diff --git a/arch/x86/src/qemu/qemu_handlers.c b/arch/x86/src/qemu/qemu_handlers.c
index 221bfbf0f87..05b5dee3f16 100644
--- a/arch/x86/src/qemu/qemu_handlers.c
+++ b/arch/x86/src/qemu/qemu_handlers.c
@@ -101,10 +101,6 @@ static uint32_t *common_handler(int irq, uint32_t *regs)
   DEBUGASSERT(current_regs == NULL);
   current_regs = regs;
 
-  /* Mask and acknowledge the interrupt */
-
-  up_maskack_irq(irq);
-
   /* Deliver the IRQ */
 
   irq_dispatch(irq, regs);
@@ -120,10 +116,6 @@ static uint32_t *common_handler(int irq, uint32_t *regs)
   /* Indicate that we are no long in an interrupt handler */
 
   current_regs = NULL;
-
-  /* Unmask the last interrupt (global interrupts are still disabled) */
-
-  up_enable_irq(irq);
   return regs;
 }
 #endif
diff --git a/arch/x86/src/qemu/qemu_head.S b/arch/x86/src/qemu/qemu_head.S
index 4840b9135a0..096705f46bd 100755
--- a/arch/x86/src/qemu/qemu_head.S
+++ b/arch/x86/src/qemu/qemu_head.S
@@ -161,17 +161,25 @@ g_heapbase:
 	.type	__start, @function
 __start:
 	/* Set up the stack */
-
+        mov     $'a', %ax
+        mov     $0x3f8, %dx
+        outb    %al, %dx
 	mov		$(idle_stack + CONFIG_IDLETHREAD_STACKSIZE), %esp
 
 	/* Multiboot setup */
 
 	push	%eax						/* Multiboot magic number */
 	push	%ebx						/* Multiboot data structure */
+        mov     $'b', %ax
+        mov     $0x3f8, %dx
+        outb    %al, %dx
 
 	/* Initialize and start NuttX */
 
 	call	up_lowsetup					/* Low-level, pre-OS initialization */
+        mov     $'c', %ax
+        mov     $0x3f8, %dx
+        outb    %al, %dx
 	call	os_start					/* Start NuttX */
 
 	/* NuttX will not return */
diff --git a/arch/x86/src/qemu/qemu_irq.c b/arch/x86/src/qemu/qemu_irq.c
index be6c4a40e5a..f266f67144b 100755
--- a/arch/x86/src/qemu/qemu_irq.c
+++ b/arch/x86/src/qemu/qemu_irq.c
@@ -256,64 +256,6 @@ void up_irqinitialize(void)
   /* And finally, enable interrupts */
 
 #ifndef CONFIG_SUPPRESS_INTERRUPTS
-  irqrestore(0);
+  irqrestore(X86_FLAGS_IF);
 #endif
 }
-
-/****************************************************************************
- * Name: up_disable_irq
- *
- * Description:
- *   Disable the IRQ specified by 'irq'
- *
- ****************************************************************************/
-
-void up_disable_irq(int irq)
-{
-#warning "Missing Logic"
-}
-
-/****************************************************************************
- * Name: up_enable_irq
- *
- * Description:
- *   Enable the IRQ specified by 'irq'
- *
- ****************************************************************************/
-
-void up_enable_irq(int irq)
-{
-#warning "Missing Logic"
-}
-
-/****************************************************************************
- * Name: up_maskack_irq
- *
- * Description:
- *   Mask the IRQ and acknowledge it
- *
- ****************************************************************************/
-
-void up_maskack_irq(int irq)
-{
-#warning "Missing Logic"
-}
-
-/****************************************************************************
- * Name: up_prioritize_irq
- *
- * Description:
- *   Set the priority of an IRQ.
- *
- *   Since this API is not supported on all architectures, it should be
- *   avoided in common implementations where possible.
- *
- ****************************************************************************/
-
-#ifdef CONFIG_ARCH_IRQPRIO
-int up_prioritize_irq(int irq, int priority)
-{
-#warning "Missing Logic"
-  return OK;
-}
-#endif