diff --git a/Makefile b/Makefile
index c531058..998d09c 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ ALL += scsp/sound_cpu__slot.cue
 ALL += scsp/sound_cpu__interrupt.cue
 ALL += scsp/sound_cpu__midi_debug.cue
 ALL += editor/main_saturn.cue
+ALL += cdc/cdc.cue
 
 all: $(ALL)
 
@@ -150,6 +151,8 @@ editor/main_saturn.o: common/keyboard.hpp editor/editor.hpp
 
 editor/main_saturn.elf: editor/main_saturn.o res/nec.bitmap.bin.o res/nec_bold.bitmap.bin.o sh/lib1funcs.o common/keyboard.o saturn/start.o
 
+cdc/cdc.elf: cdc/cdc.o saturn/start.o memcpy.o cdc/serial.o
+
 # clean
 clean: clean-sh
 clean-sh:
diff --git a/vdp2/color_calculation_ratio.cpp b/vdp2/color_calculation_ratio.cpp
index 1c8ed14..f394509 100644
--- a/vdp2/color_calculation_ratio.cpp
+++ b/vdp2/color_calculation_ratio.cpp
@@ -280,9 +280,6 @@ void main()
   // both transparency and end codes are enabled, it seems there are only 14
   // usable colors in the 4-bit color mode.
   vdp1.vram.cmd[2].PMOD = PMOD__ECD | PMOD__COLOR_MODE__COLOR_BANK_16;
-  // It appears Kronos does not correctly calculate the color address in the
-  // VDP1 debugger. Kronos will report FFFC when the actual color table address
-  // in this example is 7FFE0.
   vdp1.vram.cmd[2].COLR = COLR__COLOR_BANK__TYPE0__PR(0)
                         | 0;
   vdp1.vram.cmd[2].SRCA = mai_character_address >> 3;
@@ -296,9 +293,6 @@ void main()
   // both transparency and end codes are enabled, it seems there are only 14
   // usable colors in the 4-bit color mode.
   vdp1.vram.cmd[3].PMOD = PMOD__ECD | PMOD__COLOR_MODE__COLOR_BANK_16;
-  // It appears Kronos does not correctly calculate the color address in the
-  // VDP1 debugger. Kronos will report FFFC when the actual color table address
-  // in this example is 7FFE0.
   vdp1.vram.cmd[3].COLR = COLR__COLOR_BANK__TYPE0__PR(1)
                         | 32;
   vdp1.vram.cmd[3].SRCA = haohmaru_character_address >> 3;