Skelux's Hide HUD

/*
Hide HUD and enable on Button press.
  Button values:
    BUTTON_C_RIGHT = 0x0001,
    BUTTON_C_LEFT  = 0x0002,
    BUTTON_C_DOWN  = 0x0004,
    BUTTON_C_UP    = 0x0008,
    BUTTON_R       = 0x0010,
    BUTTON_L       = 0x0020,
    BUTTON_D_RIGHT = 0x0100,
    BUTTON_D_LEFT  = 0x0200,
    BUTTON_D_DOWN  = 0x0400,
    BUTTON_D_UP    = 0x0800,
    BUTTON_START   = 0x1000,
    BUTTON_Z       = 0x2000,
    BUTTON_B       = 0x4000,
    BUTTON_A       = 0x8000

    Code originally made by Skelux. Please credit him if using the code.
    Ready to be assembled with CajeASM.
*/

.org 0x9EB68
LUI S1, 0x8034
LB S1, 0xAFA1(S1)
ADDIU S2, R0, 0x0010
BNE S2, S1, 0x0009ED18
NOP

.org 0x9EDA0
LUI S4, $8034
LB S1, $AFA1 (S4)
ANDI S2, S1, $0020 // Button Check for displaying HUD. (Button L)
BEQ R0, S2, $0009EDEC
LH S0, $001E (SP)
JAL $002E3744
LUI S3, $8033
JAL $002E37A8
LB S1, $AFDB (S4)
JAL $002E380C
ANDI S2, S1, $0020 // Button check, which plays sound. (Button L)
BEQ R0, S2, $0009EDEC
LUI A0, $701A
ADDIU A1, S3, $3F10
JAL $0031EB00
ORI A0, A0, $8081
NOP
NOP
NOP
ANDI T9, S0, $0020