Old PS2 Modchip instructions

From Mexico.purplecow.org

• PS2 mode
  • insert game disk
  • press EJECT to close tray
  • preset RESET once.
• PS1 mode
  • insert game disk
  • press EJECT to close tray
  • press and hold RESET until PS2 powers off to standby
  • press and hold RESET to turn on machine and hold for 2 seconds then release
• DVD regionfree mode
  • insert DVD
  • press EJECT to close tray
  • hold RESET until PS2 powers off to standby
  • press and hold RESET to turn on machine and hold for 4 seconds then release