diff --git a/reactos/include/ndk/asm.h b/reactos/include/ndk/asm.h
index 3457aa2afd0..6395651d15a 100644
--- a/reactos/include/ndk/asm.h
+++ b/reactos/include/ndk/asm.h
@@ -227,12 +227,13 @@ Author:
 //
 // KINTERRUPT Offsets
 //
+#define KINTERRUPT_INTERRUPT_LIST_HEAD          0x04
 #define KINTERRUPT_SERVICE_ROUTINE              0x0C
 #define KINTERRUPT_SERVICE_CONTEXT              0x10
 #define KINTERRUPT_TICK_COUNT                   0x18
 #define KINTERRUPT_ACTUAL_LOCK                  0x1C
-#define KINTERRUPT_IRQL                         0x20
 #define KINTERRUPT_VECTOR                       0x24
+#define KINTERRUPT_IRQL                         0x28
 #define KINTERRUPT_SYNCHRONIZE_IRQL             0x29
 #define KINTERRUPT_DISPATCH_COUNT               0x38
 
diff --git a/reactos/ntoskrnl/include/internal/i386/asmmacro.S b/reactos/ntoskrnl/include/internal/i386/asmmacro.S
index d97adbec6f2..3d9ebf6636d 100644
--- a/reactos/ntoskrnl/include/internal/i386/asmmacro.S
+++ b/reactos/ntoskrnl/include/internal/i386/asmmacro.S
@@ -1334,7 +1334,7 @@ VfOvr_&Label:
     mov [edi+KINTERRUPT_TICK_COUNT], eax
     jmp VfRstDef_&Label
 
-.1:
+1:
     /* Check if the debugger is enabled */
     cmp byte ptr __KdDebuggerEnabled, 0
     jnz 1f
diff --git a/reactos/ntoskrnl/ke/i386/irqobj.c b/reactos/ntoskrnl/ke/i386/irqobj.c
index 282d195b820..1a417c8d0f3 100644
--- a/reactos/ntoskrnl/ke/i386/irqobj.c
+++ b/reactos/ntoskrnl/ke/i386/irqobj.c
@@ -281,13 +281,17 @@ KeConnectInterrupt(IN PKINTERRUPT Interrupt)
                 (Dispatch.Interrupt->Mode == Interrupt->Mode))
         {
             /* The vector is shared and the interrupts are compatible */
-            ASSERT(FALSE); // FIXME: NOT YET SUPPORTED/TESTED
             Interrupt->Connected = Connected = TRUE;
-            ASSERT(Irql <= SYNCH_LEVEL);
+
+            /* FIXME */
+            // ASSERT(Irql <= SYNCH_LEVEL);
 
             /* Check if this is the first chain */
             if (Dispatch.Type != ChainConnect)
             {
+                /* This is not supported */
+                ASSERT(Dispatch.Interrupt->Mode != Latched);
+
                 /* Setup the chainned handler */
                 KiConnectVectorToInterrupt(Dispatch.Interrupt, ChainConnect);
             }
diff --git a/reactos/ntoskrnl/ke/i386/trap.s b/reactos/ntoskrnl/ke/i386/trap.s
index d438650c2f3..95a97a69e31 100644
--- a/reactos/ntoskrnl/ke/i386/trap.s
+++ b/reactos/ntoskrnl/ke/i386/trap.s
@@ -2533,8 +2533,81 @@ TRAP_FIXUPS kit_a, kit_t, DoFixupV86, DoFixupAbios
 .func KiChainedDispatch2ndLvl@0
 _KiChainedDispatch2ndLvl@0:
 
-    /* Not yet supported */
-    UNHANDLED_PATH
+NextSharedInt:
+    /* Raise IRQL if necessary */
+    mov cl, [edi+KINTERRUPT_SYNCHRONIZE_IRQL]
+    cmp cl, [edi+KINTERRUPT_IRQL]
+    je 1f
+    call @KfRaiseIrql@4
+
+1:
+    /* Acquire the lock */
+    mov esi, [edi+KINTERRUPT_ACTUAL_LOCK]
+GetIntLock2:
+    ACQUIRE_SPINLOCK(esi, IntSpin2)
+
+    /* Make sure that this interrupt isn't storming */
+    VERIFY_INT kid2
+
+    /* Save the tick count */
+    mov esi, _KeTickCount
+
+    /* Call the ISR */
+    mov eax, [edi+KINTERRUPT_SERVICE_CONTEXT]
+    push eax
+    push edi
+    call [edi+KINTERRUPT_SERVICE_ROUTINE]
+
+    /* Save the ISR result */
+    mov bl, al
+
+    /* Check if the ISR timed out */
+    add esi, _KiISRTimeout
+    cmp _KeTickCount, esi
+    jnc ChainedIsrTimeout
+
+ReleaseLock2:
+    /* Release the lock */
+    mov esi, [edi+KINTERRUPT_ACTUAL_LOCK]
+    RELEASE_SPINLOCK(esi)
+
+    /* Lower IRQL if necessary */
+    mov cl, [edi+KINTERRUPT_IRQL]
+    cmp cl, [edi+KINTERRUPT_SYNCHRONIZE_IRQL]
+    je 1f
+    call @KfLowerIrql@4
+
+1:
+    /* Check if the interrupt is handled */
+    or bl, bl
+    jnz 1f
+
+    /* Try the next shared interrupt handler */
+    mov eax, [edi+KINTERRUPT_INTERRUPT_LIST_HEAD]
+    lea edi, [eax-KINTERRUPT_INTERRUPT_LIST_HEAD]
+    jmp NextSharedInt
+
+1:
+    ret
+
+#ifdef CONFIG_SMP
+IntSpin2:
+    SPIN_ON_LOCK(esi, GetIntLock2)
+#endif
+
+ChainedIsrTimeout:
+    /* Print warning message */
+    push [edi+KINTERRUPT_SERVICE_ROUTINE]
+    push offset _IsrTimeoutMsg
+    call _DbgPrint
+    add esp,8
+
+    /* Break into debugger, then continue */
+    int 3
+    jmp ReleaseLock2
+
+    /* Cleanup verification */
+    VERIFY_INT_END kid2, 0
 .endfunc
 
 .func KiChainedDispatch@0
@@ -2599,8 +2672,8 @@ _KiInterruptDispatch@0:
     jz SpuriousInt
 
     /* Acquire the lock */
-GetIntLock:
     mov esi, [edi+KINTERRUPT_ACTUAL_LOCK]
+GetIntLock:
     ACQUIRE_SPINLOCK(esi, IntSpin)
 
     /* Make sure that this interrupt isn't storming */