questions:
can i disale/enable the xchip? (how?) from manual, dose not allow M$ boot.
can i enable/disable the chip to play xbox live? (how?)
can i enable/disable the xchip to boot standard original xbox dashboard? (how?)

Yes you can disable it. Whenyou turn the box on, press the START button, this will take you to the bios settings. You can set it up to turn it or off with whichever buttons you like. You can set it up to boot to the M$ dash as a standard or your other bios as a standard. It's up to you!