diff --git a/CMakeLists.txt b/CMakeLists.txt
index 587e48c7..1d738a67 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,6 +53,7 @@ set(KERNEL_SOURCE_FILES src/core/kernel/kernel.cpp src/core/kernel/resource_limi
 set(SERVICE_SOURCE_FILES src/core/services/service_manager.cpp src/core/services/apt.cpp src/core/services/hid.cpp
                          src/core/services/fs.cpp src/core/services/gsp_gpu.cpp src/core/services/gsp_lcd.cpp
 )
+set(PICA_SOURCE_FILES src/core/PICA/gpu.cpp)
 
 set(HEADER_FILES include/emulator.hpp include/helpers.hpp include/opengl.hpp include/termcolor.hpp
                  include/cpu.hpp include/cpu_dynarmic.hpp include/memory.hpp include/kernel/kernel.hpp
@@ -60,6 +61,7 @@ set(HEADER_FILES include/emulator.hpp include/helpers.hpp include/opengl.hpp inc
                  include/kernel/config_mem.hpp include/services/service_manager.hpp include/services/apt.hpp
                  include/kernel/handles.hpp include/services/hid.hpp include/services/fs.hpp
                  include/services/gsp_gpu.hpp include/services/gsp_lcd.hpp include/arm_defs.hpp
+                 include/gpu.hpp
 )
 
 set(THIRD_PARTY_SOURCE_FILES third_party/imgui/imgui.cpp
@@ -75,7 +77,9 @@ source_group("Header Files\\Core" FILES ${HEADER_FILES})
 source_group("Source Files\\Core" FILES ${SOURCE_FILES})
 source_group("Source Files\\Core\\Kernel" FILES ${KERNEL_SOURCE_FILES})
 source_group("Source Files\\Core\\Services" FILES ${SERVICE_SOURCE_FILES})
+source_group("Source Files\\Core\\PICA" FILES ${PICA_SOURCE_FILES})
 source_group("Source Files\\Third Party" FILES ${THIRD_PARTY_SOURCE_FILES})
 
-add_executable(Alber ${SOURCE_FILES} ${KERNEL_SOURCE_FILES} ${SERVICE_SOURCE_FILES} ${THIRD_PARTY_SOURCE_FILES} ${HEADER_FILES})
+add_executable(Alber ${SOURCE_FILES} ${KERNEL_SOURCE_FILES} ${SERVICE_SOURCE_FILES} ${PICA_SOURCE_FILES}
+${THIRD_PARTY_SOURCE_FILES} ${HEADER_FILES})
 target_link_libraries(Alber PRIVATE sfml-system sfml-network sfml-graphics sfml-window dynarmic)
\ No newline at end of file
diff --git a/include/emulator.hpp b/include/emulator.hpp
index 438e2053..a3821d7f 100644
--- a/include/emulator.hpp
+++ b/include/emulator.hpp
@@ -4,7 +4,8 @@
 #include <fstream>
 
 #include "cpu.hpp"
-#include "helpers.hpp"
+#include "gpu.hpp"
+#include "memory.hpp"
 #include "opengl.hpp"
 #include "SFML/Window.hpp"
 #include "SFML/Graphics.hpp"
@@ -15,6 +16,7 @@ enum class ROMType {
 
 class Emulator {
     CPU cpu;
+    GPU gpu;
     Memory memory;
     Kernel kernel;
 
@@ -28,7 +30,7 @@ class Emulator {
 
 public:
     Emulator() : window(sf::VideoMode(width, height), "Alber", sf::Style::Default, sf::ContextSettings(0, 0, 0, 4, 3)),
-                 kernel(cpu, memory), cpu(memory, kernel) {
+                 kernel(cpu, memory, gpu), cpu(memory, kernel) {
         reset();
         window.setActive(true);
     }
diff --git a/include/gpu.hpp b/include/gpu.hpp
new file mode 100644
index 00000000..c62ff991
--- /dev/null
+++ b/include/gpu.hpp
@@ -0,0 +1,10 @@
+#pragma once
+#include "helpers.hpp"
+
+class GPU {
+
+public:
+	GPU() {}
+	void clearBuffer(u32 startAddress, u32 endAddress, u32 value, u32 control);
+	void reset();
+};
\ No newline at end of file
diff --git a/include/kernel/kernel.hpp b/include/kernel/kernel.hpp
index 39c6e08f..20a28657 100644
--- a/include/kernel/kernel.hpp
+++ b/include/kernel/kernel.hpp
@@ -100,7 +100,7 @@ class Kernel {
 	void waitSynchronization1();
 
 public:
-	Kernel(CPU& cpu, Memory& mem);
+	Kernel(CPU& cpu, Memory& mem, GPU& gpu);
 	void serviceSVC(u32 svc);
 	void reset();
 };
\ No newline at end of file
diff --git a/include/services/gsp_gpu.hpp b/include/services/gsp_gpu.hpp
index a456410d..e4b2eb35 100644
--- a/include/services/gsp_gpu.hpp
+++ b/include/services/gsp_gpu.hpp
@@ -1,8 +1,9 @@
 #pragma once
+#include <cstring>
+#include "gpu.hpp"
 #include "helpers.hpp"
 #include "kernel_types.hpp"
 #include "memory.hpp"
-#include <cstring>
 
 enum class GPUInterrupt : u8 {
 	PSC0 = 0, // Memory fill completed
@@ -17,6 +18,7 @@ enum class GPUInterrupt : u8 {
 class GPUService {
 	Handle handle = KernelHandles::GPU;
 	Memory& mem;
+	GPU& gpu;
 	u32& currentPID; // Process ID of the current process
 	u8* sharedMem; // Pointer to GSP shared memory
 
@@ -24,16 +26,22 @@ class GPUService {
 	// This is the PID of that process
 	u32 privilegedProcess;
 
+	void processCommands();
+
 	// Service commands
 	void acquireRight(u32 messagePointer);
 	void flushDataCache(u32 messagePointer);
 	void registerInterruptRelayQueue(u32 messagePointer);
 	void setLCDForceBlack(u32 messagePointer);
+	void triggerCmdReqQueue(u32 messagePointer);
 	void writeHwRegs(u32 messagePointer);
 	void writeHwRegsWithMask(u32 messagePointer);
 
+	// GPU commands processed via TriggerCmdReqQueue
+	void memoryFill(u32* cmd);
+
 public:
-	GPUService(Memory& mem, u32& currentPID) : mem(mem), currentPID(currentPID) {}
+	GPUService(Memory& mem, GPU& gpu, u32& currentPID) : mem(mem), gpu(gpu), currentPID(currentPID) {}
 	void reset();
 	void handleSyncRequest(u32 messagePointer);
 	void requestInterrupt(GPUInterrupt type);
diff --git a/include/services/service_manager.hpp b/include/services/service_manager.hpp
index abf731c1..33c7a9d2 100644
--- a/include/services/service_manager.hpp
+++ b/include/services/service_manager.hpp
@@ -23,7 +23,7 @@ class ServiceManager {
 	void registerClient(u32 messagePointer);
 
 public:
-	ServiceManager(std::array<u32, 16>& regs, Memory& mem, u32& currentPID);
+	ServiceManager(std::array<u32, 16>& regs, Memory& mem, GPU& gpu, u32& currentPID);
 	void reset();
 	void handleSyncRequest(u32 messagePointer);
 
diff --git a/src/core/PICA/gpu.cpp b/src/core/PICA/gpu.cpp
new file mode 100644
index 00000000..85c73384
--- /dev/null
+++ b/src/core/PICA/gpu.cpp
@@ -0,0 +1,10 @@
+#include "gpu.hpp"
+#include <cstdio>
+
+void GPU::reset() {
+
+}
+
+void GPU::clearBuffer(u32 startAddress, u32 endAddress, u32 value, u32 control) {
+	printf("GPU: Clear buffer\nStart: %08X End: %08X\nValue: %08X Control: %08X\n", startAddress, endAddress, value, control);
+}
\ No newline at end of file
diff --git a/src/core/kernel/kernel.cpp b/src/core/kernel/kernel.cpp
index 9a1cc09b..74fce4a6 100644
--- a/src/core/kernel/kernel.cpp
+++ b/src/core/kernel/kernel.cpp
@@ -3,8 +3,8 @@
 #include "kernel_types.hpp"
 #include "cpu.hpp"
 
-Kernel::Kernel(CPU& cpu, Memory& mem)
-	: cpu(cpu), regs(cpu.regs()), mem(mem), handleCounter(0), serviceManager(regs, mem, currentProcess) {
+Kernel::Kernel(CPU& cpu, Memory& mem, GPU& gpu)
+	: cpu(cpu), regs(cpu.regs()), mem(mem), handleCounter(0), serviceManager(regs, mem, gpu, currentProcess) {
 	objects.reserve(512); // Make room for a few objects to avoid further memory allocs later
 	portHandles.reserve(32);
 
diff --git a/src/core/services/gsp_gpu.cpp b/src/core/services/gsp_gpu.cpp
index 3741a536..9d5d9ace 100644
--- a/src/core/services/gsp_gpu.cpp
+++ b/src/core/services/gsp_gpu.cpp
@@ -1,13 +1,22 @@
 #include "services/gsp_gpu.hpp"
 
-namespace GPUCommands {
+// Commands used with SendSyncRequest targetted to the GSP::GPU service
+namespace ServiceCommands {
 	enum : u32 {
 		AcquireRight = 0x00160042,
 		RegisterInterruptRelayQueue = 0x00130042,
 		WriteHwRegs = 0x00010082,
 		WriteHwRegsWithMask = 0x00020084,
 		FlushDataCache = 0x00080082,
-		SetLCDForceBlack = 0x000B0040
+		SetLCDForceBlack = 0x000B0040,
+		TriggerCmdReqQueue = 0x000C0000
+	};
+}
+
+// Commands written to shared memory and processed by TriggerCmdReqQueue
+namespace GPUCommands {
+	enum : u32 {
+		MemoryFill = 2
 	};
 }
 
@@ -26,12 +35,13 @@ void GPUService::reset() {
 void GPUService::handleSyncRequest(u32 messagePointer) {
 	const u32 command = mem.read32(messagePointer);
 	switch (command) {
-		case GPUCommands::AcquireRight: acquireRight(messagePointer); break;
-		case GPUCommands::FlushDataCache: flushDataCache(messagePointer); break;
-		case GPUCommands::RegisterInterruptRelayQueue: registerInterruptRelayQueue(messagePointer); break;
-		case GPUCommands::SetLCDForceBlack: setLCDForceBlack(messagePointer); break;
-		case GPUCommands::WriteHwRegs: writeHwRegs(messagePointer); break;
-		case GPUCommands::WriteHwRegsWithMask: writeHwRegsWithMask(messagePointer); break;
+		case ServiceCommands::AcquireRight: acquireRight(messagePointer); break;
+		case ServiceCommands::FlushDataCache: flushDataCache(messagePointer); break;
+		case ServiceCommands::RegisterInterruptRelayQueue: registerInterruptRelayQueue(messagePointer); break;
+		case ServiceCommands::SetLCDForceBlack: setLCDForceBlack(messagePointer); break;
+		case ServiceCommands::TriggerCmdReqQueue: triggerCmdReqQueue(messagePointer); break;
+		case ServiceCommands::WriteHwRegs: writeHwRegs(messagePointer); break;
+		case ServiceCommands::WriteHwRegsWithMask: writeHwRegsWithMask(messagePointer); break;
 ;		default: Helpers::panic("GPU service requested. Command: %08X\n", command);
 	}
 }
@@ -58,6 +68,11 @@ void GPUService::acquireRight(u32 messagePointer) {
 // What is the "GSP module thread index" meant to be?
 // How does the shared memory handle thing work?
 void GPUService::registerInterruptRelayQueue(u32 messagePointer) {
+	// Detect if this function is called a 2nd time because we'll likely need to impl threads properly for the GSP
+	static bool beenHere = false;
+	if (beenHere) Helpers::panic("RegisterInterruptRelayQueue called a second time. Need to implement GSP threads properly");
+	beenHere = true;
+
 	const u32 flags = mem.read32(messagePointer + 4);
 	const u32 eventHandle = mem.read32(messagePointer + 12);
 	printf("GSP::GPU::RegisterInterruptRelayQueue (flags = %X, event handle = %X)\n", flags, eventHandle);
@@ -73,7 +88,7 @@ void GPUService::requestInterrupt(GPUInterrupt type) {
 		return;
 	}
 
-	u8 index = sharedMem[0];
+	u8 index = sharedMem[0]; // The interrupt block is normally located at sharedMem + processGSPIndex*0x40
 	u8& interruptCount = sharedMem[1];
 	u8 flagIndex = (index + interruptCount) % 0x34;
 	interruptCount++;
@@ -168,4 +183,64 @@ void GPUService::setLCDForceBlack(u32 messagePointer) {
 	}
 
 	mem.write32(messagePointer + 4, Result::Success);
+}
+
+void GPUService::triggerCmdReqQueue(u32 messagePointer) {
+	processCommands();
+	mem.write32(messagePointer + 4, Result::Success);
+}
+
+#include <chrono>
+#include <thread>
+using namespace std::chrono_literals;
+void GPUService::processCommands() {
+	if (sharedMem == nullptr) [[unlikely]] { // Shared memory hasn't been set up yet
+		return;
+	}
+
+	constexpr int threadCount = 1; // TODO: More than 1 thread can have GSP commands at a time
+	for (int t = 0; t < threadCount; t++) {
+		u8* cmdBuffer = &sharedMem[0x800 + t * 0x200];
+		u8& commandsLeft = cmdBuffer[1];
+		// Commands start at byte 0x20 of the command buffer, each being 0x20 bytes long
+		u32* cmd = reinterpret_cast<u32*>(&cmdBuffer[0x20]);
+
+		printf("Processing %d GPU commands\n", commandsLeft);
+		std::this_thread::sleep_for(1000ms);
+
+		while (commandsLeft != 0) {
+			u32 cmdID = cmd[0] & 0xff;
+			switch (cmdID) {
+				case GPUCommands::MemoryFill: memoryFill(cmd); break;
+				default: Helpers::panic("GSP::GPU::ProcessCommands: Unknown cmd ID %d", cmdID);
+			}
+
+			commandsLeft--;
+		}
+	}	
+}
+
+// Fill 2 GPU framebuffers, buf0 and buf1, using a specific word value
+void GPUService::memoryFill(u32* cmd) {
+	u32 control = cmd[7];
+	
+	// buf0 parameters
+	u32 start0 = cmd[1]; // Start address for the fill. If 0, don't fill anything
+	u32 value0 = cmd[2]; // Value to fill the framebuffer with
+	u32 end0 = cmd[3];   // End address for the fill
+	u32 control0 = control & 0xffff;
+
+	// buf1 parameters
+	u32 start1 = cmd[4];
+	u32 value1 = cmd[5];
+	u32 end1 = cmd[6];
+	u32 control1 = control >> 16;
+
+	if (start0 != 0) {
+		gpu.clearBuffer(start0, end0, value0, control0);
+	}
+
+	if (start1 != 0) {
+		gpu.clearBuffer(start1, end1, value1, control1);
+	}
 }
\ No newline at end of file
diff --git a/src/core/services/service_manager.cpp b/src/core/services/service_manager.cpp
index 3524c8ca..aa4e9a5f 100644
--- a/src/core/services/service_manager.cpp
+++ b/src/core/services/service_manager.cpp
@@ -1,7 +1,7 @@
 #include "services/service_manager.hpp"
 
-ServiceManager::ServiceManager(std::array<u32, 16>& regs, Memory& mem, u32& currentPID)
-	: regs(regs), mem(mem), apt(mem), hid(mem), fs(mem), gsp_gpu(mem, currentPID), gsp_lcd(mem) {}
+ServiceManager::ServiceManager(std::array<u32, 16>& regs, Memory& mem, GPU& gpu, u32& currentPID)
+	: regs(regs), mem(mem), apt(mem), hid(mem), fs(mem), gsp_gpu(mem, gpu, currentPID), gsp_lcd(mem) {}
 
 void ServiceManager::reset() {
 	apt.reset();
diff --git a/src/emulator.cpp b/src/emulator.cpp
index 5eb7fd74..5e383537 100644
--- a/src/emulator.cpp
+++ b/src/emulator.cpp
@@ -1,8 +1,10 @@
 #include "emulator.hpp"
 
 void Emulator::reset() {
-    memory.reset();
     cpu.reset();
+    gpu.reset();
+    memory.reset();
+    // Kernel must be reset last because it depends on CPU/Memory state
     kernel.reset();
 
     // Reloading r13 and r15 needs to happen after everything has been reset