0xFD (Unknown Yet)
Has two 8-bit parameters.
Parameters writes to Global Configuration structure (I think :)) at 0x8009A104.
1st parameter offset: 0x5a
2nd parameter offset: 0x56
In structure this two parameters are 16-bit.
Opcode also clears two another 16-bit numbers at offsets 0x58 and 0x5c.
All 4 parameters mentioned are checked in every iteration of opcode processing (this needs more investigation).