Controllers
see controller adapters section below
Mad Catz Dream Pad -- A better version of the official controller
Official Sega Dreamcast Controller
ASCII Pad FT Special -- It comes in three forms: standard grey, the Black Capcom version, and the Blue SNK version. They are similar to a Saturn Controller
Arcade Sticks
Agetec Arcade Stick (Official Sega Product) -- THE BEST, It's the grey one with green buttons
Interact Alloy Arcade Stick -- review
Mad Catz Panther DC Arcade Stick -- review 1 review 2
X-Arcade -- Get this if you don't like buying arcade sticks for every one of your consoles info
Lightguns
Mad Catz DreamBlaster
Official Dreamcast Lightgun -- Only available in Europe and Japan, the only North American game they work with is Virtua Cop 2 (Sega Smash Pack Vol. 1)
Racing Wheels
Thrustmaster Ferrari Racing Wheel
InterAct Concept 4 Racing Wheel
Memory Cards
Nexus 4M Memory Card -- Hook it up to your PC and archive your saves
Sega 4x Memory Card (800 Blocks)
Sega VMU (200 Blocks) -- If you don't like having to change memory banks
Game-Specific Peripherals
Samba de Amigo Maracas -- A must for playing Samba de Amigo
Official Sega Dreamcast Twin Sticks -- Used for playing Virtual On Oratorio Tangram
Official Sega Saturn Twin Sticks with a Total Control 3 (or 5 Plus 3in1) adapter -- May be cheaper and/or easier to find than the above
Official Dreamcast Fishing Controller
Konami Pop'N Music Controller -- Essential for Popper games
Etcetera
Official Sega Keyboard -- For The Typing of the Dead and online communication
Official Sega Mouse -- It has limited uses
Broadband Adapter (BBA)
System Link Cable -- discussion
Performance VGA Box -- "The only Dreamcast VGA box with a passthrough port to switch between PC and DC easily" review
Karaoke Attachment -- A Japanese add-on for singing karaoke info
Dream Eye -- A digital camera for Dreamcast! info
Controller Adapters
There are a ton of adapters. This list is here in its entirity to show what each model does. Based on my personal experience, I'd recommend that you stick with EMS' adapters.
EMS Total Control
Playstation Controllers, supports DualShock, PSX Steering Wheels can be used with a flip of a switch
EMS Total Control Plus
Same as Total Control but it has a VMU slot
EMS Total Control 2
Same as Total Control but it also supports PC keyboards; 4 different modes selectable via a switch
EMS Total Control 3
Saturn Controllers, Racing Wheels and Twin Sticks + a VMU slot
EMS Total Control 5
PC Keyboards and Mouses
EMS Total Control 5 Plus RECOMMENDED :thumbs-up:
Playstation (supports DualShock) & Saturn Controllers, supports Racing Wheels and Twin Sticks + a VMU slot
Skillz Dream Connection 2in1
PC Keyboards and Mouses; supposedly more reliable that Total Control 5
Skillz Dream Connection 3in1
Playstation (supports DualShock) & Saturn Controllers, supports Racing Wheels and PC Keyboards
Skillz Dream Connection 4in1
Playstation (supports DualShock) & Saturn Controllers, supports Racing Wheels and PC Keyboards + a VMU slot
Innovation Dream Connection II 4-way Multiconverter
Playstation & Saturn Controllers, PC Keyboards + a VMU slot
see controller adapters section below
Mad Catz Dream Pad -- A better version of the official controller
Official Sega Dreamcast Controller
ASCII Pad FT Special -- It comes in three forms: standard grey, the Black Capcom version, and the Blue SNK version. They are similar to a Saturn Controller
Arcade Sticks
Agetec Arcade Stick (Official Sega Product) -- THE BEST, It's the grey one with green buttons
Interact Alloy Arcade Stick -- review
Mad Catz Panther DC Arcade Stick -- review 1 review 2
X-Arcade -- Get this if you don't like buying arcade sticks for every one of your consoles info
Lightguns
Mad Catz DreamBlaster
Official Dreamcast Lightgun -- Only available in Europe and Japan, the only North American game they work with is Virtua Cop 2 (Sega Smash Pack Vol. 1)
Racing Wheels
Thrustmaster Ferrari Racing Wheel
InterAct Concept 4 Racing Wheel
Memory Cards
Nexus 4M Memory Card -- Hook it up to your PC and archive your saves
Sega 4x Memory Card (800 Blocks)
Sega VMU (200 Blocks) -- If you don't like having to change memory banks
Game-Specific Peripherals
Samba de Amigo Maracas -- A must for playing Samba de Amigo
Official Sega Dreamcast Twin Sticks -- Used for playing Virtual On Oratorio Tangram
Official Sega Saturn Twin Sticks with a Total Control 3 (or 5 Plus 3in1) adapter -- May be cheaper and/or easier to find than the above
Official Dreamcast Fishing Controller
Konami Pop'N Music Controller -- Essential for Popper games
Etcetera
Official Sega Keyboard -- For The Typing of the Dead and online communication
Official Sega Mouse -- It has limited uses
Broadband Adapter (BBA)
System Link Cable -- discussion
Performance VGA Box -- "The only Dreamcast VGA box with a passthrough port to switch between PC and DC easily" review
Karaoke Attachment -- A Japanese add-on for singing karaoke info
Dream Eye -- A digital camera for Dreamcast! info
Controller Adapters
There are a ton of adapters. This list is here in its entirity to show what each model does. Based on my personal experience, I'd recommend that you stick with EMS' adapters.
EMS Total Control
Playstation Controllers, supports DualShock, PSX Steering Wheels can be used with a flip of a switch
EMS Total Control Plus
Same as Total Control but it has a VMU slot
EMS Total Control 2
Same as Total Control but it also supports PC keyboards; 4 different modes selectable via a switch
EMS Total Control 3
Saturn Controllers, Racing Wheels and Twin Sticks + a VMU slot
EMS Total Control 5
PC Keyboards and Mouses
EMS Total Control 5 Plus RECOMMENDED :thumbs-up:
Playstation (supports DualShock) & Saturn Controllers, supports Racing Wheels and Twin Sticks + a VMU slot
Skillz Dream Connection 2in1
PC Keyboards and Mouses; supposedly more reliable that Total Control 5
Skillz Dream Connection 3in1
Playstation (supports DualShock) & Saturn Controllers, supports Racing Wheels and PC Keyboards
Skillz Dream Connection 4in1
Playstation (supports DualShock) & Saturn Controllers, supports Racing Wheels and PC Keyboards + a VMU slot
Innovation Dream Connection II 4-way Multiconverter
Playstation & Saturn Controllers, PC Keyboards + a VMU slot