diff --git a/extra/dragon/cmos.dr b/extra/dragon/cmos.dr
index 83fed24..a018243 100644
Binary files a/extra/dragon/cmos.dr and b/extra/dragon/cmos.dr differ
diff --git a/extra/dss/DragonOS/kernel0/memory.dss b/extra/dss/DragonOS/kernel0/memory.dss
index 222561a..31899b9 100644
--- a/extra/dss/DragonOS/kernel0/memory.dss
+++ b/extra/dss/DragonOS/kernel0/memory.dss
@@ -1,7 +1,16 @@
 @guard _MEMORY_DSS_
 
+@define _REG_OFFSET 0x09
+@define _REG_S1 0x07
+@define _REG_S2 0x08
+
+@define _USABLE_MEM_START 0x353F
+@define _USABLE_MEM_SIZE 0xBAC0
+@define _MEM_TABLE_ADDR 0x30FF
+
 .code
 
 _init_memory_handler:
-	mov R6, 0xFAAA
-	ret
\ No newline at end of file
+	ret
+
+_alloc_memory:
\ No newline at end of file
diff --git a/extra/dss/bios/data.dss b/extra/dss/bios/data.dss
index 38c43a1..a01b343 100644
--- a/extra/dss/bios/data.dss
+++ b/extra/dss/bios/data.dss
@@ -32,6 +32,7 @@
 	SCREEN_WIDTH			{ MemoryAddresses.CMOS + 0x0007 }
 	SCREEN_HEIGHT			{ MemoryAddresses.CMOS + 0x0009 }
 	BOOT_DISK 				{ MemoryAddresses.CMOS + 0x0010 }
+	STACK_SIZE 				{ MemoryAddresses.CMOS + 0x0011 }
 
 	DISK_LIST 				{ MemoryAddresses.CMOS + 0x007E }
 @end
diff --git a/src/hardware/VirtualCPU.cpp b/src/hardware/VirtualCPU.cpp
index e47f3bc..28a0d0b 100644
--- a/src/hardware/VirtualCPU.cpp
+++ b/src/hardware/VirtualCPU.cpp
@@ -61,6 +61,13 @@ namespace dragon
 		void VirtualCPU::pushToStack(int16_t value)
 		{
 			uint16_t stackAddr = readRegister(data::Registers::SP);
+			uint16_t stack_size = DragonRuntime::vCMOS.read16(data::CMOSRegisters::StackSize);
+			if (stackAddr <= 0xFFFF - stack_size)
+			{
+				data::ErrorHandler::pushError(data::ErrorCodes::CPU_StackOverflow, "Stack Overflow: ");
+				m_halt = true;
+				return;
+			}
 			m_memory.write16(stackAddr, value);
 			writeRegister16(data::Registers::SP, stackAddr - 2);
 			m_stackFrameSize += 2;
diff --git a/src/runtime/DragonRuntime.cpp b/src/runtime/DragonRuntime.cpp
index c029760..92865e3 100644
--- a/src/runtime/DragonRuntime.cpp
+++ b/src/runtime/DragonRuntime.cpp
@@ -322,6 +322,7 @@ namespace dragon
 		vCMOS.write8(data::CMOSRegisters::ScreenRedrawRate, machine_config.screen_redraw_rate_per_second);
 		vCMOS.write16(data::CMOSRegisters::ScreenWidth, static_cast<int16_t>(RawTextRenderer::CONSOLE_CHARS_H));
 		vCMOS.write16(data::CMOSRegisters::ScreenHeight, static_cast<int16_t>(RawTextRenderer::CONSOLE_CHARS_V));
+		vCMOS.write16(data::CMOSRegisters::StackSize, 0x1000);
 		ostd::BitField_16 disk_list_bitfield;
 		disk_list_bitfield.value = 0;
 		for (int32_t i = 0; i < 16; i++)
diff --git a/src/tools/GlobalData.hpp b/src/tools/GlobalData.hpp
index 508560e..1f7a73a 100644
--- a/src/tools/GlobalData.hpp
+++ b/src/tools/GlobalData.hpp
@@ -20,6 +20,7 @@ namespace dragon
 
 				inline static constexpr uint64_t CPU_UnknownInstruction 			= 			0x2000000000000000;
 				inline static constexpr uint64_t CPU_UnsupportedExtension 			= 			0x2000000000000001;
+				inline static constexpr uint64_t CPU_StackOverflow		 			= 			0x2000000000000002;
 
 				inline static constexpr uint64_t BIOS_FailedToLoad 					= 			0x3000000000000000;
 				inline static constexpr uint64_t BIOS_InvalidSize 					= 			0x3000000000000001;
@@ -223,6 +224,7 @@ namespace dragon
 				inline static constexpr uint8_t ScreenWidth 		= 0x07;
 				inline static constexpr uint8_t ScreenHeight	 	= 0x09;
 				inline static constexpr uint8_t BootDisk	 		= 0x10;
+				inline static constexpr uint8_t StackSize	 		= 0x11;
 
 				inline static constexpr uint8_t DiskList	 		= 0x7E;
 		};