--- nono/vm/crtc.h	2026/04/29 17:05:10	1.1.1.7
+++ nono/vm/crtc.h	2026/04/29 17:05:14	1.1.1.8
@@ -68,7 +68,7 @@ struct CRTC
 	//
 	//      15  14  13  12  11  10   9   8   7   6   5   4   3   2   1   0
 	//     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
-	// R20 |         -         |SIZ|  COL  |     -     |HF |  VD   |   HD  |
+	// R20 |       -       |MEM|SIZ|  COL  |     -     |HF |  VD   |   HD  |
 	//     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
 	// R21 |           -           |MEN|SA |       AP      |       CP      |
 	//     +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
@@ -109,6 +109,14 @@ struct CRTC
 	static const uint32 REG_END	= 0x18;
 	static const uint32 REG_OP	= 0x240;	// $E80480
 
+	// R20
+	static const uint16 R20_MEM	= 0x0800;
+	static const uint16 R20_SIZ	= 0x0400;
+	static const uint16 R20_COL	= 0x0300;
+	static const uint16 R20_HF	= 0x0010;
+	static const uint16 R20_VD	= 0x000c;
+	static const uint16 R20_HD	= 0x0003;
+
 	// 動作ポート
 	static const uint32 OP_RC	= 0x08;		// ラスターコピー開始(%1)
 	static const uint32 OP_FC	= 0x02;		// 高速クリア開始(%1)
@@ -137,12 +145,12 @@ class CRTCDevice : public IODevice
 	// 動作ポートへの書き込み
 	void WriteOp(uint32 data);
 
-	// テキスト画面のラスターコピー
-	void StartRasterCopy();
-
 	// 水平同期信号イベント
 	void HSyncCallback(Event& ev);
 
+	// ラスターコピー完了イベント
+	void RasterCallback(Event& ev);
+
 	// 垂直表示期間イベント
 	void VDispCallback(Event& ev);
 
@@ -150,8 +158,12 @@ class CRTCDevice : public IODevice
 
 	struct CRTC crtc {};
 
+	// ラスターコピー指示
+	bool raster_copy {};
+
 	Event hsync_event { this };
 	Event vdisp_event { this };
+	Event raster_event { this };
 
 	Monitor monitor { this };
 };