Ok I'm really ticked that lazy Noobs can't read my past posts on this very subject !!!
Ok for you lazy goofball noobs here is the guide for Sonic Adventure 2 for Dreamcast Emulators.
Lesson 1 Grasshopper for Chankast emulator
#1 Make sure you have dc_bios & dc_flash. Place files in the same folder as Chankast.
#2 The Chankast will not read ISO'S. It reads real CD games. You will need Daemon Tools or Alcohol 120% to "trick" the Chankast into thinking your ISO's are real CD games.
#3 Now after you have downloaded Sonic Adventure 2 (all the parts) and extracted it from the RAR. You will get a ISO called "SONIC2_ECH" MDF/MDS.
#4 To play it Grasshopper you will do this. First you will use Daemon Tools or Alcohol 120% to mount your MDS file.Then hit run & start. Set your date & time then play.
#5 For best results go under " Options " then "Configure Video" then check off " Use ZWrite " also check off " Use AlphaTest ZWrite "
#6 The Capcom Hack is strictly for Capcom Games . DUH !!
The emulation is not perfect but fully playable.
If you expect perfection then go buy a real Dreamcast !!
#2 Install NullDC & click on the NullDC shortcut. Now 2 screens will pop up. One is the NullDC and the other is a black screen with a bunch of "nerd jibberish". Do not close out the black screen.
#3 The NullDC will read ISO's so Daemon Tools & Alcohol 120% are not required.
#4 To play just select "File" then "Normal Boot" then find your Sonic Adventure 2 and open your MDS file.
#5 Under Options,PowerVR,make sure you have Use "ZWrite" & "Use Alpha Test ZWrite" check marked. If it plays to fast then undo one or both check marks.
The emulation is not perfect but fully playable.
If you expect perfection then go buy a real Dreamcast !!
Now your set. ************************************************************************ Now goofballs READ THE FORUM before asking this question 100,000,000 more times.
Nulldc emulator are easy to find, i can give you link to nulldc latest version here is the link:http://www.filesend.net/download.php?f=31a6d7166e982918ee124544b8f6f295
then your computer can't handle it. 
