--- nono/vm/scc.h	2026/04/29 17:04:28	1.1
+++ nono/vm/scc.h	2026/04/29 17:04:59	1.1.1.7
@@ -1,6 +1,7 @@
 //
 // nono
-// Copyright (C) 2017 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
 //
 
 #pragma once
@@ -8,28 +9,33 @@
 #include "device.h"
 #include "upd7201.h"
 
-class SCCDevice
-	: public uPD7201Device
+class SCCDevice : public uPD7201Device
 {
-	typedef uPD7201Device inherited;
+	using inherited = uPD7201Device;
  private:
 	static const int baseaddr = 0xe98000;
 
  public:
 	SCCDevice();
-	virtual ~SCCDevice();
+	virtual ~SCCDevice() override;
 
-	virtual void ResetHard();
+	// XXX 親の同名メソッドと名前分けたほうがいいか
+	uint8 ReadCtrl(struct SIO::channel *chan) override;
+	void WriteCtrl(struct SIO::channel *chan, uint32 data) override;
 
-	virtual uint64 Read8(uint32 addr);
-	virtual uint64 Read16(uint32 addr);
-	virtual uint64 Write8(uint32 addr, uint32 data);
-	virtual uint64 Write16(uint32 addr, uint32 data);
-	virtual uint64 Peek8(uint32 addr);
+	// 割り込みアクノリッジ
+	int InterruptAcknowledge();
 
-	// XXX 親の同名メソッドと名前分けたほうがいいか
-	virtual uint8 ReadCtrl(struct SIO::channel *chan);
-	virtual void WriteCtrl(struct SIO::channel *chan, uint32 data);
+ protected:
+	// BusIO インタフェース
+	static const uint32 NPORT = 4;
+	uint64 Read(uint32 offset);
+	uint64 Write(uint32 offset, uint32 data);
+	uint64 Peek(uint32 offset);
 
-	virtual void Interrupt();
+ private:
+	void Interrupt() override;
+	void WriteCR5(struct SIO::channel *chan, uint32 data) override;
 };
+
+extern std::unique_ptr<SCCDevice> gSCC;