Creating a NO-CD file for Games

If you find the place where a game checks CD and you know which jump has to be changed, then you have to remember following information: **You want to jump: change a jump to a unconditional jump ( EB - short jump, E9 - medium jump, EA - far jump ). DON'T CHANGE JUMP TO OPPOSITE ( 74 <-> 75 ), because when you insert CD a game doesn't run. **You don't want to jump: change a jump to some instruction (4048 - push ax, pop ax ). DON'T CHANGE TO 90=NOP, because this value is checked by some programs. If a game show small window with information "Please insert CD", it's done by "MessageBoxA" API function. Go to your favorite debugger and catch the window. In SoftICE you have to type: bpx MessageBoxA The most popular API functions used to check CD are: - GetDriveTypeA - GetVolumeInformationA - GetDriveAttributeA - FindFirstFileA - SetCurrentDirectoryA - GetFileSize - CreateFileA - GetDiskFreespaceA - GetFileAttributeA - mciSendCommandA & mciSendStringA (used to check AudioCD)

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