Well, I just tested it and it appears I am right.
Both chips should be connected in parallel (ie: All connections to pins from XBOX should go to pins on both chips), except for the init line.
The init line must be setup through jumpers or a switch so that one chip receives a high signal, while the other chip received a low signal. If you do this you can easily switch between two chips.
However, I haven't had any luck flashing these using the cromwell flash bios yet. My original intent was to set these up so that one chip would be write protected and loaded with cromwell, and the other not, to be loaded with Evox bios. This way if one were to put a bad flash on the evox chip, you could simply switch to the other and fix it easily.
I'll let you know if I get any further.
One other interesting item: If you want an LED for write protect, you can set it up like this if you want to keep components to a minimum:
+5 volts (not the 3.3 Volts the chip uses) ----(*RED* LED)-----(Switch)-----o-----(270 Ohm resistor)-----Ground
Connect "o" to the pins listed here:http://www.xbox-scene.com/articles/cheapmo...lashprotect.php
Note to the pedantic: +5 volts isn't safe for the chip. That why you have to use a Red LED. It will drop 1.8 volts. Using other LED colours may work, but some (for example, green) drop too much voltage and may not be reliable.
Next job far in the future: Figure out how to recreate #LFRAME with a PIC!