1 files changed, 8 insertions, 2 deletions

diff --git a/src/common.h b/src/common.h
index 5766565..048708b 100644
--- a/src/common.h
+++ b/src/common.h
@@ -14,6 +14,7 @@ WITH REGARD TO THIS SOFTWARE.
 
 #include "shorthand.h"
 
+#define CPU_FREQUENCY (2 << 23)
 //
 // Memory sections.
 //
@@ -585,10 +586,11 @@ int bios_div(int num, int denom);
 #define SOUND_ENABLE_NOISE_RIGHT   (1 << 0xF)
 
 typedef enum {
+    SOUND_DSOUND  = (0x0 << 0),
     SOUND_SQUARE1 = (0x1 << 0),
     SOUND_SQUARE2 = (0x1 << 1),
-    SOUND_WAVE =    (0x1 << 2),
-    SOUND_NOISE =   (0x1 << 3),
+    SOUND_WAVE    = (0x1 << 2),
+    SOUND_NOISE   = (0x1 << 3),
 } SoundChannel;
 
 u16
@@ -613,6 +615,10 @@ sound_volume(SoundChannel channels, u8 volume) {
 #define SOUND_DSOUND_TIMER_B  (1 << 0xE)
 #define SOUND_DSOUND_RESET_B  (1 << 0xF)
 
+// Direct sound FIFO queues.
+#define SOUND_FIFO_A ((u16*)(MEM_IO + 0xA0))
+#define SOUND_FIFO_B ((u16*)(MEM_IO + 0xA4))
+
 // Sound status bits.
 #define SOUND_ENABLE (1 << 0x7)