diff --git a/src/burn/devices/seibusnd.cpp b/src/burn/devices/seibusnd.cpp
index 74a4a1a28..6da68b463 100644
--- a/src/burn/devices/seibusnd.cpp
+++ b/src/burn/devices/seibusnd.cpp
@@ -83,10 +83,8 @@ static void update_irq_lines(INT32 param)
 	if ((irq1 & irq2) == 0xff) {
 		ZetSetIRQLine(0, ZET_IRQSTATUS_NONE);
 	} else	{
-		if (irq2 == 0xdf) {
-			ZetSetVector(irq1 & irq2);
-			ZetSetIRQLine(0, ZET_IRQSTATUS_ACK);
-		}
+		ZetSetVector(irq1 & irq2);
+		ZetSetIRQLine(0, ZET_IRQSTATUS_ACK);
 	}
 }
 
diff --git a/src/cpu/z80/z80.cpp b/src/cpu/z80/z80.cpp
index d12440e72..3f7457c6e 100644
--- a/src/cpu/z80/z80.cpp
+++ b/src/cpu/z80/z80.cpp
@@ -109,7 +109,7 @@ static Z80WriteProgHandler Z80ProgramWrite;
 static Z80ReadOpHandler Z80CPUReadOp;
 static Z80ReadOpArgHandler Z80CPUReadOpArg;
 
-unsigned char Z80Vector = 0;
+unsigned char Z80Vector = 0xff;
 
 #define VERBOSE 0
 
@@ -3306,7 +3306,6 @@ OP(op,ff) { RST(0x38);											} /* RST  7           */
 static void take_interrupt(void)
 {
 	int irq_vector = Z80Vector;
-	Z80Vector = 0;
 
 	/* there isn't a valid previous program counter */
 	PRVPC = (UINT32)-1;
@@ -3791,8 +3790,6 @@ static void z80_init(int index, int clock, const void *config, int (*irqcallback
 	Z80.irq_callback = irqcallback;
 	IX = IY = 0xffff; /* IX and IY are FFFF after a reset! */
 	F = ZF;			/* Zero flag is set */
-	
-	Z80Vector = 0;
 }
 
 /****************************************************************************
@@ -3809,6 +3806,8 @@ static void z80_reset(void)
 	Z80.irq_state = Z80_CLEAR_LINE;
 	Z80.after_ei = FALSE;
 
+	Z80Vector = 0xff; // Correct to reset this to 0xff?
+
 	if (Z80.daisy)
 		z80daisy_reset(Z80.daisy);