diff --git a/cpuexec.h b/cpuexec.h
index 2b4df927..e2679d24 100644
--- a/cpuexec.h
+++ b/cpuexec.h
@@ -287,25 +287,25 @@ static inline void S9xFixCycles (void)
 
 static inline void S9xCheckInterrupts (void)
 {
-	bool8	thisIRQ = PPU.HTimerEnabled || PPU.VTimerEnabled;
+	bool8	thisIRQ = PPU.HTimerEnabled | PPU.VTimerEnabled;
 
-	if (CPU.IRQLine && thisIRQ)
+	if (CPU.IRQLine & thisIRQ)
 		CPU.IRQTransition = TRUE;
 
 	if (PPU.HTimerEnabled)
 	{
 		int32	htimepos = PPU.HTimerPosition;
-		if (CPU.Cycles >= Timings.H_Max && htimepos < CPU.PrevCycles)
+		if (CPU.Cycles >= Timings.H_Max & htimepos < CPU.PrevCycles)
 			htimepos += Timings.H_Max;
 
-		if (CPU.PrevCycles >= htimepos || CPU.Cycles < htimepos)
+		if (CPU.PrevCycles >= htimepos | CPU.Cycles < htimepos)
 			thisIRQ = FALSE;
 	}
 
 	if (PPU.VTimerEnabled)
 	{
 		int32	vcounter = CPU.V_Counter;
-        if (CPU.Cycles >= Timings.H_Max && (!PPU.HTimerEnabled || PPU.HTimerPosition < CPU.PrevCycles)) {
+        if (CPU.Cycles >= Timings.H_Max & (!PPU.HTimerEnabled | PPU.HTimerPosition < CPU.PrevCycles)) {
 			vcounter++;
             if(vcounter >= Timings.V_Max)
                 vcounter = 0;
@@ -315,7 +315,7 @@ static inline void S9xCheckInterrupts (void)
 			thisIRQ = FALSE;
 	}
 
-	if (!CPU.IRQLastState && thisIRQ)
+	if (!CPU.IRQLastState & thisIRQ)
 	{
 #ifdef DEBUGGER
 		S9xTraceFormattedMessage("--- /IRQ High->Low  prev HC:%04d  curr HC:%04d  HTimer:%d Pos:%04d  VTimer:%d Pos:%03d",