--- nono/vm/crtc.h	2026/04/29 17:05:24	1.1.1.10
+++ nono/vm/crtc.h	2026/04/29 17:05:28	1.1.1.11
@@ -81,7 +81,10 @@ struct CRTC
 	//     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
 	// R23 |                          マスクパターン                       |
 	//     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
-	// R24 |                       -                       |RC | 0 |FC |VI |
+	//
+	//      15  14  13  12  11  10   9   8   7   6   5   4   3   2   1   0
+	//     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
+	// OP  |                       -                       |RC | 0 |FC |VI |
 	//     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
 
 	uint16 r[24];
@@ -138,15 +141,15 @@ class CRTCDevice : public IODevice
 	bool Init() override;
 	void ResetHard(bool poweron) override;
 
-	busdata Read8(uint32 offset) override;
-	busdata Read16(uint32 offset) override;
-	busdata Write8(uint32 offset, uint32 data) override;
-	busdata Write16(uint32 offset, uint32 data) override;
-	busdata Peek8(uint32 offset) override;
+	busdata Read(busaddr addr) override;
+	busdata Write(busaddr addr, uint32 data) override;
+	busdata Peek1(uint32 offset) override;
 
  private:
+	static inline uint32 Decoder(uint32 addr);
+
 	// ワード読み出し
-	busdata Peek16(uint32 addr) const;
+	busdata Peek2(uint32 addr) const;
 	// レジスタへの書き込み
 	void SetReg(uint32 offset, uint32 data);
 	// 動作ポートへの書き込み