diff --git a/m68k/handlers.c b/m68k/handlers.c
new file mode 100644
index 0000000..831e190
--- /dev/null
+++ b/m68k/handlers.c
@@ -0,0 +1,14 @@
+void auto_vector_1(void) __attribute__ ((weak, interrupt_handler));
+void auto_vector_1(void) { return; }
+void auto_vector_2(void) __attribute__ ((weak, interrupt_handler));
+void auto_vector_2(void) { return; }
+void auto_vector_3(void) __attribute__ ((weak, interrupt_handler));
+void auto_vector_3(void) { return; }
+void auto_vector_4(void) __attribute__ ((weak, interrupt_handler));
+void auto_vector_4(void) { return; }
+void auto_vector_5(void) __attribute__ ((weak, interrupt_handler));
+void auto_vector_5(void) { return; }
+void auto_vector_6(void) __attribute__ ((weak, interrupt_handler));
+void auto_vector_6(void) { return; }
+void auto_vector_7(void) __attribute__ ((weak, interrupt_handler));
+void auto_vector_7(void) { return; }
diff --git a/m68k/vectors.s b/m68k/vectors.s
index 207cd3f..a225749 100644
--- a/m68k/vectors.s
+++ b/m68k/vectors.s
@@ -25,13 +25,13 @@
         .long  start  /* reserved 22 */
         .long  start  /* reserved 23 */
         .long  start  /* Spurious interrupt */
-        .long  start  /* Auto vector level 1 interrupt */
-        .long  start  /* Auto vector level 2 interrupt */
-        .long  start  /* Auto vector level 3 interrupt */
-        .long  start  /* Auto vector level 4 interrupt */
-        .long  start  /* Auto vector level 5 interrupt */
-        .long  start  /* Auto vector level 6 interrupt */
-        .long  start  /* Auto vector level 7 interrupt */
+        .long  auto_vector_1  /* Auto vector level 1 interrupt */
+        .long  auto_vector_2  /* Auto vector level 2 interrupt */
+        .long  auto_vector_3  /* Auto vector level 3 interrupt */
+        .long  auto_vector_4  /* Auto vector level 4 interrupt */
+        .long  auto_vector_5  /* Auto vector level 5 interrupt */
+        .long  auto_vector_6  /* Auto vector level 6 interrupt */
+        .long  auto_vector_7  /* Auto vector level 7 interrupt */
         .long  start  /* Trap #0 vector */
         .long  start  /* Trap #1 vector */
         .long  start  /* Trap #2 vector */
@@ -64,4 +64,5 @@
         .long  start  /* reserved 61 */
         .long  start  /* reserved 62 */
         .long  start  /* reserved 63 */
+
         .align 0x400, 0xee
diff --git a/scsp.h b/scsp.h
index a0ed924..4d7c04f 100644
--- a/scsp.h
+++ b/scsp.h
@@ -134,6 +134,31 @@ static_assert((offsetof (struct scsp, reg)) == 0x100000);
 
 // bits
 
+enum interrupt_bits {
+  INT__SAMPLE = (1 << 10),
+  INT__MIDI_OUTPUT = (1 << 9),
+  INT__TIMER_C = (1 << 8),
+  INT__TIMER_B = (1 << 7),
+  INT__TIMER_A = (1 << 6),
+  INT__CPU = (1 << 5),
+  INT__DMA_TRANSFER_END = (1 << 4),
+  INT__MIDI_INPUT = (1 << 3),
+  INT__INT2N = (1 << 2),
+  INT__INT1N = (1 << 1),
+  INT__INT0N = (1 << 0),
+};
+
+enum scilv_bits {
+  SCILV__TIMER_B__TIMER_C__MIDI_OUT__1F = (1 << 7),
+  SCILV__TIMER_A = (1 << 6),
+  SCILV__CPU = (1 << 5),
+  SCILV__DMA_TRANSFER_END = (1 << 4),
+  SCILV__MIDI_IN = (1 << 3),
+  SCILV__INT2N = (1 << 2),
+  SCILV__INT1N = (1 << 1),
+  SCILV__INT0N = (1 << 0),
+};
+
 enum loop_bits {
   LOOP__KYONEX = (    1 << 12), // (KX) execute KEY_ON
   LOOP__KYONB = (     1 << 11), // (KB) record KEY_ON, KEY_OFF
@@ -193,8 +218,8 @@ enum mixer_bits {
 };
 
 //enum pitch_bits {
-#define PITCH__OCT(n) ((n) << 11)
-#define PITCH__FNS(n) ((n) << 0 )
+#define PITCH__OCT(n) (((n) & 0xf) << 11)
+#define PITCH__FNS(n) (((n) & 0x3ff) << 0 )
 //};
 
 enum scsp_bits {