diff --git a/sh2.h b/sh2.h
index 299093f..6ebbdaa 100644
--- a/sh2.h
+++ b/sh2.h
@@ -193,3 +193,15 @@ enum tocr_bits {
 // enum vcrd_bits {
 #define VCRD__FOVV(n) (n << 8)
 // };
+
+enum ccr_bits {
+  CCR__W__WAY0 = (0b00 << 6),
+  CCR__W__WAY1 = (0b01 << 6),
+  CCR__W__WAY2 = (0b10 << 6),
+  CCR__W__WAY3 = (0b11 << 6),
+  CCR__CP__CACHE_PURGE = (0b1 << 4),
+  CCR__TW__TWO_WAY_MODE = (0b1 << 3),
+  CCR__OD__DATA_REPLACEMENT_DISABLE = (0b1 << 2),
+  CCR__ID__INSTRUCTION_REPLACEMENT_DISABLE = (0b1 << 1),
+  CCR__CE__CACHE_ENABLE = (0b1 << 0),
+};
diff --git a/vdp1.h b/vdp1.h
index 2d72fc8..be3fef3 100644
--- a/vdp1.h
+++ b/vdp1.h
@@ -35,7 +35,7 @@ typedef struct vdp1_cmd {
     };
     cmd_point point[4];
   };
-  u16 GDRA;
+  u16 GRDA;
   u16 _dummy;
 } vdp1_cmd;
 
@@ -99,7 +99,9 @@ enum pmod_bit {
 #define PMOD__COLOR_MODE__COLOR_BANK_256  (0b100 << 3)
 #define PMOD__COLOR_MODE__RGB             (0b101 << 3)
 
-#define PMOD__COLOR_CALCULATION ( << 0)
+#define PMOD__COLOR_CALCULATION__GOURAUD_SHADING (0b100 << 0)
+#define PMOD__COLOR_CALCULATION__HALF_ORIGINAL_GRAPHIC (0b010 << 0)
+#define PMOD__COLOR_CALCULATION__HALF_BACKGROUND (0b001 << 0)
 };
 
 // see "Pixel Data in Frame Buffer" in VDP1 manual