diff --git a/Machines/Apple/AppleII/Joystick.hpp b/Machines/Apple/AppleII/Joystick.hpp
index 33c517414..33f943c54 100644
--- a/Machines/Apple/AppleII/Joystick.hpp
+++ b/Machines/Apple/AppleII/Joystick.hpp
@@ -63,8 +63,8 @@ class JoystickPair {
 			return (1.0f - static_cast<Joystick *>(joysticks_[channel >> 1].get())->axes[channel & 1]) < analogue_charge_ + analogue_biases_[channel];
 		}
 
-		inline void update_charge() {
-			analogue_charge_ = std::min(analogue_charge_ + 1.0f / 2820.0f, 1.1f);
+		inline void update_charge(float one_mhz_cycles = 1.0f) {
+			analogue_charge_ = std::min(analogue_charge_ + one_mhz_cycles * (1.0f / 2820.0f), 1.1f);
 		}
 
 		inline void access_c070() {
diff --git a/Machines/Apple/AppleIIgs/AppleIIgs.cpp b/Machines/Apple/AppleIIgs/AppleIIgs.cpp
index 50234875d..f89905511 100644
--- a/Machines/Apple/AppleIIgs/AppleIIgs.cpp
+++ b/Machines/Apple/AppleIIgs/AppleIIgs.cpp
@@ -10,14 +10,15 @@
 
 #include "../../../Activity/Source.hpp"
 #include "../../MachineTypes.hpp"
-#include "../../../Processors/65816/65816.hpp"
 
 #include "../../../Analyser/Static/AppleIIgs/Target.hpp"
+
 #include "ADB.hpp"
 #include "MemoryMap.hpp"
 #include "Video.hpp"
 #include "Sound.hpp"
 
+#include "../../../Processors/65816/65816.hpp"
 #include "../../../Components/8530/z8530.hpp"
 #include "../../../Components/AppleClock/AppleClock.hpp"
 #include "../../../Components/AudioToggle/AudioToggle.hpp"
@@ -25,6 +26,8 @@
 #include "../../../Components/DiskII/MacintoshDoubleDensityDrive.hpp"
 #include "../../../Components/DiskII/DiskIIDrive.hpp"
 
+#include "../AppleII/Joystick.hpp"
+
 #include "../../../Outputs/Speaker/Implementation/CompoundSource.hpp"
 #include "../../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
 
@@ -37,7 +40,7 @@
 
 namespace {
 
-constexpr int CLOCK_RATE = 14318180;
+constexpr int CLOCK_RATE = 14'318'180;
 
 }
 
@@ -48,11 +51,12 @@ class ConcreteMachine:
 	public Activity::Source,
 	public Apple::IIgs::Machine,
 	public MachineTypes::AudioProducer,
+	public MachineTypes::JoystickMachine,
+	public MachineTypes::MappedKeyboardMachine,
 	public MachineTypes::MediaTarget,
+	public MachineTypes::MouseMachine,
 	public MachineTypes::ScanProducer,
 	public MachineTypes::TimedMachine,
-	public MachineTypes::MappedKeyboardMachine,
-	public MachineTypes::MouseMachine,
 	public CPU::MOS6502Esque::BusHandler<uint32_t> {
 
 	public:
@@ -516,32 +520,34 @@ class ConcreteMachine:
 						*value = rom_[rom_.size() - 65536 + address_suffix];
 					break;
 
-					// Analogue inputs. Joystick parts are TODO.
+					// Analogue inputs.
 					case Read(0xc061):
-						*value = adb_glu_->get_command_button() ? 0x80 : 0x00;
+						*value = (adb_glu_->get_command_button() || joysticks_.button(0)) ? 0x80 : 0x00;
 						is_1Mhz = true;
 					break;
 
 					case Read(0xc062):
-						*value = adb_glu_->get_option_button() ? 0x80 : 0x00;
+						*value = (adb_glu_->get_option_button() || joysticks_.button(1)) ? 0x80 : 0x00;
 						is_1Mhz = true;
 					break;
 
-					case Read(0xc060):
 					case Read(0xc063):
-						// Joystick buttons.
-						*value = 0x00;
+						*value = joysticks_.button(2) ? 0x80 : 0x00;
 						is_1Mhz = true;
 					break;
 
-					case Read(0xc064): case Read(0xc065): case Read(0xc066): case Read(0xc067):
+					case Read(0xc064):
+					case Read(0xc065):
+					case Read(0xc066):
+					case Read(0xc067): {
 						// Analogue inputs.
-						*value = 0x00;
+						const size_t input = address_suffix - 0xc064;
+						*value = joysticks_.analogue_channel_is_discharged(input) ? 0x00 : 0x80;
 						is_1Mhz = true;
-					break;
+					} break;
 
 					case Read(0xc070): case Write(0xc070):
-						// TODO: begin analogue channel charge.
+						joysticks_.access_c070();
 						is_1Mhz = true;
 					break;
 
@@ -904,6 +910,8 @@ class ConcreteMachine:
 				}
 			}
 
+			joysticks_.update_charge(duration.as<float>() / 14.0f);
+
 			return duration;
 		}
 
@@ -930,6 +938,10 @@ class ConcreteMachine:
 			return adb_glu_.last_valid()->get_mouse();
 		}
 
+		const std::vector<std::unique_ptr<Inputs::Joystick>> &get_joysticks() final {
+			return joysticks_.get_joysticks();
+		}
+
 	private:
 		CPU::WDC65816::Processor<ConcreteMachine, false> m65816_;
 		MemoryMap memory_;
@@ -986,8 +998,9 @@ class ConcreteMachine:
 		};
 		friend AudioUpdater;
 
-		// MARK: - Keyboard.
+		// MARK: - Keyboard and joystick.
 		Apple::ADB::KeyboardMapper keyboard_mapper_;
+		Apple::II::JoystickPair joysticks_;
 
 		// MARK: - Cards.
 
diff --git a/OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme b/OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme
index 324ac6bb0..aa72d51d7 100644
--- a/OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme	
+++ b/OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme	
@@ -62,7 +62,7 @@
       </Testables>
    </TestAction>
    <LaunchAction
-      buildConfiguration = "Debug"
+      buildConfiguration = "Release"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       enableAddressSanitizer = "YES"