@@ -24,6 +24,7 @@ BATTLECHIP_OK = 0xFFC6,
 	BATTLECHIP_CONTINUE = 0xFFFF,
 };
 
+static bool GBASIOBattlechipGateInit(struct GBASIODriver* driver);
 static bool GBASIOBattlechipGateLoad(struct GBASIODriver* driver);
 static uint16_t GBASIOBattlechipGateWriteRegister(struct GBASIODriver* driver, uint32_t address, uint16_t value);
 
@@ -31,7 +32,7 @@ static void _battlechipTransfer(struct GBASIOBattlechipGate* gate);
 static void _battlechipTransferEvent(struct mTiming* timing, void* user, uint32_t cyclesLate);
 
 void GBASIOBattlechipGateCreate(struct GBASIOBattlechipGate* gate) {
-	gate->d.init = NULL;
+	gate->d.init = GBASIOBattlechipGateInit;
 	gate->d.deinit = NULL;
 	gate->d.load = GBASIOBattlechipGateLoad;
 	gate->d.unload = NULL;
@@ -40,6 +41,12 @@
 	gate->event.context = gate;
 	gate->event.callback = _battlechipTransferEvent;
 	gate->event.priority = 0x80;
+}
+
+bool GBASIOBattlechipGateInit(struct GBASIODriver* driver) {
+	struct GBASIOBattlechipGate* gate = (struct GBASIOBattlechipGate*) driver;
+	gate->chipId = 0;
+	return true;
 }
 
 bool GBASIOBattlechipGateLoad(struct GBASIODriver* driver) {

@@ -0,0 +1,36 @@
+/* Copyright (c) 2013-2019 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "BattleChipView.h"
+
+#include "CoreController.h"
+
+using namespace QGBA;
+
+BattleChipView::BattleChipView(std::shared_ptr<CoreController> controller, QWidget* parent)
+	: QDialog(parent)
+	, m_controller(controller)
+{
+	m_ui.setupUi(this);
+
+	connect(m_ui.chipId, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), m_ui.inserted, [this]() {
+		m_ui.inserted->setChecked(Qt::Checked);
+		insertChip(true);
+	});
+	connect(m_ui.inserted, &QAbstractButton::toggled, this, &BattleChipView::insertChip);
+	connect(controller.get(), &CoreController::stopping, this, &QWidget::close);
+}
+
+BattleChipView::~BattleChipView() {
+	m_controller->detachBattleChipGate();
+}
+
+void BattleChipView::insertChip(bool inserted) {
+	if (inserted) {
+		m_controller->setBattleChipId(m_ui.chipId->value());
+	} else {
+		m_controller->setBattleChipId(0);
+	}
+}

@@ -0,0 +1,36 @@
+/* Copyright (c) 2013-2019 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#pragma once
+
+#include <QDialog>
+
+#include <memory>
+
+#include <mgba/core/interface.h>
+
+#include "ui_BattleChipView.h"
+
+namespace QGBA {
+
+class CoreController;
+
+class BattleChipView : public QDialog {
+Q_OBJECT
+
+public:
+	BattleChipView(std::shared_ptr<CoreController> controller, QWidget* parent = nullptr);
+	~BattleChipView();
+
+public slots:
+	void insertChip(bool);
+
+private:
+	Ui::BattleChipView m_ui;
+
+	std::shared_ptr<CoreController> m_controller;
+};
+
+}

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>BattleChipView</class>
+ <widget class="QDialog" name="BattleChipView">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>217</width>
+    <height>100</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>BattleChip Gate</string>
+  </property>
+  <layout class="QFormLayout" name="formLayout">
+   <item row="1" column="1">
+    <widget class="QCheckBox" name="inserted">
+     <property name="text">
+      <string>Inserted</string>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="0">
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>Chip ID</string>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="1">
+    <widget class="QSpinBox" name="chipId">
+     <property name="minimum">
+      <number>1</number>
+     </property>
+     <property name="maximum">
+      <number>65535</number>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

@@ -102,7 +102,6 @@ ObjView.cpp
 	OverrideView.cpp
 	PaletteView.cpp
 	PlacementControl.cpp
-	PrinterView.cpp
 	RegisterView.cpp
 	ROMInfo.cpp
 	RotatedHeaderView.cpp
@@ -124,6 +123,7 @@ set(UI_FILES
 	AboutScreen.ui
 	ArchiveInspector.ui
 	AssetTile.ui
+	BattleChipView.ui
 	CheatsView.ui
 	DebuggerConsole.ui
 	GIFView.ui
@@ -147,10 +147,12 @@ TileView.ui
 	VideoView.ui)
 
 set(GBA_SRC
+	BattleChipView.cpp
 	GBAOverride.cpp)
 
 set(GB_SRC
-	GBOverride.cpp)
+	GBOverride.cpp
+	PrinterView.cpp)
 
 set(QT_LIBRARIES)
 set(CPACK_DEBIAN_PACKAGE_DEPENDS "${CPACK_DEBIAN_PACKAGE_DEPENDS},libqt5widgets5,libqt5opengl5")

@@ -672,8 +672,8 @@ vf->close(vf);
 #endif
 }
 
-void CoreController::attachPrinter() {
 #ifdef M_CORE_GB
+void CoreController::attachPrinter() {
 	if (platform() != PLATFORM_GB) {
 		return;
 	}
@@ -703,11 +703,9 @@ QMetaObject::invokeMethod(qPrinter->parent, "imagePrinted", Q_ARG(const QImage&, image));
 	};
 	Interrupter interrupter(this);
 	GBSIOSetDriver(&gb->sio, &m_printer.d.d);
-#endif
 }
 
 void CoreController::detachPrinter() {
-#ifdef M_CORE_GB
 	if (platform() != PLATFORM_GB) {
 		return;
 	}
@@ -715,18 +713,44 @@ Interrupter interrupter(this);
 	GB* gb = static_cast<GB*>(m_threadContext.core->board);
 	GBPrinterDonePrinting(&m_printer.d);
 	GBSIOSetDriver(&gb->sio, nullptr);
-#endif
 }
 
 void CoreController::endPrint() {
-#ifdef M_CORE_GB
 	if (platform() != PLATFORM_GB) {
 		return;
 	}
 	Interrupter interrupter(this);
 	GBPrinterDonePrinting(&m_printer.d);
+}
 #endif
+
+#ifdef M_CORE_GBA
+void CoreController::attachBattleChipGate() {
+	if (platform() != PLATFORM_GBA) {
+		return;
+	}
+	Interrupter interrupter(this);
+	clearMultiplayerController();
+	GBASIOBattlechipGateCreate(&m_battlechip);
+	m_threadContext.core->setPeripheral(m_threadContext.core, mPERIPH_GBA_BATTLECHIP_GATE, &m_battlechip);
 }
+
+void CoreController::detachBattleChipGate() {
+	if (platform() != PLATFORM_GBA) {
+		return;
+	}
+	Interrupter interrupter(this);
+	m_threadContext.core->setPeripheral(m_threadContext.core, mPERIPH_GBA_BATTLECHIP_GATE, nullptr);
+}
+
+void CoreController::setBattleChipId(uint16_t id) {
+	if (platform() != PLATFORM_GBA) {
+		return;
+	}
+	Interrupter interrupter(this);
+	m_battlechip.chipId = id;
+}
+#endif
 
 void CoreController::setAVStream(mAVStream* stream) {
 	Interrupter interrupter(this);

@@ -25,6 +25,10 @@ #ifdef M_CORE_GB
 #include <mgba/internal/gb/sio/printer.h>
 #endif
 
+#ifdef M_CORE_GBA
+#include <mgba/gba/interface.h>
+#endif
+
 struct mCore;
 
 namespace QGBA {
@@ -129,9 +133,17 @@
 	void importSharkport(const QString& path);
 	void exportSharkport(const QString& path);
 
+#ifdef M_CORE_GB
 	void attachPrinter();
 	void detachPrinter();
 	void endPrint();
+#endif
+
+#ifdef M_CORE_GBA
+	void attachBattleChipGate();
+	void detachBattleChipGate();
+	void setBattleChipId(uint16_t id);
+#endif
 
 	void setAVStream(mAVStream*);
 	void clearAVStream();
@@ -221,6 +233,10 @@ struct QGBPrinter {
 		GBPrinter d;
 		CoreController* parent;
 	} m_printer;
+#endif
+
+#ifdef M_CORE_GBA
+	GBASIOBattlechipGate m_battlechip;
 #endif
 };
 

@@ -21,6 +21,7 @@ #endif
 
 #include "AboutScreen.h"
 #include "AudioProcessor.h"
+#include "BattleChipView.h"
 #include "CheatsView.h"
 #include "ConfigController.h"
 #include "CoreController.h"
@@ -1350,6 +1351,31 @@ });
 		addControlledAction(solarMenu, setSolar, QString("luminanceLevel.%1").arg(QString::number(i)));
 	}
 
+#ifdef M_CORE_GB
+	QAction* gbPrint = new QAction(tr("Game Boy Printer..."), emulationMenu);
+	connect(gbPrint, &QAction::triggered, [this]() {
+		PrinterView* view = new PrinterView(m_controller);
+		openView(view);
+		m_controller->attachPrinter();
+
+	});
+	addControlledAction(emulationMenu, gbPrint, "gbPrint");
+	m_gameActions.append(gbPrint);
+#endif
+
+#ifdef M_CORE_GBA
+	QAction* bcGate = new QAction(tr("BattleChip Gate..."), emulationMenu);
+	connect(bcGate, &QAction::triggered, [this]() {
+		BattleChipView* view = new BattleChipView(m_controller);
+		openView(view);
+		m_controller->attachBattleChipGate();
+
+	});
+	addControlledAction(emulationMenu, bcGate, "bcGate");
+	m_gbaActions.append(bcGate);
+	m_gameActions.append(bcGate);
+#endif
+
 	QMenu* avMenu = menubar->addMenu(tr("Audio/&Video"));
 	m_shortcutController->addMenu(avMenu);
 	QMenu* frameMenu = avMenu->addMenu(tr("Frame size"));
@@ -1494,18 +1520,6 @@ m_controller->endVideoLog();
 	});
 	addControlledAction(avMenu, stopVL, "stopVL");
 	m_gameActions.append(stopVL);
-
-#ifdef M_CORE_GB
-	QAction* gbPrint = new QAction(tr("Game Boy Printer..."), avMenu);
-	connect(gbPrint, &QAction::triggered, [this]() {
-		PrinterView* view = new PrinterView(m_controller);
-		openView(view);
-		m_controller->attachPrinter();
-
-	});
-	addControlledAction(avMenu, gbPrint, "gbPrint");
-	m_gameActions.append(gbPrint);
-#endif
 
 	avMenu->addSeparator();
 	m_videoLayers = avMenu->addMenu(tr("Video layers"));