This puts an array, a “list” at the offset 0xFFFC90 in the FE7 ROM of each item if it is “sacred” or not with that Flash and/or Background Music…
You take the hex value of that item that you want to make sacred/not… and add it to the offset.
For example, Excalibur has the item ID of “0x3D”…
0xFFFC90 + 0x3D = 0xFFFCCD
At 0xFFFCCD, you can have three kinds of values:
0x00 = No BGM or Flash
0x01 = BGM and Flash
0x02 or anything else = Flash Only