Loads a byte
Checks every bit
If bit set
	Raw copy source to dest
Else:


r9 = &dest - 1
r10 = &dest + 2
2nd byte is subtracted from r9

If 1st byte >= 10h
	r10 += 1st byte>>4
Else
	r10 += 3rd byte + 10h

r9 -= 1st byte&0Fh << 8


r6:  Settings
r9:  Source
r7:  Dest
r10: End marker