DMS3 has 5 Boot Modes:
PS2, PSX, DVD Video, Dev.olution and Sleep/Stealth Modes.

• For PS2 Games, use PS2 Mode
• For PSX Games, use PSX Mode
• For DVD Videos, use DVD Video Mode
• To boot applications off the Playstation 2 Memory Card, use Dev.olution Mode

The DMS3 will default to PS2 mode if no button is pressed during startup.

For online games that detect modchips or PS2 Utility Discs (like the DVD Player upgrade disc that comes with the Sony DVD Remote), use Sleep/Stealth Mode.

PS2 Mode, PSX Mode, DVD Video Mode and Dev.olution Mode are all chosen by holding down a specific button on the first-player controller when turning on/resetting the PS2.

Sleep/Stealth Mode is selected by putting the PS2 in to "Stand-by" mode (redlight) and turning on the system by pressing in "Eject" and holding it for 1 second. This will completely disable the chip until you reset the system or power off.