diff --git a/src/emu/cpu/tms7000/tms7000.c b/src/emu/cpu/tms7000/tms7000.c
index 7d84f90425d..a8cb10d70c6 100644
--- a/src/emu/cpu/tms7000/tms7000.c
+++ b/src/emu/cpu/tms7000/tms7000.c
@@ -44,10 +44,6 @@ const device_type TMS70C00 = &device_creator<tms70c00_device>;
 const device_type TMS70C20 = &device_creator<tms70c20_device>;
 const device_type TMS70C40 = &device_creator<tms70c40_device>;
 
-// 70C46 is same as 70C40, except with support for memory mapped I/O?
-// note: may also be labeled TMC70009
-const device_type TMS70C46 = &device_creator<tms70c46_device>;
-
 // 70x1 features more peripheral I/O, the main addition being a serial port.
 // 70x2 is the same, just with twice more RAM (256 bytes)
 const device_type TMS7001 = &device_creator<tms7001_device>;
@@ -164,11 +160,6 @@ tms70c40_device::tms70c40_device(const machine_config &mconfig, const char *tag,
 {
 }
 
-tms70c46_device::tms70c46_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
-	: tms7000_device(mconfig, TMS70C46, "TMS70C46", tag, owner, clock, ADDRESS_MAP_NAME(tms7040_mem), TMS7000_CHIP_IS_CMOS, "tms70c46", __FILE__)
-{
-}
-
 tms7001_device::tms7001_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
 	: tms7000_device(mconfig, TMS7001, "TMS7001", tag, owner, clock, ADDRESS_MAP_NAME(tms7001_mem), TMS7000_CHIP_FAMILY_70X2, "tms7001", __FILE__)
 {
diff --git a/src/emu/cpu/tms7000/tms7000.h b/src/emu/cpu/tms7000/tms7000.h
index 1a66c79b9cf..d28e5b8de35 100644
--- a/src/emu/cpu/tms7000/tms7000.h
+++ b/src/emu/cpu/tms7000/tms7000.h
@@ -304,13 +304,6 @@ public:
 };
 
 
-class tms70c46_device : public tms7000_device
-{
-public:
-	tms70c46_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
-};
-
-
 class tms7001_device : public tms7000_device
 {
 public:
@@ -346,7 +339,6 @@ extern const device_type TMS7040;
 extern const device_type TMS70C00;
 extern const device_type TMS70C20;
 extern const device_type TMS70C40;
-extern const device_type TMS70C46;
 extern const device_type TMS7001;
 extern const device_type TMS7041;
 extern const device_type TMS7002;
diff --git a/src/mess/drivers/ti74.c b/src/mess/drivers/ti74.c
index fdb7b78da9c..c428f1822ba 100644
--- a/src/mess/drivers/ti74.c
+++ b/src/mess/drivers/ti74.c
@@ -79,7 +79,7 @@ public:
 		m_maincpu(*this, "maincpu")
 	{ }
 
-	required_device<tms70c46_device> m_maincpu;
+	required_device<tms70c40_device> m_maincpu;
 
 	ioport_port *m_key_matrix[8];
 	emu_timer *m_poweron_timer;
@@ -416,7 +416,7 @@ void ti74_state::machine_start()
 static MACHINE_CONFIG_START( ti74, ti74_state )
 
 	/* basic machine hardware */
-	MCFG_CPU_ADD("maincpu", TMS70C46, XTAL_4MHz)
+	MCFG_CPU_ADD("maincpu", TMS70C40, XTAL_4MHz) // C70009 is a TMS70C40 underneath
 	MCFG_CPU_PROGRAM_MAP(main_map)
 	MCFG_CPU_IO_MAP(main_io_map)