M include/mgba/internal/gb/io.h → include/mgba/internal/gb/io.h

@@ -102,8 +102,8 @@ REG_SVBK = 0x70,
 	REG_UNK72 = 0x72,
 	REG_UNK73 = 0x73,
 	REG_UNK74 = 0x74,
-	REG_UNK75 = 0x75,
-	REG_UNK76 = 0x76,
+	REG_PCM12 = 0x75,
+	REG_PCM34 = 0x76,
 	REG_UNK77 = 0x77,
 	REG_MAX = 0x100
 };

M src/gb/io.c → src/gb/io.c

@@ -101,7 +101,6 @@ [REG_OCPS] = 0x40,
 	[REG_BCPS] = 0x40,
 	[REG_UNK6C] = 0xFE,
 	[REG_SVBK] = 0xF8,
-	[REG_UNK75] = 0x8F,
 	[REG_IE]   = 0xE0,
 };