diff --git a/src/core/bios.cpp b/src/core/bios.cpp
index 8a1c348b9..c079c6df4 100644
--- a/src/core/bios.cpp
+++ b/src/core/bios.cpp
@@ -37,7 +37,7 @@ std::string Hash::ToString() const
   return str;
 }
 
-static constexpr std::array<ImageInfo, 27> s_image_infos = {{
+static constexpr std::array<ImageInfo, 26> s_image_infos = {{
   {"SCPH-1000, DTL-H1000 (v1.0)", ConsoleRegion::NTSC_J, MakeHashFromString("239665b1a3dade1b5a52c06338011044")},
   {"SCPH-1001, 5003, DTL-H1201, H3001 (v2.2 12-04-95 A)", ConsoleRegion::NTSC_U,
    MakeHashFromString("924e392ed05558ffdb115408c263dccf")},
@@ -75,8 +75,7 @@ static constexpr std::array<ImageInfo, 27> s_image_infos = {{
   {"SCPH-102 (v4.5 05-25-00 E)", ConsoleRegion::PAL, MakeHashFromString("de93caec13d1a141a40a79f5c86168d6")},
   {"PSP, SCPH-1000R (v4.5 05-25-00 J)", ConsoleRegion::Auto, MakeHashFromString("c53ca5908936d412331790f4426c6c33")},
   {"SCPH-1000R (v4.5 05-25-00 J)", ConsoleRegion::NTSC_J, MakeHashFromString("476d68a94ccec3b9c8303bbd1daf2810")},
-  {"PS3 (v5.0 06/23/03 A)", ConsoleRegion::Auto, MakeHashFromString("fbb5f59ec332451debccf1e377017237")},
-  {"PS3 (v5.0 06/23/03 A)", ConsoleRegion::Auto, MakeHashFromString("81bbe60ba7a3d1cea1d48c14cbcc647b")},
+  {"PS3 (v5.0 06-23-03 A)", ConsoleRegion::Auto, MakeHashFromString("81bbe60ba7a3d1cea1d48c14cbcc647b")}
 }};
 
 Hash GetHash(const Image& image)
diff --git a/src/core/bus.cpp b/src/core/bus.cpp
index 7b2b8f09a..aa01e9b05 100644
--- a/src/core/bus.cpp
+++ b/src/core/bus.cpp
@@ -625,10 +625,14 @@ ALWAYS_INLINE static TickCount DoEXP2Access(u32 offset, u32& value)
         m_tty_line_buffer += static_cast<char>(Truncate8(value));
       }
     }
-    else if (offset == 0x41)
+    else if (offset == 0x41 || offset == 0x42)
     {
       Log_WarningPrintf("BIOS POST status: %02X", value & UINT32_C(0x0F));
     }
+    else if (offset == 0x70)
+    {
+      Log_WarningPrintf("BIOS POST2 status: %02X", value & UINT32_C(0x0F));
+    }
     else
     {
       Log_WarningPrintf("EXP2 write: 0x%08X <- 0x%08X", EXP2_BASE | offset, value);
@@ -638,6 +642,40 @@ ALWAYS_INLINE static TickCount DoEXP2Access(u32 offset, u32& value)
   }
 }
 
+template<MemoryAccessType type>
+ALWAYS_INLINE static TickCount DoEXP3Access(u32 offset, u32& value)
+{
+  if constexpr (type == MemoryAccessType::Read)
+  {
+    Log_WarningPrintf("EXP3 read: 0x%08X -> 0x%08X", EXP3_BASE | offset);
+    value = UINT32_C(0xFFFFFFFF);
+
+    return 0;
+  }
+  else
+  {
+    if (offset == 0)
+      Log_WarningPrintf("BIOS POST3 status: %02X", value & UINT32_C(0x0F));
+
+    return 0;
+  }
+}
+
+template<MemoryAccessType type>
+ALWAYS_INLINE static TickCount DoUnknownEXPAccess(u32 address, u32& value)
+{
+  if constexpr (type == MemoryAccessType::Read)
+  {
+    Log_ErrorPrintf("Unknown EXP read: 0x%08X", address);
+    return -1;
+  }
+  else
+  {
+    Log_WarningPrintf("Unknown EXP write: 0x%08X <- 0x%08X", address, value);
+    return 0;
+  }
+}
+
 template<MemoryAccessType type, MemoryAccessSize size>
 ALWAYS_INLINE static TickCount DoMemoryControlAccess(u32 offset, u32& value)
 {
@@ -1289,6 +1327,14 @@ static ALWAYS_INLINE TickCount DoMemoryAccess(VirtualMemoryAddress address, u32&
   {
     return DoEXP2Access<type, size>(address & EXP2_MASK, value);
   }
+  else if (address < EXP3_BASE)
+  {
+    return DoUnknownEXPAccess<type>(address, value);
+  }
+  else if (address < (EXP3_BASE + EXP3_SIZE))
+  {
+    return DoEXP3Access<type>(address & EXP3_MASK, value);
+  }
   else
   {
     return DoInvalidAccess(type, size, address, value);
diff --git a/src/core/bus.h b/src/core/bus.h
index 4be96a83b..05982edd0 100644
--- a/src/core/bus.h
+++ b/src/core/bus.h
@@ -56,6 +56,9 @@ enum : u32
   EXP2_BASE = 0x1F802000,
   EXP2_SIZE = 0x2000,
   EXP2_MASK = EXP2_SIZE - 1,
+  EXP3_BASE = 0x1FA00000,
+  EXP3_SIZE = 0x1,
+  EXP3_MASK = EXP3_SIZE - 1,
   BIOS_BASE = 0x1FC00000,
   BIOS_SIZE = 0x80000,
   BIOS_MASK = 0x7FFFF,