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94000130 FFFB0000 :
Universal GBA Button Modifier code
Hold These Buttons (regardless of others):
Select

C0000000 00000007 :
Type C : defines the start of the loop code
C0000000 YYYYYYYY : set the 'Dx repeat value' to YYYYYYYY, saves the 'Dx next
code to be executed' and the 'Dx execution status'. Repeat will be executed when
a D1/D2 code is encountered. When repeat is executed, the AR reloads the 'next
code to be executed' and the 'execution status' from the Dx registers
In This Case : Dx repeat value = 0x00000007

020F42C4 01010101 :
Type 0 : 32 bits write (str)
writes word 0x01010101 to [020F42C4+offset])

DC000000 00000004 :
Type DC : adds the offset 'data' to the current offset.
(some kind of dual offset)
DC000000 XXXXXXXX : offset = (offset + XXXXXXXX)
In This Case : offset = (offset + 0x00000004)

D2000000 00000000 :
Type D2 : Used to apply the code type C setting (executes the code(s) after the
type C code n times, n being the Dx repeat value).
Also acts as a 'Full terminator' (clears all temporary data, ie. execution
status, offsets, code C settings...).
D2000000 00000000 : if the 'Dx repeat value', set by code type C, is different
than 0, it is decremented and then the AR loads the 'Dx next code to be executed'
and the 'execution status' (=jumps back to the code following the type C code).
When the repeat value is 0, this code will clear the code status, the offset
value, and the Dx data value (which can be set by codes DA, DB and DC).