--- nono/vm/printer.h	2026/04/29 17:04:28	1.1
+++ nono/vm/printer.h	2026/04/29 17:04:50	1.1.1.4
@@ -1,6 +1,7 @@
 //
 // nono
-// Copyright (C) 2017 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
 //
 
 #pragma once
@@ -10,17 +11,19 @@
 class PrinterDevice
 	: public IODevice
 {
-	typedef IODevice inherited;
+	using inherited = IODevice;
  private:
 	static const int baseaddr = 0xe8c000;
 
  public:
 	PrinterDevice();
-	virtual ~PrinterDevice();
+	virtual ~PrinterDevice() 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);
+	uint64 Read8(uint32 addr) override;
+	uint64 Read16(uint32 addr) override;
+	uint64 Write8(uint32 addr, uint32 data) override;
+	uint64 Write16(uint32 addr, uint32 data) override;
+	uint64 Peek8(uint32 addr) override;
 };
+
+extern std::unique_ptr<PrinterDevice> gPrinter;