diff --git a/src/emu/cpu/cop400/410ops.c b/src/emu/cpu/cop400/410ops.c
index f9a3f68e4ae..a460f417719 100644
--- a/src/emu/cpu/cop400/410ops.c
+++ b/src/emu/cpu/cop400/410ops.c
@@ -403,7 +403,7 @@ INSTRUCTION(jp)
 	{
 		// JSRP
 		UINT8 a = opcode & 0x3f;
-		PUSH(PC + 1);
+		PUSH(PC);
 		PC = 0x80 | a;
 	}
 }
@@ -530,7 +530,7 @@ INSTRUCTION(ld)
 
 INSTRUCTION(lqid)
 {
-	PUSH(PC + 1);
+	PUSH(PC);
 	PC = (PC & 0x300) | (A << 4) | RAM_R(B);
 	WRITE_Q(ROM(PC));
 	POP();
diff --git a/src/emu/cpu/cop400/cop420.c b/src/emu/cpu/cop400/cop420.c
index ed6d552f596..ae1b2d92656 100644
--- a/src/emu/cpu/cop400/cop420.c
+++ b/src/emu/cpu/cop400/cop420.c
@@ -13,8 +13,11 @@
 
     TODO:
 
+	- fix XAS
+	- run interrupt test suite 
+	- run production test suite
+    - fix INIL
     - remove LBIops
-    - INIL
 
 */
 
@@ -118,12 +121,12 @@ static void cop420_op23(UINT8 opcode)
 
 static const s_opcode opcode_33_map[256]=
 {
-	{1, inil 		},{1, skgbz0 	},{1, illegal 	},{1, skgbz2 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
+	{1, illegal		},{1, skgbz0 	},{1, illegal 	},{1, skgbz2 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
 	{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
 	{1, illegal 	},{1, skgbz1 	},{1, illegal 	},{1, skgbz3 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
 	{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
 	{1, illegal 	},{1, skgz	 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
-	{1, inin 		},{1, illegal 	},{1, ing	 	},{1, illegal 	},{1, cqma	 	},{1, illegal 	},{1, inl	 	},{1, illegal 	},
+	{1, inin 		},{1, inil 		},{1, ing	 	},{1, illegal 	},{1, cqma	 	},{1, illegal 	},{1, inl	 	},{1, illegal 	},
 	{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
 	{1, illegal 	},{1, illegal 	},{1, omg	 	},{1, illegal 	},{1, camq	 	},{1, illegal 	},{1, obd	 	},{1, illegal 	},
 
@@ -136,14 +139,14 @@ static const s_opcode opcode_33_map[256]=
 	{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
 	{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
 
-	{1, illegal 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
-	{1, lbi		 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
-	{1, illegal 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
-	{1, lbi		 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
-	{1, illegal 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
-	{1, lbi		 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
-	{1, illegal 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
-	{1, lbi		 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
+	{1, lbi		 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
+	{1, lbi		 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
+	{1, lbi		 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
+	{1, lbi		 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
+	{1, lbi		 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
+	{1, lbi		 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
+	{1, lbi		 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
+	{1, lbi		 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},{1, lbi	 	},
 
 	{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
 	{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},{1, illegal 	},
@@ -247,7 +250,7 @@ static void cop420_init(int index, int clock, const void *config, int (*irqcallb
 	timer_adjust_periodic(cop420_serial_timer, attotime_zero, index, ATTOTIME_IN_HZ(clock));
 
 	cop420_counter_timer = timer_alloc(cop420_counter_tick, NULL);
-	timer_adjust_periodic(cop420_counter_timer, attotime_zero, index, ATTOTIME_IN_HZ(clock / 1024));
+	timer_adjust_periodic(cop420_counter_timer, attotime_zero, index, ATTOTIME_IN_HZ(clock));
 
 	for (i=0; i<256; i++) InstLen[i]=1;
 
@@ -262,10 +265,7 @@ static void cop420_init(int index, int clock, const void *config, int (*irqcallb
 	for (i=0x38; i<0x40; i++) LBIops[i] = 1;
 
 	for (i=0; i<256; i++) LBIops33[i] = 0;
-	for (i=0x81; i<0x89; i++) LBIops33[i] = 1;
-	for (i=0x91; i<0x99; i++) LBIops33[i] = 1;
-	for (i=0xa1; i<0xa9; i++) LBIops33[i] = 1;
-	for (i=0xb1; i<0xb9; i++) LBIops33[i] = 1;
+	for (i=0x80; i<0xc0; i++) LBIops33[i] = 1;
 
 	state_save_register_item("cop420", index, PC);
 	state_save_register_item("cop420", index, R.PREVPC);
diff --git a/src/emu/cpu/cop400/cop420ds.c b/src/emu/cpu/cop400/cop420ds.c
index 7f3cf432108..13cbac9ca78 100644
--- a/src/emu/cpu/cop400/cop420ds.c
+++ b/src/emu/cpu/cop400/cop420ds.c
@@ -216,19 +216,19 @@ offs_t cop420_dasm(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opr
 			{
 				sprintf(buffer, "LEI %u", next_opcode & 0xF);
 			}
-			else if (next_opcode >= 0x81 && next_opcode <= 0x88)
+			else if (next_opcode >= 0x80 && next_opcode <= 0x8F)
 			{
 				sprintf(buffer, "LBI 0,%u", next_opcode & 0xF);
 			}
-			else if (next_opcode >= 0x91 && next_opcode <= 0x98)
+			else if (next_opcode >= 0x90 && next_opcode <= 0x9F)
 			{
 				sprintf(buffer, "LBI 1,%u", next_opcode & 0xF);
 			}
-			else if (next_opcode >= 0xA1 && next_opcode <= 0xA8)
+			else if (next_opcode >= 0xA0 && next_opcode <= 0xAF)
 			{
 				sprintf(buffer, "LBI 2,%u", next_opcode & 0xF);
 			}
-			else if (next_opcode >= 0xB1 && next_opcode <= 0xB8)
+			else if (next_opcode >= 0xB0 && next_opcode <= 0xBF)
 			{
 				sprintf(buffer, "LBI 3,%u", next_opcode & 0xF);
 			}
@@ -236,10 +236,6 @@ offs_t cop420_dasm(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opr
 			{
 				switch (next_opcode)
 				{
-				case 0x00:
-					sprintf(buffer, "INIL");
-					break;
-
 				case 0x01:
 					sprintf(buffer, "SKGBZ 0");
 					break;
@@ -264,6 +260,10 @@ offs_t cop420_dasm(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opr
 					sprintf(buffer, "ININ");
 					break;
 
+				case 0x29:
+					sprintf(buffer, "INIL");
+					break;
+
 				case 0x2A:
 					sprintf(buffer, "ING");
 					break;
diff --git a/src/mame/drivers/cidelsa.c b/src/mame/drivers/cidelsa.c
index 93e23d6c839..90caefe2ffd 100644
--- a/src/mame/drivers/cidelsa.c
+++ b/src/mame/drivers/cidelsa.c
@@ -12,7 +12,6 @@
     TODO:
 
     - move set_cpu_mode timer call to MDRV
-    - fix COP420 core to get sound in Draco
 
 */
 
@@ -708,7 +707,6 @@ static MACHINE_DRIVER_START( draco )
 	MDRV_SPEAKER_STANDARD_MONO("mono")
 
 	MDRV_SOUND_ADD(CDP1869, DRACO_CHR2)
-	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
 
 	MDRV_SOUND_ADD(AY8910, DRACO_SND_CHR1)
 	MDRV_SOUND_CONFIG(ay8910_interface)
@@ -764,4 +762,4 @@ ROM_END
 GAME( 1980, destryer, 0, 		destryer, destryer, 0, ROT90, "Cidelsa", "Destroyer (Cidelsa) (set 1)", GAME_IMPERFECT_SOUND | GAME_SUPPORTS_SAVE )
 GAME( 1980, destryea, destryer, destryea, destryer, 0, ROT90, "Cidelsa", "Destroyer (Cidelsa) (set 2)", GAME_IMPERFECT_SOUND | GAME_SUPPORTS_SAVE )
 GAME( 1981, altair,   0, 		altair,   altair,   0, ROT90, "Cidelsa", "Altair", GAME_IMPERFECT_SOUND | GAME_SUPPORTS_SAVE )
-GAME( 1981, draco,    0, 		draco,    draco,    0, ROT90, "Cidelsa", "Draco", GAME_IMPERFECT_COLORS | GAME_IMPERFECT_SOUND | GAME_SUPPORTS_SAVE )
+GAME( 1981, draco,    0, 		draco,    draco,    0, ROT90, "Cidelsa", "Draco", GAME_IMPERFECT_COLORS | GAME_SUPPORTS_SAVE )