Firmware Upgrade Mode
The "firmware" stored in the EEPROM on your CC PCB is used for hooking into the PlayStation 2 system software. Upgrading your CC firmware is as simple as downloading, burning, and booting a Crystal Chip Utility Disc. A simple menu allows you to update your firmware without hassles.
Built-in Recovery Mode which may be enabled at any time to allow you to recover from corrupted firmware. Thanks to an internal checksum, CC will automatically detect corrupted firmware and boot in Recovery Mode. In the event that CC fails to automatically detect corrupted firmware, you may force "Recovery Mode" by pressing reset 3 times on startup.
Hardware Sleep Mode
This chip has a "Hardware Sleep Mode" (aka HSM) which allows you to disable your Crystal Chip. Unlike "Software Sleep Mode", HSM does not require any patching to be done in order to get software running which will disable the chip. This is quite useful if you get no video on startup and suspect that your CC may not be working correctly. You may use HSM to disable the chip and see if your PS2 then starts up. If not, it's very likely that the cause is your wiring/etc rather than the chip.
Hardware Sleep Mode may be entered by pressing reset 6 times on startup. Your CC will remain in sleep mode until you power off the console or put it into standby mode, to prevent you from accidentally enabling the chip.
Crystal Chip have a small LED on their PCBs to allow some first installation diagnosis. The following lines show the basic modes:
LED glows for only 1 second on system startup and discs boot = All is fine
LED glows all the time and won't go off = Wrong installation of the bios wires
LED goes off and discs won't boot = Wrong installation of the CD/DVD controller wires
Since the LED can be controlled by the Crystal Chip firmware we can add/change modes.
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