--- nono/vm/dmac.h	2026/04/29 17:04:32	1.1.1.2
+++ nono/vm/dmac.h	2026/04/29 17:04:44	1.1.1.6
@@ -1,6 +1,7 @@
 //
 // nono
-// Copyright (C) 2017 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
 //
 
 #pragma once
@@ -115,6 +116,10 @@ struct DMAC
 		bool active;		// ACT
 		bool pcl;			// PCL の状態 (High が true)
 		bool prev_pcl;		// 前回の PCL の状態 (High が true)
+		bool IsINTR() const {	// CSR の割り込み要因が立っていれば true
+			// XXX PCT は未対応
+			return (csr & (CSR_COC | CSR_BTC | CSR_NDT | CSR_ERR));
+		}
 
 		uint8 cer;
 		uint8 dcr;
@@ -137,7 +142,6 @@ struct DMAC
 		uint32 GetDAC()   const { return (scr & 3); }
 
 		uint8 ccr;
-		bool int_enable;	// INT: 割り込み許可なら true
 
 		uint16 mtc;
 		uint32 mar;
@@ -153,13 +157,10 @@ struct DMAC
 
 		uint8 PeekCSR() const;
 		void WriteCSR(uint32 data);
-		uint8 PeekCCR() const;
 		void WriteCCR(uint32 data);
 
 		// 転送開始
 		void StartTransfer();
-		// 割り込み
-		void SetINT(uint32 val);
 	} chan[4];
 
 	// 全体
@@ -169,28 +170,40 @@ struct DMAC
 class DMACDevice
 	: public IODevice
 {
-	typedef IODevice inherited;
+	using inherited = IODevice;
 
 	static const int baseaddr = 0xe84000;
 
  public:
 	DMACDevice();
-	virtual ~DMACDevice();
+	virtual ~DMACDevice() override;
 
-	virtual uint64 Read8(uint32 addr);
-	virtual uint64 Write8(uint32 addr, uint32 data);
-	virtual uint64 Peek8(uint32 addr);
-
-	virtual bool MonitorUpdate();
+	void ResetHard() override;
+	void MonitorUpdate(TextScreen&) override;
 
 	// 転送
+	void StartTransfer(DMAC::Channel *chan);
 	void AbortTransfer(DMAC::Channel *chan);
-	void Transfer(int arg);
+	void Transfer(Event& ev);
 	int64 TransferM8toD8(DMAC::Channel *chan);
 	int64 TransferD8toM8(DMAC::Channel *chan);
 
+	// 割り込みアクノリッジ
+	int InterruptAcknowledge();
+
+ protected:
+	// BusIO インタフェース
+	static const uint NPORT = 256;
+	uint64 Read(uint32 addr);
+	uint64 Write(uint32 addr, uint32 data);
+	uint64 Peek(uint32 addr);
+
  private:
-	void MonitorReg4(int x, int y, uint32 reg, const char * const *names);
+	void MonitorReg4(TextScreen&,
+		int x, int y, uint32 reg, const char * const *names);
+
+	// 割り込み信号線の状態を変更
+	void ChangeInterrupt();
 
 	struct DMAC dmac {};
 	Event event[4] {};