--- nono/vm/scc.h	2026/04/29 17:04:32	1.1.1.2
+++ nono/vm/scc.h	2026/04/29 17:04:50	1.1.1.5
@@ -1,6 +1,7 @@
 //
 // nono
-// Copyright (C) 2017 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
 //
 
 #pragma once
@@ -11,31 +12,30 @@
 class SCCDevice
 	: public uPD7201Device
 {
-	typedef uPD7201Device inherited;
+	using inherited = uPD7201Device;
  private:
 	static const int baseaddr = 0xe98000;
 
  public:
 	SCCDevice();
-	virtual ~SCCDevice();
-
-	virtual void ResetHard();
-
-	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);
+	virtual ~SCCDevice() override;
 
 	// 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);
+	uint8 ReadCtrl(struct SIO::channel *chan) override;
+	void WriteCtrl(struct SIO::channel *chan, uint32 data) override;
+
+	// 割り込みアクノリッジ
+	int InterruptAcknowledge();
 
-	virtual void Interrupt();
+ 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);
 
  private:
-	// アドレスデコーダ
-	uint64 Decoder(uint32 addr) const;
+	void Interrupt() override;
 };
 
 extern std::unique_ptr<SCCDevice> gSCC;