diff --git a/.gitignore b/.gitignore
index 6c08c3d..a1541a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+*.d
 *.gch
 *.o
 *.elf
diff --git a/Makefile b/Makefile
index 7068c31..9397f81 100644
--- a/Makefile
+++ b/Makefile
@@ -81,7 +81,7 @@ common/keyboard.hpp: common/keyboard.py
 common/keyboard.cpp: common/keyboard.py common/keyboard.hpp
 	python common/keyboard.py definition > $@
 
-smpc/input_keyboard.o: common/keyboard.hpp
+smpc/input_keyboard.cpp.d: common/keyboard.hpp
 
 smpc/input_keyboard.elf: smpc/input_keyboard.o sh/lib1funcs.o res/dejavusansmono.font.bin.o common/keyboard.o common/draw_font.o common/palette.o
 
@@ -90,7 +90,7 @@ wordle/main_saturn.o: common/keyboard.hpp
 wordle/word_list.hpp: wordle/word_list.csv wordle/word_list.py
 	python wordle/word_list.py > $@
 
-wordle/wordle.o: wordle/word_list.hpp
+wordle/wordle.cpp.d: wordle/word_list.hpp
 
 wordle/wordle.elf: wordle/main_saturn.o wordle/wordle.o wordle/draw.o sh/lib1funcs.o res/dejavusansmono.font.bin.o common/keyboard.o common/draw_font.o common/palette.o
 
diff --git a/editor/main_saturn.cpp b/editor/main_saturn.cpp
index 0a8be84..0fc0e85 100644
--- a/editor/main_saturn.cpp
+++ b/editor/main_saturn.cpp
@@ -325,8 +325,8 @@ void main()
      2-word: value of bit 5-0 * 0x4000
   */
   vdp2.reg.MPOFN = MPOFN__N0MP(0); // bits 8~6
-  vdp2.reg.MPABN0 = MPABN0__N0MPB(0) | MPABN0__N0MPA(plane_a); // bits 5~0
-  vdp2.reg.MPCDN0 = MPABN0__N0MPD(0) | MPABN0__N0MPC(0); // bits 5~0
+  vdp2.reg.MPABN0 = MPABN0__N0MPB(plane_a) | MPABN0__N0MPA(plane_a); // bits 5~0
+  vdp2.reg.MPCDN0 = MPCDN0__N0MPD(plane_a) | MPCDN0__N0MPC(plane_a); // bits 5~0
 
   // zeroize character/cell data from 0 up to plane_a_offset
   fill<uint32_t>(&vdp2.vram.u32[(0 / 4)], 0, plane_offset(plane_a));
diff --git a/m68k/Makefile b/m68k/Makefile
index 0ccf28d..503b0a7 100644
--- a/m68k/Makefile
+++ b/m68k/Makefile
@@ -15,6 +15,14 @@ include $(LIB)/m68k/common.mk
 		synth 101s $* 441 vol -10dB
 	mv $@.raw $@
 
+# 88200 bytes
+%-44100-s16be-1ch-1sec.pcm: Makefile
+	sox \
+		-r 44100 -e signed-integer -b 16 -c 1 -n -B \
+		$@.raw \
+		synth 1 sin 440 vol -10dB
+	mv $@.raw $@
+
 %.pcm.o: %.pcm
 	$(BUILD_BINARY_O)
 
diff --git a/m68k/interrupt.cpp b/m68k/interrupt.cpp
index c43c7e9..c0a416d 100644
--- a/m68k/interrupt.cpp
+++ b/m68k/interrupt.cpp
@@ -4,7 +4,7 @@
 
 extern void * _jojo_start __asm("_binary_jojo_11025_s16be_1ch_pcm_start");
 
-static volatile int32_t frame = 0x0;
+static int32_t frame = 0x0;
 
 constexpr int32_t tactl = 7;
 constexpr int32_t frame_size = ((1 << tactl) * 256) / (44100 / 11025);
diff --git a/m68k/slot.cpp b/m68k/slot.cpp
index c798dcc..6b602ab 100644
--- a/m68k/slot.cpp
+++ b/m68k/slot.cpp
@@ -2,7 +2,7 @@
 
 #include "scsp.h"
 
-extern void * _sine_start __asm("_binary_sine_44100_s16be_1ch_pcm_start");
+extern void * _sine_start __asm("_binary_sine_44100_s16be_1ch_1sec_pcm_start");
 
 void main()
 {
diff --git a/raytracing/main-saturn.cpp b/raytracing/main-saturn.cpp
index 6698f5e..b546b52 100644
--- a/raytracing/main-saturn.cpp
+++ b/raytracing/main-saturn.cpp
@@ -4,7 +4,7 @@
 #include "smpc.h"
 #include "sh2.h"
 
-#include "vec.hpp"
+#include "vec3.hpp"
 #include "fp.hpp"
 #include "raytracing.hpp"
 
@@ -22,9 +22,9 @@ inline constexpr T rgb(const vec3& color)
 
   vec3 c = functor1(clamp, color) * fp16_16(channel_mask);
 
-  T red = static_cast<T>(c.r.value >> 16);
-  T green = static_cast<T>(c.g.value >> 16);
-  T blue = static_cast<T>(c.b.value >> 16);
+  T red = static_cast<T>(c.x.value >> 16);
+  T green = static_cast<T>(c.y.value >> 16);
+  T blue = static_cast<T>(c.z.value >> 16);
 
   return (1 << last_bit)
        | (blue  << (P * 2))
@@ -84,7 +84,8 @@ void start_slave()
   */
   sh2_vec[0x94] = (uint32_t)(&slave_main);
 
-  for (volatile int i = 0; i < 10; i++);
+  for (int i = 0; i < 10; i++)
+    asm volatile ("nop");
 
   smpc.reg.SF = 1;
   smpc.reg.COMREG = COMREG__SSHON;
@@ -92,7 +93,7 @@ void start_slave()
   while ((smpc.reg.SF & 0x01) == 1);
 }
 
-void main_asdf()
+void main()
 {
   // DISP: Please make sure to change this bit from 0 to 1 during V blank.
   vdp2.reg.TVMD = ( TVMD__DISP | TVMD__LSMD__NON_INTERLACE
@@ -131,10 +132,3 @@ void main_asdf()
 
   render(0, put_pixel);
 }
-
-extern "C"
-void start(void)
-{
-  main_asdf();
-  while (1) {}
-}
diff --git a/raytracing/raytracing.cpp b/raytracing/raytracing.cpp
index 8a600d9..1d29472 100644
--- a/raytracing/raytracing.cpp
+++ b/raytracing/raytracing.cpp
@@ -1,6 +1,6 @@
 #include <stdint.h>
 
-#include "vec.hpp"
+#include "vec3.hpp"
 #include "fp.hpp"
 #include "raytracing.hpp"
 
diff --git a/scsp/slot.cpp b/scsp/slot.cpp
index 900a477..8627dd7 100644
--- a/scsp/slot.cpp
+++ b/scsp/slot.cpp
@@ -33,10 +33,3 @@ void main()
 
   slot.LOOP |= LOOP__KYONEX;
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1);
-}
diff --git a/scsp/sound_cpu__interrupt.cpp b/scsp/sound_cpu__interrupt.cpp
index 33c8f86..e2d35ab 100644
--- a/scsp/sound_cpu__interrupt.cpp
+++ b/scsp/sound_cpu__interrupt.cpp
@@ -239,10 +239,3 @@ void main()
 
   init_sound();
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1);
-}
diff --git a/scsp/sound_cpu__slot.cpp b/scsp/sound_cpu__slot.cpp
index 0f3a772..605da9d 100644
--- a/scsp/sound_cpu__slot.cpp
+++ b/scsp/sound_cpu__slot.cpp
@@ -43,10 +43,3 @@ void main()
 
   // do nothing while the sound CPU manipulates the SCSP
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1);
-}
diff --git a/smpc/input_intback.cpp b/smpc/input_intback.cpp
index 114e64b..ce5ff8c 100644
--- a/smpc/input_intback.cpp
+++ b/smpc/input_intback.cpp
@@ -373,10 +373,3 @@ void main()
   scu.reg.IST = 0;
   scu.reg.IMS &= ~(IMS__SMPC);
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1);
-}
diff --git a/smpc/input_keyboard.cpp b/smpc/input_keyboard.cpp
index 8f94d27..b1d68e8 100644
--- a/smpc/input_keyboard.cpp
+++ b/smpc/input_keyboard.cpp
@@ -462,10 +462,3 @@ void main()
   scu.reg.IST = 0;
   scu.reg.IMS = ~(IMS__SMPC | IMS__V_BLANK_IN);
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1);
-}
diff --git a/vdp1/kana.cpp b/vdp1/kana.cpp
index ecd9fa9..7f61cbc 100644
--- a/vdp1/kana.cpp
+++ b/vdp1/kana.cpp
@@ -204,10 +204,3 @@ void main()
   // start drawing (execute the command list) on every frame
   vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE;
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1) {}
-}
diff --git a/vdp1/normal_sprite.cpp b/vdp1/normal_sprite.cpp
index e0c2646..76000f3 100644
--- a/vdp1/normal_sprite.cpp
+++ b/vdp1/normal_sprite.cpp
@@ -150,10 +150,3 @@ void main()
   // start drawing (execute the command list) on every frame
   vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE;
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1) {}
-}
diff --git a/vdp1/normal_sprite_animated.cpp b/vdp1/normal_sprite_animated.cpp
index 6ed7b05..9009b93 100644
--- a/vdp1/normal_sprite_animated.cpp
+++ b/vdp1/normal_sprite_animated.cpp
@@ -193,10 +193,3 @@ void main()
   scu.reg.IST = 0;
   scu.reg.IMS = ~(IMS__V_BLANK_IN);
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1) {}
-}
diff --git a/vdp1/normal_sprite_color_bank.cpp b/vdp1/normal_sprite_color_bank.cpp
index ef4663f..0daf77e 100644
--- a/vdp1/normal_sprite_color_bank.cpp
+++ b/vdp1/normal_sprite_color_bank.cpp
@@ -146,10 +146,3 @@ void main()
   // start drawing (execute the command list) on every frame
   vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE;
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1) {}
-}
diff --git a/vdp1/polygon.cpp b/vdp1/polygon.cpp
index ff59eb5..86ccae6 100644
--- a/vdp1/polygon.cpp
+++ b/vdp1/polygon.cpp
@@ -73,10 +73,3 @@ void main()
   // start drawing (execute the command list) on every frame
   vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE;
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1) {}
-}
diff --git a/vdp1/rgb.cpp b/vdp1/rgb.cpp
index c0529b1..4ffdc49 100644
--- a/vdp1/rgb.cpp
+++ b/vdp1/rgb.cpp
@@ -103,10 +103,3 @@ void main()
   // start drawing (execute the command list) on every frame
   vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE;
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1) {}
-}
diff --git a/vdp2/nbg0.cpp b/vdp2/nbg0.cpp
index 21f560e..8969d19 100644
--- a/vdp2/nbg0.cpp
+++ b/vdp2/nbg0.cpp
@@ -12,7 +12,7 @@
 #include <stdint.h>
 
 #include "vdp2.h"
-#include "../common/vdp2_func.h"
+#include "../common/vdp2_func.hpp"
 
 extern void * _butterfly_data_pal_start __asm("_binary_res_butterfly_data_pal_start");
 extern void * _butterfly_data_pal_size __asm("_binary_res_butterfly_data_pal_size");
@@ -107,8 +107,8 @@ void main()
   constexpr int plane_size = page_size * 1;
 
   vdp2.reg.MPOFN = MPOFN__N0MP(0); // bits 8~6
-  vdp2.reg.MPABN0 = MPABN0__N0MPB(0) | MPABN0__N0MPA(plane_a); // bits 5~0
-  vdp2.reg.MPCDN0 = MPABN0__N0MPD(0) | MPABN0__N0MPC(0); // bits 5~0
+  vdp2.reg.MPABN0 = MPABN0__N0MPB(plane_a) | MPABN0__N0MPA(plane_a); // bits 5~0
+  vdp2.reg.MPCDN0 = MPCDN0__N0MPD(plane_a) | MPCDN0__N0MPC(plane_a); // bits 5~0
 
   constexpr int cell_size = (8 * 8) * 2; // N0CHCN__2048_COLOR (16-bit)
   constexpr int character_size = cell_size * (1 * 1); // N0CHSZ__1x1_CELL
diff --git a/wordle/main_saturn.cpp b/wordle/main_saturn.cpp
index 5952c7b..c0babbc 100644
--- a/wordle/main_saturn.cpp
+++ b/wordle/main_saturn.cpp
@@ -248,10 +248,3 @@ void main()
   scu.reg.IST = 0;
   scu.reg.IMS = ~(IMS__SMPC | IMS__V_BLANK_IN);
 }
-
-extern "C"
-void start(void)
-{
-  main();
-  while (1);
-}