diff --git a/Source/Core/DiscIO/Volume.h b/Source/Core/DiscIO/Volume.h
index 7dfabb3e97..61df7e032f 100644
--- a/Source/Core/DiscIO/Volume.h
+++ b/Source/Core/DiscIO/Volume.h
@@ -126,6 +126,7 @@ public:
   }
   virtual Region GetRegion() const = 0;
   virtual Country GetCountry(const Partition& partition = PARTITION_NONE) const = 0;
+  virtual u32 GetSimulatedMemorySize() const = 0;
   virtual BlobType GetBlobType() const = 0;
   // Size of virtual disc (may be inaccurate depending on the blob type)
   virtual u64 GetDataSize() const = 0;
diff --git a/Source/Core/DiscIO/VolumeDisc.cpp b/Source/Core/DiscIO/VolumeDisc.cpp
index e842540376..4dd16c4cef 100644
--- a/Source/Core/DiscIO/VolumeDisc.cpp
+++ b/Source/Core/DiscIO/VolumeDisc.cpp
@@ -179,6 +179,14 @@ std::optional<u8> VolumeDisc::GetDiscNumber(const Partition& partition) const
   return ReadSwapped<u8>(6, partition);
 }
 
+u32 VolumeDisc::GetSimulatedMemorySize() const
+{
+  // Simulated memory size is a 32-bit unsigned integer in the `bi2.bin` file at offset `0x04`.
+  // Apploader reads this and "simulates" a smaller memory size. Originally useful for simulating
+  // 24 MiB of memory on devkits with 48 MiB.
+  return ReadSwapped<u32>(BI2_ADDRESS + 0x04, GetGamePartition()).value_or(0);
+}
+
 bool VolumeDisc::IsNKit() const
 {
   constexpr u32 NKIT_MAGIC = 0x4E4B4954;  // "NKIT"
diff --git a/Source/Core/DiscIO/VolumeDisc.h b/Source/Core/DiscIO/VolumeDisc.h
index f630522e68..1b3774a87d 100644
--- a/Source/Core/DiscIO/VolumeDisc.h
+++ b/Source/Core/DiscIO/VolumeDisc.h
@@ -47,6 +47,7 @@ public:
   std::string GetInternalName(const Partition& partition = PARTITION_NONE) const override;
   std::string GetApploaderDate(const Partition& partition) const override;
   std::optional<u8> GetDiscNumber(const Partition& partition = PARTITION_NONE) const override;
+  u32 GetSimulatedMemorySize() const override;
   bool IsNKit() const override;
 
 protected:
diff --git a/Source/Core/DiscIO/VolumeWad.h b/Source/Core/DiscIO/VolumeWad.h
index 2c383c0254..88a0847f80 100644
--- a/Source/Core/DiscIO/VolumeWad.h
+++ b/Source/Core/DiscIO/VolumeWad.h
@@ -61,6 +61,7 @@ public:
   bool IsNKit() const override;
   Region GetRegion() const override;
   Country GetCountry(const Partition& partition = PARTITION_NONE) const override;
+  u32 GetSimulatedMemorySize() const override { return 0; }
 
   BlobType GetBlobType() const override;
   u64 GetDataSize() const override;