diff --git a/Machines/Oric/Microdisc.cpp b/Machines/Oric/Microdisc.cpp
index a9701967e..a19966c30 100644
--- a/Machines/Oric/Microdisc.cpp
+++ b/Machines/Oric/Microdisc.cpp
@@ -22,10 +22,11 @@ Microdisc::Microdisc() : WD1770(P1793) {
 	set_control_register(last_control_, 0xff);
 }
 
-void Microdisc::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive) {
+void Microdisc::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, size_t drive) {
 	if(!drives_[drive]) {
 		drives_[drive].reset(new Storage::Disk::Drive(8000000, 300, 2));
 		if(drive == selected_drive_) set_drive(drives_[drive]);
+		drives_[drive]->set_activity_observer(observer_, "Drive" + std::to_string(drive), false);
 	}
 	drives_[drive]->set_disk(disk);
 }
@@ -48,8 +49,8 @@ void Microdisc::set_control_register(uint8_t control, uint8_t changes) {
 	// b4: side select
 	if(changes & 0x10) {
 		int head = (control & 0x10) ? 1 : 0;
-		for(int c = 0; c < 4; c++) {
-			if(drives_[c]) drives_[c]->set_head(head);
+		for(auto &drive : drives_) {
+			if(drive) drive->set_head(head);
 		}
 	}
 
@@ -89,10 +90,12 @@ uint8_t Microdisc::get_data_request_register() {
 }
 
 void Microdisc::set_head_load_request(bool head_load) {
+	head_load_request_ = head_load;
+
 	// The drive motors (at present: I believe **all drive motors** regardless of the selected drive) receive
 	// the current head load request state.
-	for(int c = 0; c < 4; c++) {
-		if(drives_[c]) drives_[c]->set_motor_on(head_load);
+	for(auto &drive : drives_) {
+		if(drive) drive->set_motor_on(head_load);
 	}
 
 	// A request to load the head results in a delay until the head is confirmed loaded. This delay is handled
@@ -103,6 +106,10 @@ void Microdisc::set_head_load_request(bool head_load) {
 		head_load_request_counter_ = head_load_request_counter_target;
 		set_head_loaded(head_load);
 	}
+
+	if(observer_) {
+		observer_->set_led_status("Microdisc", head_load);
+	}
 }
 
 void Microdisc::run_for(const Cycles cycles) {
@@ -116,3 +123,16 @@ void Microdisc::run_for(const Cycles cycles) {
 bool Microdisc::get_drive_is_ready() {
 	return true;
 }
+
+void Microdisc::set_activity_observer(Activity::Observer *observer) {
+	observer_ = observer;
+	if(observer) {
+		observer->register_led("Microdisc");
+		observer_->set_led_status("Microdisc", head_load_request_);
+	}
+	size_t c = 0;
+	for(auto &drive : drives_) {
+		if(drive) drive->set_activity_observer(observer, "Drive" + std::to_string(c), false);
+		++c;
+	}
+}
diff --git a/Machines/Oric/Microdisc.hpp b/Machines/Oric/Microdisc.hpp
index 1ea325dc7..f8e847ff3 100644
--- a/Machines/Oric/Microdisc.hpp
+++ b/Machines/Oric/Microdisc.hpp
@@ -10,6 +10,9 @@
 #define Microdisc_hpp
 
 #include "../../Components/1770/1770.hpp"
+#include "../../Activity/Observer.hpp"
+
+#include <array>
 
 namespace Oric {
 
@@ -17,7 +20,7 @@ class Microdisc: public WD::WD1770 {
 	public:
 		Microdisc();
 
-		void set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive);
+		void set_disk(std::shared_ptr<Storage::Disk::Disk> disk, size_t drive);
 		void set_control_register(uint8_t control);
 		uint8_t get_interrupt_request_register();
 		uint8_t get_data_request_register();
@@ -39,17 +42,21 @@ class Microdisc: public WD::WD1770 {
 		inline void set_delegate(Delegate *delegate)	{	delegate_ = delegate;	WD1770::set_delegate(delegate);	}
 		inline int get_paging_flags()					{	return paging_flags_;									}
 
+		void set_activity_observer(Activity::Observer *observer);
+
 	private:
 		void set_control_register(uint8_t control, uint8_t changes);
 		void set_head_load_request(bool head_load);
 		bool get_drive_is_ready();
-		std::shared_ptr<Storage::Disk::Drive> drives_[4];
-		int selected_drive_;
+		std::array<std::shared_ptr<Storage::Disk::Drive>, 4> drives_;
+		size_t selected_drive_;
 		bool irq_enable_ = false;
 		int paging_flags_ = BASICDisable;
 		int head_load_request_counter_ = -1;
+		bool head_load_request_ = false;
 		Delegate *delegate_ = nullptr;
 		uint8_t last_control_ = 0;
+		Activity::Observer *observer_ = nullptr;
 };
 
 }
diff --git a/Machines/Oric/Oric.cpp b/Machines/Oric/Oric.cpp
index c5a8492a9..b1d8b0a2e 100644
--- a/Machines/Oric/Oric.cpp
+++ b/Machines/Oric/Oric.cpp
@@ -12,6 +12,7 @@
 #include "Microdisc.hpp"
 #include "Video.hpp"
 
+#include "../../Activity/Source.hpp"
 #include "../ConfigurationTarget.hpp"
 #include "../CRTMachine.hpp"
 #include "../KeyboardMachine.hpp"
@@ -200,6 +201,7 @@ template <Analyser::Static::Oric::Target::DiskInterface disk_interface> class Co
 	public Utility::TypeRecipient,
 	public Storage::Tape::BinaryTapePlayer::Delegate,
 	public Microdisc::Delegate,
+	public Activity::Source,
 	public Machine {
 
 	public:
@@ -329,10 +331,10 @@ template <Analyser::Static::Oric::Target::DiskInterface disk_interface> class Co
 				switch(disk_interface) {
 					case Analyser::Static::Oric::Target::DiskInterface::Microdisc: {
 						inserted = true;
-						int drive_index = 0;
+						size_t drive_index = 0;
 						for(auto &disk : media.disks) {
 							if(drive_index < 4) microdisc_.set_disk(disk, drive_index);
-							drive_index++;
+							++drive_index;
 						}
 					} break;
 					case Analyser::Static::Oric::Target::DiskInterface::Pravetz: {
@@ -340,7 +342,7 @@ template <Analyser::Static::Oric::Target::DiskInterface disk_interface> class Co
 						int drive_index = 0;
 						for(auto &disk : media.disks) {
 							if(drive_index < 2) diskii_.set_disk(disk, drive_index);
-							drive_index++;
+							++drive_index;
 						}
 					} break;
 
@@ -551,6 +553,18 @@ template <Analyser::Static::Oric::Target::DiskInterface disk_interface> class Co
 			return selection_set;
 		}
 
+		void set_activity_observer(Activity::Observer *observer) override {
+			switch(disk_interface) {
+				default: break;
+				case Analyser::Static::Oric::Target::DiskInterface::Microdisc:
+					microdisc_.set_activity_observer(observer);
+				break;
+				case Analyser::Static::Oric::Target::DiskInterface::Pravetz:
+					diskii_.set_activity_observer(observer);
+				break;
+			}
+		}
+
 	private:
 		const uint16_t basic_invisible_ram_top_ = 0xffff;
 		const uint16_t basic_visible_ram_top_ = 0xbfff;