diff --git a/scripts/src/cpu.lua b/scripts/src/cpu.lua
index 324d6910bd4..fba4b569059 100644
--- a/scripts/src/cpu.lua
+++ b/scripts/src/cpu.lua
@@ -1555,6 +1555,8 @@ if (CPUS["SM510"]~=null) then
 		MAME_DIR .. "src/emu/cpu/sm510/sm510.c",
 		MAME_DIR .. "src/emu/cpu/sm510/sm510.h",
 		MAME_DIR .. "src/emu/cpu/sm510/sm510op.c",
+		MAME_DIR .. "src/emu/cpu/sm510/sm510core.c",
+		MAME_DIR .. "src/emu/cpu/sm510/sm511core.c",
 	}
 end
 
diff --git a/src/emu/cpu/sm510/sm510.c b/src/emu/cpu/sm510/sm510.c
index 502eb41b7f6..ca8db4635f7 100644
--- a/src/emu/cpu/sm510/sm510.c
+++ b/src/emu/cpu/sm510/sm510.c
@@ -2,7 +2,10 @@
 // copyright-holders:hap
 /*
 
-  Sharp SM510 MCU family cores
+  Sharp SM510 MCU family - known chips:
+  - SM510: x
+  - SM511: x
+  - SM512: x
 
   References:
   - 1990 Sharp Microcomputers Data Book
@@ -15,43 +18,6 @@
 #include "sm510.h"
 #include "debugger.h"
 
-// MCU types
-
-const device_type SM510 = &device_creator<sm510_device>;
-
-
-// internal memory maps
-static ADDRESS_MAP_START(program_2_7k, AS_PROGRAM, 8, sm510_base_device)
-	AM_RANGE(0x0000, 0x02af) AM_ROM
-	AM_RANGE(0x0400, 0x06af) AM_ROM
-	AM_RANGE(0x0800, 0x0aaf) AM_ROM
-	AM_RANGE(0x0c00, 0x0eaf) AM_ROM
-ADDRESS_MAP_END
-
-
-static ADDRESS_MAP_START(data_96_32x4, AS_DATA, 8, sm510_base_device)
-	AM_RANGE(0x00, 0x5f) AM_RAM
-	AM_RANGE(0x60, 0x7f) AM_RAM
-ADDRESS_MAP_END
-
-
-
-// device definitions
-
-sm510_device::sm510_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
-	: sm510_base_device(mconfig, SM510, "SM510", tag, owner, clock, 2 /* stack levels */, 12 /* prg width */, ADDRESS_MAP_NAME(program_2_7k), 7 /* data width */, ADDRESS_MAP_NAME(data_96_32x4), "sm510", __FILE__)
-{ }
-
-
-
-// disasm
-offs_t sm510_base_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options)
-{
-	extern CPU_DISASSEMBLE(sm510);
-	return CPU_DISASSEMBLE_NAME(sm510)(this, buffer, pc, oprom, opram, options);
-}
-
-
 
 //-------------------------------------------------
 //  device_start - device-specific startup
@@ -130,7 +96,7 @@ void sm510_base_device::device_reset()
 //  execute
 //-------------------------------------------------
 
-inline void sm510_base_device::increment_pc()
+void sm510_base_device::increment_pc()
 {
 	// PL(program counter low 6 bits) is a simple LFSR: newbit = (bit0==bit1)
 	// PU,PM(high bits) specify page, PL specifies steps within page
@@ -138,17 +104,6 @@ inline void sm510_base_device::increment_pc()
 	m_pc = feed | (m_pc >> 1 & 0x1f) | (m_pc & ~0x3f);
 }
 
-void sm510_base_device::get_opcode_param()
-{
-	// LBL, TL, TML opcodes are 2 bytes
-	if (m_op == 0x5f || (m_op & 0xf0) == 0x70)
-	{
-		m_icount--;
-		m_param = m_program->read_byte(m_pc);
-		increment_pc();
-	}
-}
-
 void sm510_base_device::execute_run()
 {
 	while (m_icount > 0)
@@ -170,79 +125,7 @@ void sm510_base_device::execute_run()
 			m_skip = false;
 			m_op = 0; // fake nop
 		}
-		else //execute_one();
-
-		switch (m_op & 0xf0)
-		{
-			case 0x20: op_lax(); break;
-			case 0x30: op_adx(); break;
-			case 0x40: op_lb(); break;
-
-			case 0x80: case 0x90: case 0xa0: case 0xb0:
-				op_t(); break;
-			case 0xc0: case 0xd0: case 0xe0: case 0xf0:
-				op_tm(); break;
-
-			default:
-				switch (m_op & 0xfc)
-				{
-			case 0x04: op_rm(); break;
-			case 0x0c: op_sm(); break;
-			case 0x10: op_exc(); break;
-			case 0x14: op_exci(); break;
-			case 0x18: op_lda(); break;
-			case 0x1c: op_excd(); break;
-			case 0x54: op_tmi(); break;
-			case 0x70: case 0x74: case 0x78: op_tl(); break;
-			case 0x7c: op_tml(); break;
-
-			default:
-				switch (m_op)
-				{
-			case 0x00: op_skip(); break;
-			case 0x01: op_atbp(); break;
-			case 0x02: op_sbm(); break;
-			case 0x03: op_atpl(); break;
-			case 0x08: op_add(); break;
-			case 0x09: op_add11(); break;
-			case 0x0a: op_coma(); break;
-			case 0x0b: op_exbla(); break;
-
-			case 0x51: op_tb(); break;
-			case 0x52: op_tc(); break;
-			case 0x53: op_tam(); break;
-			case 0x58: op_tis(); break;
-			case 0x59: op_atl(); break;
-			case 0x5a: op_ta0(); break;
-			case 0x5b: op_tabl(); break;
-			case 0x5d: op_cend(); break;
-			case 0x5e: op_tal(); break;
-			case 0x5f: op_lbl(); break;
-
-			case 0x60: op_atfc(); break;
-			case 0x61: op_atr(); break;
-			case 0x62: op_wr(); break;
-			case 0x63: op_ws(); break;
-			case 0x64: op_incb(); break;
-			case 0x65: op_idiv(); break;
-			case 0x66: op_rc(); break;
-			case 0x67: op_sc(); break;
-			case 0x68: op_tf1(); break;
-			case 0x69: op_tf4(); break;
-			case 0x6a: op_kta(); break;
-			case 0x6b: op_rot(); break;
-			case 0x6c: op_decb(); break;
-			case 0x6d: op_bdc(); break;
-			case 0x6e: op_rtn0(); break;
-			case 0x6f: op_rtn1(); break;
-
-			default: op_illegal(); break;
-				}
-				break; // 0xff
-
-				}
-				break; // 0xfc
-
-		} // big switch
+		else
+			execute_one();
 	}
 }
diff --git a/src/emu/cpu/sm510/sm510.h b/src/emu/cpu/sm510/sm510.h
index 379bc13c314..0b37d76eef3 100644
--- a/src/emu/cpu/sm510/sm510.h
+++ b/src/emu/cpu/sm510/sm510.h
@@ -49,6 +49,7 @@ protected:
 	virtual UINT32 execute_input_lines() const { return 1; }
 	//virtual void execute_set_input(int line, int state);
 	virtual void execute_run();
+	virtual void execute_one() { } // -> child class
 
 	// device_memory_interface overrides
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const { return(spacenum == AS_PROGRAM) ? &m_program_config : ((spacenum == AS_DATA) ? &m_data_config : NULL); }
@@ -56,7 +57,6 @@ protected:
 	// device_disasm_interface overrides
 	virtual UINT32 disasm_min_opcode_bytes() const { return 1; }
 	virtual UINT32 disasm_max_opcode_bytes() const { return 2; }
-	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options);
 
 	address_space_config m_program_config;
 	address_space_config m_data_config;
@@ -88,7 +88,7 @@ protected:
 
 	// misc internal helpers
 	void increment_pc();
-	virtual void get_opcode_param();
+	virtual void get_opcode_param() { } // -> child class
 
 	UINT8 ram_r();
 	void ram_w(UINT8 data);
@@ -156,14 +156,42 @@ protected:
 	void op_illegal();
 };
 
+
 class sm510_device : public sm510_base_device
 {
 public:
 	sm510_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+protected:
+	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options);
+	virtual void execute_one();
+	virtual void get_opcode_param();
 };
 
 
+class sm511_device : public sm510_base_device
+{
+public:
+	sm511_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+	sm511_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, int stack_levels, int prgwidth, address_map_constructor program, int datawidth, address_map_constructor data, const char *shortname, const char *source);
+
+protected:
+	virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options);
+	virtual void execute_one();
+	virtual void get_opcode_param();
+};
+
+class sm512_device : public sm511_device
+{
+public:
+	sm512_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+};
+
+
+
 extern const device_type SM510;
+extern const device_type SM511;
+extern const device_type SM512;
 
 
 #endif /* _SM510_H_ */
diff --git a/src/emu/cpu/sm510/sm510core.c b/src/emu/cpu/sm510/sm510core.c
new file mode 100644
index 00000000000..791c44f4a24
--- /dev/null
+++ b/src/emu/cpu/sm510/sm510core.c
@@ -0,0 +1,134 @@
+// license:BSD-3-Clause
+// copyright-holders:hap
+/*
+
+  Sharp SM510 MCU core implementation
+
+*/
+
+#include "sm510.h"
+#include "debugger.h"
+
+
+// MCU types
+const device_type SM510 = &device_creator<sm510_device>;
+
+
+// internal memory maps
+static ADDRESS_MAP_START(program_2_7k, AS_PROGRAM, 8, sm510_base_device)
+	AM_RANGE(0x0000, 0x02af) AM_ROM
+	AM_RANGE(0x0400, 0x06af) AM_ROM
+	AM_RANGE(0x0800, 0x0aaf) AM_ROM
+	AM_RANGE(0x0c00, 0x0eaf) AM_ROM
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(data_96_32x4, AS_DATA, 8, sm510_base_device)
+	AM_RANGE(0x00, 0x5f) AM_RAM
+	AM_RANGE(0x60, 0x7f) AM_RAM
+ADDRESS_MAP_END
+
+
+// device definitions
+sm510_device::sm510_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+	: sm510_base_device(mconfig, SM510, "SM510", tag, owner, clock, 2 /* stack levels */, 12 /* prg width */, ADDRESS_MAP_NAME(program_2_7k), 7 /* data width */, ADDRESS_MAP_NAME(data_96_32x4), "sm510", __FILE__)
+{ }
+
+
+// disasm
+offs_t sm510_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options)
+{
+	extern CPU_DISASSEMBLE(sm510);
+	return CPU_DISASSEMBLE_NAME(sm510)(this, buffer, pc, oprom, opram, options);
+}
+
+
+//-------------------------------------------------
+//  execute
+//-------------------------------------------------
+
+void sm510_device::get_opcode_param()
+{
+	// LBL, TL, TML opcodes are 2 bytes
+	if (m_op == 0x5f || (m_op & 0xf0) == 0x70)
+	{
+		m_icount--;
+		m_param = m_program->read_byte(m_pc);
+		increment_pc();
+	}
+}
+
+void sm510_device::execute_one()
+{
+	switch (m_op & 0xf0)
+	{
+		case 0x20: op_lax(); break;
+		case 0x30: op_adx(); break;
+		case 0x40: op_lb(); break;
+
+		case 0x80: case 0x90: case 0xa0: case 0xb0:
+			op_t(); break;
+		case 0xc0: case 0xd0: case 0xe0: case 0xf0:
+			op_tm(); break;
+
+		default:
+			switch (m_op & 0xfc)
+			{
+		case 0x04: op_rm(); break;
+		case 0x0c: op_sm(); break;
+		case 0x10: op_exc(); break;
+		case 0x14: op_exci(); break;
+		case 0x18: op_lda(); break;
+		case 0x1c: op_excd(); break;
+		case 0x54: op_tmi(); break;
+		case 0x70: case 0x74: case 0x78: op_tl(); break;
+		case 0x7c: op_tml(); break;
+
+		default:
+			switch (m_op)
+			{
+		case 0x00: op_skip(); break;
+		case 0x01: op_atbp(); break;
+		case 0x02: op_sbm(); break;
+		case 0x03: op_atpl(); break;
+		case 0x08: op_add(); break;
+		case 0x09: op_add11(); break;
+		case 0x0a: op_coma(); break;
+		case 0x0b: op_exbla(); break;
+
+		case 0x51: op_tb(); break;
+		case 0x52: op_tc(); break;
+		case 0x53: op_tam(); break;
+		case 0x58: op_tis(); break;
+		case 0x59: op_atl(); break;
+		case 0x5a: op_ta0(); break;
+		case 0x5b: op_tabl(); break;
+		case 0x5d: op_cend(); break;
+		case 0x5e: op_tal(); break;
+		case 0x5f: op_lbl(); break;
+
+		case 0x60: op_atfc(); break;
+		case 0x61: op_atr(); break;
+		case 0x62: op_wr(); break;
+		case 0x63: op_ws(); break;
+		case 0x64: op_incb(); break;
+		case 0x65: op_idiv(); break;
+		case 0x66: op_rc(); break;
+		case 0x67: op_sc(); break;
+		case 0x68: op_tf1(); break;
+		case 0x69: op_tf4(); break;
+		case 0x6a: op_kta(); break;
+		case 0x6b: op_rot(); break;
+		case 0x6c: op_decb(); break;
+		case 0x6d: op_bdc(); break;
+		case 0x6e: op_rtn0(); break;
+		case 0x6f: op_rtn1(); break;
+
+		default: op_illegal(); break;
+			}
+			break; // 0xff
+
+			}
+			break; // 0xfc
+
+	} // big switch
+}
diff --git a/src/emu/cpu/sm510/sm510d.c b/src/emu/cpu/sm510/sm510d.c
index dffd5e1530c..43651e52015 100644
--- a/src/emu/cpu/sm510/sm510d.c
+++ b/src/emu/cpu/sm510/sm510d.c
@@ -11,6 +11,8 @@
 #include "sm510.h"
 
 
+// common
+
 enum e_mnemonics
 {
 	mILL,
@@ -73,6 +75,9 @@ static const INT8 s_next_pc[0x40] =
 };
 
 
+
+// SM510 disasm
+
 static const UINT8 sm510_mnemonic[0x100] =
 {
 /*  0      1      2      3      4      5      6      7      8      9      A      B      C      D      E      F  */
@@ -97,8 +102,6 @@ static const UINT8 sm510_mnemonic[0x100] =
 	mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM,   mTM    // F
 };
 
-
-
 CPU_DISASSEMBLE(sm510)
 {
 	// get raw opcode
@@ -142,3 +145,12 @@ CPU_DISASSEMBLE(sm510)
 	
 	return len | s_flags[instr] | DASMFLAG_SUPPORTED;
 }
+
+
+
+// SM511 disasm
+
+CPU_DISASSEMBLE(sm511)
+{
+	return 1;
+}
diff --git a/src/emu/cpu/sm510/sm511core.c b/src/emu/cpu/sm510/sm511core.c
new file mode 100644
index 00000000000..237e5b72d7b
--- /dev/null
+++ b/src/emu/cpu/sm510/sm511core.c
@@ -0,0 +1,67 @@
+// license:BSD-3-Clause
+// copyright-holders:hap
+/*
+
+  Sharp SM511 MCU core implementation
+
+*/
+
+#include "sm510.h"
+#include "debugger.h"
+
+
+// MCU types
+const device_type SM511 = &device_creator<sm511_device>;
+const device_type SM512 = &device_creator<sm512_device>;
+
+
+// internal memory maps
+static ADDRESS_MAP_START(program_4k, AS_PROGRAM, 8, sm510_base_device)
+	AM_RANGE(0x0000, 0x0fff) AM_ROM
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(data_96_32x4, AS_DATA, 8, sm510_base_device)
+	AM_RANGE(0x00, 0x5f) AM_RAM
+	AM_RANGE(0x60, 0x7f) AM_RAM
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(data_80_48x4, AS_DATA, 8, sm510_base_device)
+	AM_RANGE(0x00, 0x4f) AM_RAM
+	AM_RANGE(0x50, 0x7f) AM_RAM
+ADDRESS_MAP_END
+
+
+// disasm
+offs_t sm511_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options)
+{
+	extern CPU_DISASSEMBLE(sm511);
+	return CPU_DISASSEMBLE_NAME(sm511)(this, buffer, pc, oprom, opram, options);
+}
+
+
+// device definitions
+sm511_device::sm511_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+	: sm510_base_device(mconfig, SM511, "SM511", tag, owner, clock, 2 /* stack levels */, 12 /* prg width */, ADDRESS_MAP_NAME(program_4k), 7 /* data width */, ADDRESS_MAP_NAME(data_96_32x4), "sm511", __FILE__)
+{ }
+
+sm511_device::sm511_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, int stack_levels, int prgwidth, address_map_constructor program, int datawidth, address_map_constructor data, const char *shortname, const char *source)
+	: sm510_base_device(mconfig, type, name, tag, owner, clock, stack_levels, prgwidth, program, datawidth, data, shortname, source)
+{ }
+
+sm512_device::sm512_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+	: sm511_device(mconfig, SM512, "SM512", tag, owner, clock, 2, 12, ADDRESS_MAP_NAME(program_4k), 7, ADDRESS_MAP_NAME(data_80_48x4), "sm512", __FILE__)
+{ }
+
+
+
+//-------------------------------------------------
+//  execute
+//-------------------------------------------------
+
+void sm511_device::get_opcode_param()
+{
+}
+
+void sm511_device::execute_one()
+{
+}