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-rw-r--r--shared/apu.s3
1 files changed, 3 insertions, 0 deletions
diff --git a/shared/apu.s b/shared/apu.s
index f876d91..35e432f 100644
--- a/shared/apu.s
+++ b/shared/apu.s
@@ -10,6 +10,9 @@
m_triangle_control = $4008
m_triangle_low = $400A
m_triangle_high = $400B
+ m_noise_envelope = $400C
+ m_noise_mode = $400E
+ m_noise_counter = $400F
m_dmc = $4010
m_status = $4015
m_frame_counter = $4017