diff --git a/src/CxbxKrnl/EmuKrnl.cpp b/src/CxbxKrnl/EmuKrnl.cpp
index 4f40765ab..360e87bac 100644
--- a/src/CxbxKrnl/EmuKrnl.cpp
+++ b/src/CxbxKrnl/EmuKrnl.cpp
@@ -124,10 +124,157 @@ std::ostream& operator<<(std::ostream& os, const xboxkrnl::PLARGE_INTEGER& value
 
 using namespace xboxkrnl;
 
+/*
+XBSYSAPI EXPORTNUM(51) __fastcall xboxkrnl::InterlockedCompareExchange(
+{0 EAX}FASTCALL_FIX_ARGUMENT_TAKING_EAX: DWORD;
+{2 EDX}Exchange: LONG;
+{1 ECX}Destination: PLONG;
+{3 stack}Comparand: LONG
+): LONG; register; // fastcall simulation - See Translation guide
+// Source:ReactOS  Branch:Dxbx  Translator:PatrickvL  Done:100
+{
+if MayLog(lfUnit) then
+DbgPrintf('EmuKrnl : InterlockedCompareExchange' +
+#13#10'(' +
+#13#10'   Exchange           : 0x%.08X' +
+#13#10'   Destination        : 0x%.08X' +
+#13#10'   Comparand          : 0x%.08X' +
+#13#10');',
+[Exchange, Destination, Comparand]);
+
+  RETURN(InterlockedCompareExchange({var}Destination^, Exchange, Comparand);
+};
+
+XBSYSAPI EXPORTNUM(52) __fastcall xboxkrnl::InterlockedDecrement(
+{0 EAX}FASTCALL_FIX_ARGUMENT_TAKING_EAX: DWORD;
+{2 EDX}FASTCALL_FIX_ARGUMENT_TAKING_EDX: DWORD;
+{1 ECX}Addend: PLONG // OUT, volatile
+): LONG; register; // fastcall simulation - See Translation guide
+// Source:ReactOS  Branch:Dxbx  Translator:PatrickvL  Done:100
+{
+if MayLog(lfUnit) then
+DbgPrintf('EmuKrnl : InterlockedDecrement' +
+#13#10'(' +
+#13#10'   Addend             : 0x%.08X' +
+#13#10');',
+[Addend]);
+
+  RETURN(InterlockedDecrement({var}Addend^);
+};
+
+XBSYSAPI EXPORTNUM(53) __fastcall xboxkrnl::InterlockedIncrement(
+{0 EAX}FASTCALL_FIX_ARGUMENT_TAKING_EAX: DWORD;
+{2 EDX}FASTCALL_FIX_ARGUMENT_TAKING_EDX: DWORD;
+{1 ECX}Addend: PLONG // OUT, volatile
+): LONG; register; // fastcall simulation - See Translation guide
+// Source:ReactOS  Branch:Dxbx  Translator:PatrickvL  Done:100
+{
+if MayLog(lfUnit) then
+DbgPrintf('EmuKrnl : InterlockedIncrement' +
+#13#10'(' +
+#13#10'   Addend             : 0x%.08X' +
+#13#10');',
+[Addend]);
+
+  RETURN(InterlockedIncrement({var}Addend^);
+};
+
+XBSYSAPI EXPORTNUM(54) __fastcall xboxkrnl::InterlockedExchange(
+{0 EAX}FASTCALL_FIX_ARGUMENT_TAKING_EAX: DWORD;
+{2 EDX}Value: LONG;
+{1 ECX}Destination: PLONG
+): LONG; register; // fastcall simulation - See Translation guide
+// Source:ReactOS  Branch:Dxbx  Translator:PatrickvL  Done:100
+{
+if MayLog(lfUnit) then
+DbgPrintf('EmuKrnl : InterlockedExchange' +
+#13#10'(' +
+#13#10'   Value              : 0x%.08X' +
+#13#10'   Destination        : 0x%.08X' +
+#13#10');',
+[Value, Destination]);
+
+  RETURN(InterlockedExchange({var}Destination^, Value);
+};
+
+XBSYSAPI EXPORTNUM(55) __fastcall xboxkrnl::InterlockedExchangeAdd(
+{0 EAX}FASTCALL_FIX_ARGUMENT_TAKING_EAX: DWORD;
+{2 EDX}Value: LONG;
+{1 ECX}Addend: PLONG
+): LONG; register; // fastcall simulation - See Translation guide
+// Source:ReactOS  Branch:Dxbx  Translator:PatrickvL  Done:100
+{
+if MayLog(lfUnit) then
+DbgPrintf('EmuKrnl : InterlockedExchangeAdd' +
+#13#10'(' +
+#13#10'   Value              : 0x%.08X' +
+#13#10'   Addend             : 0x%.08X' +
+#13#10');',
+[Value, Addend]);
+
+  RETURN(InterlockedExchangeAdd({var}Addend^, Value);
+};
+
+// Dxbx Note : The Xbox1 SINGLE_LIST strucures are the same as in WinNT
+XBSYSAPI EXPORTNUM(56) __fastcall xboxkrnl::InterlockedFlushSList(
+{0 EAX}FASTCALL_FIX_ARGUMENT_TAKING_EAX: DWORD;
+{2 EDX}FASTCALL_FIX_ARGUMENT_TAKING_EDX: DWORD;
+{1 ECX}ListHead: PSLIST_HEADER
+): PSINGLE_LIST_ENTRY; register; // fastcall simulation - See Translation guide
+// Source:ReactOS  Branch:Dxbx  Translator:PatrickvL  Done:100
+{
+if MayLog(lfUnit) then
+DbgPrintf('EmuKrnl : InterlockedFlushSList' +
+#13#10'(' +
+#13#10'   ListHead           : 0x%.08X' +
+#13#10');',
+[ListHead]);
+
+  RETURN(InterlockedFlushSList(ListHead);
+};
+
+XBSYSAPI EXPORTNUM(57) __fastcall xboxkrnl::InterlockedPopEntrySList(
+{0 EAX}FASTCALL_FIX_ARGUMENT_TAKING_EAX: DWORD;
+{2 EDX}FASTCALL_FIX_ARGUMENT_TAKING_EDX: DWORD;
+{1 ECX}ListHead: PSLIST_HEADER
+): PSLIST_ENTRY; register; // fastcall simulation - See Translation guide
+// Source:ReactOS  Branch:Dxbx  Translator:PatrickvL  Done:100
+{
+if MayLog(lfUnit) then
+DbgPrintf('EmuKrnl : InterlockedPopEntrySList' +
+#13#10'(' +
+#13#10'   ListHead           : 0x%.08X' +
+#13#10');',
+[ListHead]);
+
+  RETURN(InterlockedPopEntrySList(ListHead);
+};
+
+XBSYSAPI EXPORTNUM(58) __fastcall xboxkrnl::InterlockedPushEntrySList(
+{0 EAX}FASTCALL_FIX_ARGUMENT_TAKING_EAX: DWORD;
+{2 EDX}ListEntry: PSLIST_ENTRY;
+{1 ECX}ListHead: PSLIST_HEADER
+): PSLIST_ENTRY; register; // fastcall simulation - See Translation guide
+// Source:ReactOS  Branch:Dxbx  Translator:PatrickvL  Done:100
+{
+if MayLog(lfUnit) then
+DbgPrintf('EmuKrnl : InterlockedPopEntrySList' +
+#13#10'(' +
+#13#10'   ListEntry          : 0x%.08X' +
+#13#10'   ListHead           : 0x%.08X' +
+#13#10');',
+[ListEntry, ListHead]);
+
+  RETURN(InterlockedPushEntrySList(ListHead, ListEntry);
+};
+*/
 
 // ******************************************************************
 // * 0x00A0 - KfRaiseIrql
 // ******************************************************************
+// Raises the hardware priority (irql)
+// NewIrql = Irql to raise to
+// RETURN VALUE previous irq level
 XBSYSAPI EXPORTNUM(160) xboxkrnl::UCHAR _fastcall xboxkrnl::KfRaiseIrql
 (
     IN UCHAR NewIrql
@@ -163,6 +310,8 @@ XBSYSAPI EXPORTNUM(160) xboxkrnl::UCHAR _fastcall xboxkrnl::KfRaiseIrql
 // ******************************************************************
 // * 0x00A1 - KfLowerIrql
 // ******************************************************************
+// Restores the irq level on the current processor
+// ARGUMENTS NewIrql = Irql to lower to
 XBSYSAPI EXPORTNUM(161) VOID _fastcall xboxkrnl::KfLowerIrql
 (
     IN UCHAR NewIrql
@@ -176,5 +325,79 @@ XBSYSAPI EXPORTNUM(161) VOID _fastcall xboxkrnl::KfLowerIrql
 // Source:ReactOS
 XBSYSAPI EXPORTNUM(162) xboxkrnl::ULONG_PTR xboxkrnl::KiBugCheckData[5] = { NULL, NULL, NULL, NULL, NULL };
 
+/*
+XBSYSAPI EXPORTNUM(163) xboxkrnl::KiUnlockDispatcherDatabase(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('KiUnlockDispatcherDatabase');
+  RETURN(S_OK;
+};
+
+XBSYSAPI EXPORTNUM(252) xboxkrnl::PhyGetLinkState(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('PhyGetLinkState');
+  RETURN(S_OK;
+};
+
+XBSYSAPI EXPORTNUM(253) xboxkrnl::PhyInitialize(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('PhyInitialize');
+  RETURN(S_OK;
+};
+*/
+
 // TODO : Determine size, structure & filling behind this
 XBSYSAPI EXPORTNUM(357) xboxkrnl::BYTE xboxkrnl::IdexChannelObject[0x100] = { };
+
+/*
+XBSYSAPI EXPORTNUM(367) xboxkrnl::UnknownAPI367(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('UnknownAPI367');
+  RETURN(S_OK;
+};
+
+XBSYSAPI EXPORTNUM(368) xboxkrnl::UnknownAPI368(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('UnknownAPI368');
+  RETURN(S_OK;
+};
+
+XBSYSAPI EXPORTNUM(369) xboxkrnl::UnknownAPI369(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('UnknownAPI369');
+  RETURN(S_OK;
+};
+
+XBSYSAPI EXPORTNUM(370} PROFILING XProfpControl(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('UnknownAPI370');
+  RETURN(S_OK;
+};
+
+XBSYSAPI EXPORTNUM(371} PROFILING XProfpGetData(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('UnknownAPI371');
+  RETURN(S_OK;
+};
+
+XBSYSAPI EXPORTNUM(372} PROFILING IrtClientInitFast(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('UnknownAPI372');
+  RETURN(S_OK;
+};
+
+XBSYSAPI EXPORTNUM(373} PROFILING IrtSweep(): NTSTATUS; stdcall;
+// Branch:Dxbx  Translator:PatrickvL  Done:0
+{
+Unimplemented('UnknownAPI373');
+  RETURN(S_OK;
+};
+*/
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