diff --git a/src/emu/machine/tms6100.c b/src/emu/machine/tms6100.c
index 9cedc12c10a..6c5a58673dd 100644
--- a/src/emu/machine/tms6100.c
+++ b/src/emu/machine/tms6100.c
@@ -88,6 +88,11 @@
 #define TMS6100_READ_PENDING        0x01
 #define TMS6100_NEXT_READ_IS_DUMMY  0x02
 
+/* Variants */
+
+#define TMS6110_IS_TMS6100    (1)
+#define TMS6110_IS_M58819     (2)
+
 
 const device_type TMS6100 = &device_creator<tms6100_device>;
 
@@ -136,15 +141,15 @@ void tms6100_device::device_start()
 	save_item(NAME(m_m0));
 	save_item(NAME(m_m1));
 	save_item(NAME(m_state));
-	//save_item(NAME(m_variant));
-	//tms6100_set_variant(tms, TMS6110_IS_TMS6100);
+	save_item(NAME(m_variant));
+	set_variant(TMS6110_IS_TMS6100);
 
 }
 
 void m58819_device::device_start()
 {
 	tms6100_device::device_start();
-	//tms6100_set_variant(tms, TMS6110_IS_M58819);
+	set_variant(TMS6110_IS_M58819);
 }
 
 //-------------------------------------------------
@@ -165,6 +170,11 @@ void tms6100_device::device_reset()
 	m_data = 0;
 }
 
+void tms6100_device::set_variant(int variant)
+{
+	m_variant = variant;
+}
+
 WRITE_LINE_MEMBER(tms6100_device::tms6100_m0_w)
 {
 	if (state != m_m0)
@@ -199,15 +209,14 @@ WRITE_LINE_MEMBER(tms6100_device::tms6100_romclock_w)
 				else
 				{
 					/* read bit at address */
-					/* if (m_variant == TMS6110_IS_M58819)
+					if (m_variant == TMS6110_IS_M58819)
 					{
 					    m_data = (m_rom[m_address >> 3] >> (7-(m_address & 0x07))) & 1;
 					}
 					else // m_variant == (TMS6110_IS_TMS6100 || TMS6110_IS_TMS6125)
 					{
-					    */
-					m_data = (m_rom[m_address >> 3] >> (m_address & 0x07)) & 1;
-					/* } */
+						m_data = (m_rom[m_address >> 3] >> (m_address & 0x07)) & 1;
+					}
 					m_address++;
 				}
 				m_state &= ~TMS6100_READ_PENDING;
diff --git a/src/emu/machine/tms6100.h b/src/emu/machine/tms6100.h
index 2838adf63cf..4aed02a846b 100644
--- a/src/emu/machine/tms6100.h
+++ b/src/emu/machine/tms6100.h
@@ -25,6 +25,7 @@ protected:
 	virtual void device_config_complete();
 	virtual void device_start();
 	virtual void device_reset();
+	void set_variant(int variant);
 private:
 	// internal state
 	required_region_ptr<UINT8> m_rom;
@@ -37,7 +38,7 @@ private:
 	UINT8  m_tms_clock;
 	UINT8  m_data;
 	UINT8  m_state;
-	//UINT8  m_variant;
+	UINT8  m_variant;
 
 };