.scope APU
    m_square_1_envelope = $4000
    m_square_1_sweep    = $4001
    m_square_1_low      = $4002
    m_square_1_high     = $4003
    m_square_2_envelope = $4004
    m_square_2_sweep    = $4005
    m_square_2_low      = $4006
    m_square_2_high     = $4007
    m_noise_envelope    = $400C
    m_noise_mode        = $400E
    m_noise_counter     = $400F
    m_dmc               = $4010
    m_status            = $4015
    m_frame_counter     = $4017
.endscope