tms99xx: Introduced symbolic constants for interrupt lines. Added a

special RESET line handled by the CPU, not by the emulator core. 
tms9928a/v9938: Introduced dedicated RESET line. [Michael Zapf]

src/emu/cpu/tms9900/tms9900.c

@@ -1154,7 +1154,7 @@ void tms99xx_device::execute_run()
 				}
 			}
 		}
-	} while (m_icount>0);
+	} while (m_icount>0 && !m_reset);
 	if (VERBOSE>6) LOG("tms99xx: cycles expired; will return soon.\n");
 }
 
@@ -1164,6 +1164,12 @@ void tms99xx_device::execute_run()
     Interrupt input
 */
 void tms99xx_device::execute_set_input(int irqline, int state)
+{
+	if (irqline==INPUT_LINE_99XX_RESET && state==ASSERT_LINE)
+	{
+		m_reset = true;
+	}
+	else
 	{
 		if (irqline == INPUT_LINE_NMI)
 		{
@@ -1184,6 +1190,7 @@ void tms99xx_device::execute_set_input(int irqline, int state)
 			}
 		}
 	}
+}
 
 /*
     This can be overloaded by variants of TMS99xx.
@@ -2543,7 +2550,7 @@ UINT32 tms99xx_device::execute_max_cycles() const
 
 UINT32 tms99xx_device::execute_input_lines() const
 {
-	return 1;
+	return 2;
 }
 
 // clocks to cycles, cycles to clocks = id

src/emu/cpu/tms9900/tms9900.h

@@ -47,6 +47,22 @@
 #include "emu.h"
 #include "debugger.h"
 
+/*
+    Define symbols for interrupt lines.
+
+    We use a separate RESET signal which is not captured by the core.
+
+    Caution: Check irqline in set_input_line of each driver using this CPU.
+    Values have changed. Use these symbols instead.
+*/
+enum
+{
+	INPUT_LINE_99XX_RESET = 0,
+	INPUT_LINE_99XX_INTREQ = 1,
+	INPUT_LINE_99XX_INT1 = 2,
+	INPUT_LINE_99XX_INT4 = 3
+};
+
 enum
 {
 	LOAD_INT = -1,

src/emu/cpu/tms9900/tms9995.c

@@ -1118,7 +1118,7 @@ void tms9995_device::execute_run()
 				}
 			}
 		}
-	} while (m_icount>0);
+	} while (m_icount>0 && !m_reset);
 	if (VERBOSE>5) LOG("tms9995: cycles expired; will return soon.\n");
 }
 
@@ -1132,6 +1132,12 @@ void tms9995_device::execute_run()
         flag[2], flag[4]
 */
 void tms9995_device::execute_set_input(int irqline, int state)
+{
+	if (irqline==INPUT_LINE_99XX_RESET && state==ASSERT_LINE)
+	{
+		m_reset = true;
+	}
+	else
 	{
 		if (irqline == INPUT_LINE_NMI)
 		{
@@ -1140,14 +1146,14 @@ void tms9995_device::execute_set_input(int irqline, int state)
 		}
 		else
 		{
-		if (irqline == 1)
+			if (irqline == INPUT_LINE_99XX_INT1)
 			{
 				m_int1_active = m_flag[2] = (state==ASSERT_LINE);
 				if (VERBOSE>3) LOG("tms9995: Line INT1 state=%d\n", state);
 			}
 			else
 			{
-			if (irqline == 4)
+				if (irqline == INPUT_LINE_99XX_INT4)
 				{
 					if (VERBOSE>3) LOG("tms9995: Line INT4/EC state=%d\n", state);
 					if (m_flag[0]==false)
@@ -1168,6 +1174,7 @@ void tms9995_device::execute_set_input(int irqline, int state)
 			}
 		}
 	}
+}
 
 /*
     Issue a pulse on the clock line.

src/emu/cpu/tms9900/tms9995.h

@@ -11,6 +11,22 @@
 #include "emu.h"
 #include "debugger.h"
 
+/*
+    Define symbols for interrupt lines.
+
+    We use a separate RESET signal which is not captured by the core.
+
+    Caution: Check irqline in set_input_line of each driver using this CPU.
+    Values have changed. Use these symbols instead.
+*/
+enum
+{
+	INPUT_LINE_99XX_RESET = 0,
+	INPUT_LINE_99XX_INTREQ = 1,
+	INPUT_LINE_99XX_INT1 = 2,
+	INPUT_LINE_99XX_INT4 = 3
+};
+
 enum
 {
 	TI990_10_ID = 1,

src/emu/video/tms9928a.h

@@ -107,6 +107,9 @@ public:
 	UINT32 screen_update( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect );
 	bitmap_ind16 &get_bitmap() { return m_tmpbmp; }
 
+	/* RESET pin */
+	void reset_line(int state) { if (state==ASSERT_LINE) device_reset(); }
+
 protected:
 	// device-level overrides
 	virtual void device_config_complete();

src/emu/video/v9938.h

@@ -96,6 +96,9 @@ public:
 	static void static_set_vram_size(device_t &device, UINT32 vram_size);
 	static void static_set_interrupt_callback(device_t &device, v99x8_interrupt_delegate callback, const char *device_name);
 
+	/* RESET pin */
+	void reset_line(int state) { if (state==ASSERT_LINE) device_reset(); }
+
 protected:
 	const address_space_config		m_space_config;
 	address_space*					m_vram_space;