--- nono/vm/sio.h	2026/04/29 17:04:29	1.1.1.2
+++ nono/vm/sio.h	2026/04/29 17:05:17	1.1.1.10
@@ -1,30 +1,82 @@
 //
 // nono
-// Copyright (C) 2018 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
+//
+
+//
+// SIO (uPD7201)
 //
 
 #pragma once
 
 #include "device.h"
-#include "upd7201.h"
+#include "mpscc.h"
+
+class Keyboard;
 
-class SIODevice
-	: public uPD7201Device
+class SIODevice : public MPSCCDevice
 {
-	typedef uPD7201Device inherited;
+	using inherited = MPSCCDevice;
  public:
 	SIODevice();
-	virtual ~SIODevice();
+	virtual ~SIODevice() override;
 
-	virtual void ResetHard();
+	bool Init() override;
+	void ResetHard(bool poweron) override;
 
-	virtual uint64 Read8(uint32);
-	virtual uint64 Read16(uint32);
-	virtual uint64 Write8(uint32, uint32);
-	virtual uint64 Write16(uint32, uint32);
+	// BusIO インタフェース
+	// (内蔵 ROM からのアクセス用に特別に public にしてある)
+	uint64 Read(uint32 offset);
+	uint64 Write(uint32 offset, uint32 data);
+
+ protected:
+	// BusIO インタフェース
+	static const uint32 NPORT = 4;
+	uint64 Peek(uint32 offset);
+
+	void Tx(int ch, uint32 data) override;
+	uint GetHighestInt() const override;
 
  private:
-	virtual void Interrupt();
+	// 指定のレジスタ名を返す
+	const char *CRName(const MPSCCChan&, int n) const override;
+	const char *SRName(const MPSCCChan&, int n) const override;
+	// 現在のレジスタ名を返す
+	const char *CRName(const MPSCCChan& chan) const {
+		return CRName(chan, chan.ptr);
+	}
+	const char *SRName(const MPSCCChan& chan) const {
+		return SRName(chan, chan.ptr);
+	}
+
+	void ResetChannel(MPSCCChan&);
+
+	uint8 ReadCtrl(MPSCCChan&);
+	void WriteCtrl(MPSCCChan&, uint32 data);
+	uint8 PeekCtrl(const MPSCCChan&) const;
+
+	uint8 GetCR1(const MPSCCChan&) const;
+	uint8 GetCR2A() const;
+	uint8 GetCR2B() const;
+	uint8 GetSR0(const MPSCCChan&) const;
+
+	void WriteCR0(MPSCCChan&, uint32 data);
+	void WriteCR1(MPSCCChan&, uint32 data);
+	void WriteCR2(MPSCCChan&, uint32 data);
+
+	// VIS モードを更新
+	void SetVIS();
+
+	DECLARE_MONITOR_CALLBACK(MonitorUpdate);
+	void MonitorUpdateCh(TextScreen&, int ch, int xbase, int ybase);
+
+	Keyboard *keyboard {};
+
+	static const char * const crnames[16];
+	static const char * const srnames[16];
 };
 
-extern SIODevice *gSIO;
+static inline SIODevice *GetSIODevice() {
+	return Object::GetObject<SIODevice>(OBJ_MPSCC);
+}