t allows you to save a current location where your character is standing, then allows you to warp back to that location. It helps a lot against the larger armored enemies if you cant get behind them.
_C0 Mark & Recall Up/Down
_L 0x20001000 0x3C0808B2
_L 0x20001004 0x8D0872F8
_L 0x20001008 0x3C0908B1
_L 0x2000100c 0x8D299F1C
_L 0x20001010 0x340A0010
_L 0x20001014 0x340B0040
_L 0x20001018 0x3C0C0880
_L 0x2000101C 0x152A0007
_L 0x20001020 0x00000000
_L 0x20001024 0xC50B0010
_L 0x20001028 0xC50C0014
_L 0x2000102C 0xC50D0018
_L 0x20001030 0xE58B0FF0
_L 0x20001034 0xE58C0FF4
_L 0x20001038 0xE58D0FF8
_L 0x2000103C 0x8D8D0FF4
_L 0x20001040 0x11A00008
_L 0x20001044 0x00000000
_L 0x20041664 0x0A200400
_L 0x20001048 0x152B0006
_L 0x2000104C 0xC58B0FF0
_L 0x20001050 0xC58C0FF4
_L 0x20001054 0xC58D0FF8
_L 0x20001058 0xE50B0010
_L 0x2000105C 0xE50C0014
_L 0x20001060 0xE50D0018
_L 0x20001064 0x03E00008