog Bone" controllers - Darksakul
Hudson Soft Joy Card Famicom Controller (includes the original and the Hector 87 controllers) - Darksakul
Hudson Soft Joycard Sansui SSS NES/Famicom (Needs to test)
Hori NES and Famicom gamepad - Darksakul
NES Max - Darksakul
Nintendo NES Advantage stick - Darksakul
ASCII STICK Controller AS-2088-FC - Darksakul
Yobo Knock off NES/Famicom controller - Darksakul
Super Nintendo/ Super Famicom
Original Nintendo SNES/SFC Gamepad - Darksakul
Nintendo/Hori Super Game Boy Controller - Darksakul
NEO-GEO
AES Stick - Common Knowledge
NGCD Pad - Common Knowledge
NEO-GEO CD Controller Pro - Common Knowledge
Multi-Console PCBs
PS360+ - XBOX, PS2, PS3, XBOX 360, NES, SNES, DREAMCAST, SATURN, Limited PS4
Toodles MC Cthulhu - PS3, PS2, PSX, PC, Gamecube, Wii through Gamecube controller Port, Xbox, Dreamcast, Sega Saturn, TurboGrafx-16/PC-Engine, NES/Famicom, SNES/Super Famicom
Mayflash - PS3 XBOX 360 - Has separate grounds, all 0 volts. You can crossover to any one and the inputs to work fine. Shorting all "grounds" to each other seems to work.
Post your findings in the comments (format like I did for easy of copy/paste) and I will keep this top thread up to date.
I recommend keeping the discussion to the pads and technology and not the shops/sites/etc that carry them. If you need to find one listed, I recommend checking here: www.google.com