There are 2 things you have to do to use MCBoot.
First, you have to use a program to patch the game ISO before you burn it. This program is called ESR disc patcher GUI (v0.24a.) What this program does is put a fake VIDEO_TS and AUDIO_TS session on the ISO as the first session. Then it moves the game to the second session on the ISO. Here is a link for this program.
http://www.aoinamida.com/fmcbesr/ESR_di ... v0.24a.zip(It is also available for other systems as a java program from
http://ps2-project.org/ps2p/includes/wi ... ?title=ESR)
Seoncd, yes, you just have the card in the system when you power it up. This causes an overflow which triggers McBoot to execute from the card. (As I understand it) Then when MCBoot is done, the disc is read and the exploit kicks in. It sees the disc as a DVD Video but the memory card exploit tells the machine to run a program from the memory card instead of the DVD player software. The system check sees the disc as a DVD Video which is allowed by the system. Bypassing the software check of the system. This program loads instead of the DVD player though and when you hit boot game. This then makes the PS2 read the second session and boot and play the game.
(This software literally takes the place of the DVD player software for the system, but only during the MCBoot process. It is not perminant. The DVD player software can be executed from the expanded system menu and does work with MCBoot loaded. But will not automatically work.)
The only real things you need to do is make sure you've patched your ISO's before you burn them and make sure the memory card is in the unit. There is no need to rig sensors or make any mods to your system in any way.
-Taskforce