Revert "remove const (nw)"

This reverts commit e96fd34dd8.

src/devices/cpu/8x300/8x300.cpp

@@ -145,7 +145,7 @@ void n8x300_cpu_device::device_start()
 	m_icountptr = &m_icount;
 }
 
-void n8x300_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void n8x300_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/8x300/8x300.h

@@ -66,7 +66,7 @@ protected:
 	}
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 2; }

src/devices/cpu/adsp2100/adsp2100.cpp

@@ -719,7 +719,7 @@ void adsp21xx_device::state_import(const device_state_entry &entry)
 //  for the debugger
 //-------------------------------------------------
 
-void adsp21xx_device::state_string_export(const device_state_entry &entry, std::string &str)
+void adsp21xx_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/adsp2100/adsp2100.h

@@ -237,7 +237,7 @@ protected:
 
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override;

src/devices/cpu/alph8201/alph8201.cpp

@@ -527,7 +527,7 @@ void alpha8201_cpu_device::state_export(const device_state_entry &entry)
 }
 
 
-void alpha8201_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void alpha8201_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/alph8201/alph8201.h

@@ -75,7 +75,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/alto2/alto2cpu.cpp

@@ -1002,7 +1002,7 @@ void alto2_cpu_device::device_start()
 //  for the debugger
 //-------------------------------------------------
 
-void alto2_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void alto2_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/alto2/alto2cpu.h

@@ -213,7 +213,7 @@ protected:
 	//! device (P)ROMs
 	virtual const rom_entry *device_rom_region() const override;
 	//! device_state_interface overrides
-	void state_string_export(const device_state_entry &entry, std::string &str) override;
+	void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	//! device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 4; }

src/devices/cpu/am29000/am29000.cpp

@@ -404,7 +404,7 @@ void am29000_cpu_device::device_start()
 }
 
 
-void am29000_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void am29000_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/am29000/am29000.h

@@ -462,7 +462,7 @@ protected:
 	}
 
 	// device_state_interface overrides
-	void state_string_export(const device_state_entry &entry, std::string &str) override;
+	void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 4; }

src/devices/cpu/amis2000/amis2000.cpp

@@ -70,7 +70,7 @@ amis2152_cpu_device::amis2152_cpu_device(const machine_config &mconfig, const ch
 
 
 // disasm
-void amis2000_base_device::state_string_export(const device_state_entry &entry, std::string &str)
+void amis2000_base_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/amis2000/amis2000.h

@@ -89,7 +89,7 @@ protected:
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }
 	virtual UINT32 disasm_max_opcode_bytes() const override { return 1; }
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	address_space_config m_program_config;
 	address_space_config m_data_config;

src/devices/cpu/apexc/apexc.cpp

@@ -814,7 +814,7 @@ void apexc_cpu_device::state_export(const device_state_entry &entry)
 }
 
 
-void apexc_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void apexc_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/apexc/apexc.h

@@ -44,7 +44,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 4; }

src/devices/cpu/arm/arm.cpp

@@ -552,7 +552,7 @@ void arm_cpu_device::device_start()
 }
 
 
-void arm_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void arm_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	static const char *s[4] = { "USER", "FIRQ", "IRQ ", "SVC " };
 

src/devices/cpu/arm/arm.h

@@ -61,7 +61,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : nullptr; }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 4; }

src/devices/cpu/arm7/arm7.cpp

@@ -564,7 +564,7 @@ void arm7_cpu_device::state_export(const device_state_entry &entry)
 }
 
 
-void arm7_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void arm7_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/arm7/arm7.h

@@ -71,7 +71,7 @@ protected:
 
 	// device_state_interface overrides
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 2; }

src/devices/cpu/asap/asap.cpp

@@ -280,7 +280,7 @@ void asap_device::state_export(const device_state_entry &entry)
 //  for the debugger
 //-------------------------------------------------
 
-void asap_device::state_string_export(const device_state_entry &entry, std::string &str)
+void asap_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/asap/asap.h

@@ -48,7 +48,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override;

src/devices/cpu/avr8/avr8.cpp

@@ -905,7 +905,7 @@ const address_space_config *avr8_device::memory_space_config(address_spacenum sp
 //  for the debugger
 //-------------------------------------------------
 
-void avr8_device::state_string_export(const device_state_entry &entry, std::string &str)
+void avr8_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/avr8/avr8.h

@@ -131,7 +131,7 @@ protected:
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// address spaces
 	const address_space_config m_program_config;

src/devices/cpu/ccpu/ccpu.cpp

@@ -139,7 +139,7 @@ void ccpu_cpu_device::device_start()
 }
 
 
-void ccpu_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void ccpu_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/ccpu/ccpu.h

@@ -82,7 +82,7 @@ protected:
 	}
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/cop400/cop400.cpp

@@ -1205,7 +1205,7 @@ void cop400_cpu_device::state_export(const device_state_entry &entry)
 	}
 }
 
-void cop400_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void cop400_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/cop400/cop400.h

@@ -170,7 +170,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/cosmac/cosmac.cpp

@@ -468,7 +468,7 @@ void cosmac_device::state_export(const device_state_entry &entry)
 //  for the debugger
 //-------------------------------------------------
 
-void cosmac_device::state_string_export(const device_state_entry &entry, std::string &str)
+void cosmac_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/cosmac/cosmac.h

@@ -232,7 +232,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override;

src/devices/cpu/cp1610/cp1610.cpp

@@ -3401,7 +3401,7 @@ cp1610_cpu_device::cp1610_cpu_device(const machine_config &mconfig, const char *
 }
 
 
-void cp1610_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void cp1610_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/cp1610/cp1610.h

@@ -56,7 +56,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : nullptr; }
 
 	// device_state_interface overrides
-	void state_string_export(const device_state_entry &entry, std::string &str) override;
+	void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 2; }

src/devices/cpu/cubeqcpu/cubeqcpu.cpp

@@ -347,7 +347,7 @@ void cquestrot_cpu_device::device_reset()
 }
 
 
-void cquestrot_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void cquestrot_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{
@@ -471,7 +471,7 @@ void cquestlin_cpu_device::device_reset()
 }
 
 
-void cquestlin_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void cquestlin_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/cubeqcpu/cubeqcpu.h

@@ -232,7 +232,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : nullptr; }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 8; }
@@ -316,7 +316,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : nullptr; }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 8; }

src/devices/cpu/dsp16/dsp16.cpp

@@ -214,7 +214,7 @@ const address_space_config *dsp16_device::memory_space_config(address_spacenum s
 //  for the debugger
 //-------------------------------------------------
 
-void dsp16_device::state_string_export(const device_state_entry &entry, std::string &str)
+void dsp16_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/dsp16/dsp16.h

@@ -46,7 +46,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override;
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override;

src/devices/cpu/dsp32/dsp32.cpp

@@ -368,7 +368,7 @@ void dsp32c_device::state_export(const device_state_entry &entry)
 //  for the debugger
 //-------------------------------------------------
 
-void dsp32c_device::state_string_export(const device_state_entry &entry, std::string &str)
+void dsp32c_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/dsp32/dsp32.h

@@ -123,7 +123,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override;

src/devices/cpu/dsp56k/dsp56k.cpp

@@ -340,7 +340,7 @@ void dsp56k_device::device_start()
 }
 
 
-void dsp56k_device::state_string_export(const device_state_entry &entry, std::string &str)
+void dsp56k_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	const dsp56k_core *cpustate = &m_dsp56k_core;
 

src/devices/cpu/dsp56k/dsp56k.h

@@ -231,7 +231,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : ((spacenum == AS_DATA) ? &m_data_config : nullptr ); }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 2; }

src/devices/cpu/e0c6200/e0c6200.cpp

@@ -25,7 +25,7 @@
 
 
 // disasm
-void e0c6200_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void e0c6200_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/e0c6200/e0c6200.h

@@ -44,7 +44,7 @@ protected:
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 2; }
 	virtual UINT32 disasm_max_opcode_bytes() const override { return 2; }
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	address_space_config m_program_config;
 	address_space_config m_data_config;

src/devices/cpu/e132xs/e132xs.cpp

@@ -1848,7 +1848,7 @@ const address_space_config *hyperstone_device::memory_space_config(address_space
 //  for the debugger
 //-------------------------------------------------
 
-void hyperstone_device::state_string_export(const device_state_entry &entry, std::string &str)
+void hyperstone_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/e132xs/e132xs.h

@@ -241,7 +241,7 @@ protected:
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// address spaces
 	const address_space_config m_program_config;

src/devices/cpu/esrip/esrip.cpp

@@ -350,7 +350,7 @@ const address_space_config *esrip_device::memory_space_config(address_spacenum s
 //  for the debugger
 //-------------------------------------------------
 
-void esrip_device::state_string_export(const device_state_entry &entry, std::string &str)
+void esrip_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/esrip/esrip.h

@@ -152,7 +152,7 @@ protected:
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// address spaces
 	const address_space_config m_program_config;

src/devices/cpu/f8/f8.cpp

@@ -2045,7 +2045,7 @@ void f8_cpu_device::device_start()
 }
 
 
-void f8_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void f8_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/f8/f8.h

@@ -51,7 +51,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : ( (spacenum == AS_IO) ? &m_io_config : nullptr ); }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/g65816/g65816.cpp

@@ -952,7 +952,7 @@ void g65816_device::state_export(const device_state_entry &entry)
 	}
 }
 
-void g65816_device::state_string_export(const device_state_entry &entry, std::string &str)
+void g65816_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/g65816/g65816.h

@@ -82,7 +82,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/h6280/h6280.cpp

@@ -2191,7 +2191,7 @@ OP(op,ff) { h6280_cycles(4); bbs(7, rd_zpg());         } // 6/8 BBS7 ZPG,REL
 //  for the debugger
 //-------------------------------------------------
 
-void h6280_device::state_string_export(const device_state_entry &entry, std::string &str)
+void h6280_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/h6280/h6280.h

@@ -98,7 +98,7 @@ protected:
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// opcode accessors
 	UINT8 program_read8(offs_t addr);

src/devices/cpu/h8/h8.cpp

@@ -216,7 +216,7 @@ void h8_device::state_export(const device_state_entry &entry)
 {
 }
 
-void h8_device::state_string_export(const device_state_entry &entry, std::string &str)
+void h8_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch(entry.index()) {
 	case STATE_GENFLAGS:

src/devices/cpu/h8/h8.h

@@ -157,7 +157,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override;

src/devices/cpu/hcd62121/hcd62121.cpp

@@ -363,7 +363,7 @@ void hcd62121_cpu_device::device_start()
 }
 
 
-void hcd62121_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void hcd62121_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/hcd62121/hcd62121.h

@@ -54,7 +54,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : ( (spacenum == AS_IO) ? &m_io_config : nullptr ); }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/hd61700/hd61700.cpp

@@ -270,7 +270,7 @@ void hd61700_cpu_device::state_import(const device_state_entry &entry)
 //  for the debugger
 //-------------------------------------------------
 
-void hd61700_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void hd61700_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/hd61700/hd61700.h

@@ -92,7 +92,7 @@ protected:
 
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
-	void state_string_export(const device_state_entry &entry, std::string &str) override;
+	void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_memory_interface overrides
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : nullptr; }

src/devices/cpu/hmcs40/hmcs40.cpp

@@ -133,7 +133,7 @@ hd44828_device::hd44828_device(const machine_config &mconfig, const char *tag, d
 
 
 // disasm
-void hmcs40_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void hmcs40_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/hmcs40/hmcs40.h

@@ -175,7 +175,7 @@ protected:
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 2; }
 	virtual UINT32 disasm_max_opcode_bytes() const override { return 2; }
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	address_space_config m_program_config;
 	address_space_config m_data_config;

src/devices/cpu/hphybrid/hphybrid.cpp

@@ -616,7 +616,7 @@ UINT16 hp_hybrid_cpu_device::execute_one_sub(UINT16 opcode)
 				return m_reg_P + 1;
 }
 
-void hp_hybrid_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void hp_hybrid_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	if (entry.index() == STATE_GENFLAGS) {
 		strprintf(str, "%s %s %c %c",

src/devices/cpu/hphybrid/hphybrid.h

@@ -112,7 +112,7 @@ protected:
                 virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : ( (spacenum == AS_IO) ? &m_io_config : NULL ); }
 
                 // device_state_interface overrides
-                void state_string_export(const device_state_entry &entry, std::string &str) override;
+                void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
                 // device_disasm_interface overrides
                 virtual UINT32 disasm_min_opcode_bytes() const override { return 2; }

src/devices/cpu/i386/i386.cpp

@@ -3465,7 +3465,7 @@ void i386_device::state_export(const device_state_entry &entry)
 	}
 }
 
-void i386_device::state_string_export(const device_state_entry &entry, std::string &str)
+void i386_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/i386/i386.h

@@ -59,7 +59,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/i4004/i4004.cpp

@@ -506,7 +506,7 @@ void i4004_cpu_device::state_export(const device_state_entry &entry)
 	}
 }
 
-void i4004_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void i4004_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/i4004/i4004.h

@@ -57,7 +57,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/i8008/i8008.cpp

@@ -186,7 +186,7 @@ void i8008_device::state_export(const device_state_entry &entry)
 //  for the debugger
 //-------------------------------------------------
 
-void i8008_device::state_string_export(const device_state_entry &entry, std::string &str)
+void i8008_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/i8008/i8008.h

@@ -48,7 +48,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 
 	// device_disasm_interface overrides

src/devices/cpu/i8085/i8085.cpp

@@ -1048,7 +1048,7 @@ void i8085a_cpu_device::state_export(const device_state_entry &entry)
 	}
 }
 
-void i8085a_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void i8085a_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/i8085/i8085.h

@@ -85,7 +85,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : ( (spacenum == AS_IO) ? &m_io_config : nullptr ); }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 	virtual void state_export(const device_state_entry &entry) override;
 	virtual void state_import(const device_state_entry &entry) override;
 

src/devices/cpu/i8089/i8089.cpp

@@ -158,7 +158,7 @@ offs_t i8089_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *op
 //  for the debugger
 //-------------------------------------------------
 
-void i8089_device::state_string_export(const device_state_entry &entry, std::string &str)
+void i8089_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	const i8089_channel *ch = m_ch1;
 

src/devices/cpu/i8089/i8089.h

@@ -88,7 +88,7 @@ protected:
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// optional information overrides
 	virtual machine_config_constructor device_mconfig_additions() const override;

src/devices/cpu/i86/i286.cpp

@@ -277,7 +277,7 @@ void i80286_cpu_device::device_start()
 	m_out_shutdown_func.resolve_safe();
 }
 
-void i80286_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void i80286_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/i86/i286.h

@@ -77,7 +77,7 @@ protected:
 	virtual void execute_run() override;
 	virtual void device_reset() override;
 	virtual void device_start() override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 	virtual UINT32 execute_input_lines() const override { return 1; }
 	virtual void execute_set_input(int inputnum, int state) override;
 	bool memory_translate(address_spacenum spacenum, int intention, offs_t &address) override;

src/devices/cpu/i86/i86.cpp

@@ -314,7 +314,7 @@ i8086_common_cpu_device::i8086_common_cpu_device(const machine_config &mconfig,
 	memset(m_sregs, 0x00, sizeof(m_sregs));
 }
 
-void i8086_common_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void i8086_common_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/i86/i86.h

@@ -127,7 +127,7 @@ protected:
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	virtual void interrupt(int int_num, int trap = 1);
 	bool common_op(UINT8 op);

src/devices/cpu/i960/i960.cpp

@@ -2081,7 +2081,7 @@ void i960_cpu_device::device_start()
 	m_icountptr = &m_icount;
 }
 
-void i960_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void i960_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	static const char *const conditions[8] =
 	{

src/devices/cpu/i960/i960.h

@@ -95,7 +95,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : nullptr; }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 4; }

src/devices/cpu/ie15/ie15.cpp

@@ -132,7 +132,7 @@ void ie15_device::state_export(const device_state_entry &entry)
 //  for the debugger
 //-------------------------------------------------
 
-void ie15_device::state_string_export(const device_state_entry &entry, std::string &str)
+void ie15_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/ie15/ie15.h

@@ -48,7 +48,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override;

src/devices/cpu/jaguar/jaguar.cpp

@@ -400,7 +400,7 @@ void jaguar_cpu_device::device_start()
 }
 
 
-void jaguar_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void jaguar_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/jaguar/jaguar.h

@@ -127,7 +127,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : nullptr; }
 
 	// device_state_interface overrides
-	void state_string_export(const device_state_entry &entry, std::string &str) override;
+	void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 2; }

src/devices/cpu/lc8670/lc8670.cpp

@@ -369,7 +369,7 @@ void lc8670_cpu_device::state_import(const device_state_entry &entry)
 //  for the debugger
 //-------------------------------------------------
 
-void lc8670_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void lc8670_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/lc8670/lc8670.h

@@ -110,7 +110,7 @@ protected:
 
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_memory_interface overrides
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override;

src/devices/cpu/lh5801/lh5801.cpp

@@ -142,7 +142,7 @@ void lh5801_cpu_device::device_start()
 	m_icountptr = &m_icount;
 }
 
-void lh5801_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void lh5801_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/lh5801/lh5801.h

@@ -90,7 +90,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : ( (spacenum == AS_IO) ? &m_io_config : nullptr ); }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/lr35902/lr35902.cpp

@@ -180,7 +180,7 @@ void lr35902_cpu_device::device_start()
 }
 
 
-void lr35902_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void lr35902_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/lr35902/lr35902.h

@@ -70,7 +70,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : nullptr; }
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/m37710/m37710.cpp

@@ -1136,7 +1136,7 @@ void m37710_cpu_device::state_export(const device_state_entry &entry)
 }
 
 
-void m37710_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void m37710_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/m37710/m37710.h

@@ -117,7 +117,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/m6502/m6502.cpp

@@ -439,7 +439,7 @@ void m6502_device::state_export(const device_state_entry &entry)
 {
 }
 
-void m6502_device::state_string_export(const device_state_entry &entry, std::string &str)
+void m6502_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch(entry.index()) {
 	case STATE_GENFLAGS:

src/devices/cpu/m6502/m6502.h

@@ -144,7 +144,7 @@ protected:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override;

src/devices/cpu/m6502/m65ce02.cpp

@@ -75,7 +75,7 @@ void m65ce02_device::state_export(const device_state_entry &entry)
 {
 }
 
-void m65ce02_device::state_string_export(const device_state_entry &entry, std::string &str)
+void m65ce02_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch(entry.index()) {
 	case STATE_GENFLAGS:

src/devices/cpu/m6502/m65ce02.h

@@ -34,7 +34,7 @@ protected:
 	virtual void device_reset() override;
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	inline void dec_SP_ce() { if(P & F_E) SP = set_l(SP, SP-1); else SP--; }
 	inline void inc_SP_ce() { if(P & F_E) SP = set_l(SP, SP+1); else SP++; }

src/devices/cpu/m6502/m740.cpp

@@ -53,7 +53,7 @@ void m740_device::device_reset()
 	SP = 0x00ff;
 }
 
-void m740_device::state_string_export(const device_state_entry &entry, std::string &str)
+void m740_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch(entry.index()) {
 	case STATE_GENFLAGS:

src/devices/cpu/m6502/m740.h

@@ -44,7 +44,7 @@ public:
 
 		static const disasm_entry disasm_entries[0x200];
 
-		virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+		virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 		virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
 		virtual void do_exec_full() override;

src/devices/cpu/m6800/m6800.cpp

@@ -1140,7 +1140,7 @@ void m6800_cpu_device::device_start()
 	m_icountptr = &m_icount;
 }
 
-void m6800_cpu_device::state_string_export(const device_state_entry &entry, std::string &str)
+void m6800_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/m6800/m6800.h

@@ -87,7 +87,7 @@ protected:
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override;
 
 	// device_state_interface overrides
-	void state_string_export(const device_state_entry &entry, std::string &str) override;
+	void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const override { return 1; }

src/devices/cpu/m68000/m68000.h

@@ -396,7 +396,7 @@ public:
 	// device_state_interface overrides
 	virtual void state_import(const device_state_entry &entry) override;
 	virtual void state_export(const device_state_entry &entry) override;
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 	// device_memory_interface overrides
 	virtual bool memory_translate(address_spacenum space, int intention, offs_t &address) override;

src/devices/cpu/m68000/m68kcpu.cpp

@@ -1166,7 +1166,7 @@ void m68000_base_device::state_export(const device_state_entry &entry)
 	}
 }
 
-void m68000_base_device::state_string_export(const device_state_entry &entry, std::string &str)
+void m68000_base_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	UINT16 sr;
 

src/devices/cpu/m6805/m6805.cpp

@@ -493,7 +493,7 @@ const address_space_config *m6805_base_device::memory_space_config(address_space
 //  for the debugger
 //-------------------------------------------------
 
-void m6805_base_device::state_string_export(const device_state_entry &entry, std::string &str)
+void m6805_base_device::state_string_export(const device_state_entry &entry, std::string &str) const
 {
 	switch (entry.index())
 	{

src/devices/cpu/m6805/m6805.h

@@ -51,7 +51,7 @@ protected:
 	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) override;
 
 	// device_state_interface overrides
-	virtual void state_string_export(const device_state_entry &entry, std::string &str) override;
+	virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
 
 private:
 	// opcode/condition tables