diff --git a/CHANGES b/CHANGES
index 8774ec4ce..6bf013c96 100644
--- a/CHANGES
+++ b/CHANGES
@@ -44,6 +44,8 @@ Misc:
  - Qt: Add hex index to palette view
  - Qt: Add transformation matrix info to sprite view
  - Qt: Disable Replace ROM option when no game loaded
+ - Qt: Defer texture updates until frame is drawn (fixes mgba.io/i/1590)
+ - Qt: Set icon for Discord Rich Presence
 
 0.8.1: (2020-02-16)
 Emulation fixes:
diff --git a/include/mgba/gba/interface.h b/include/mgba/gba/interface.h
index 8c725e161..0c13834dd 100644
--- a/include/mgba/gba/interface.h
+++ b/include/mgba/gba/interface.h
@@ -88,6 +88,8 @@ struct GBASIOBattlechipGate {
 
 void GBASIOBattlechipGateCreate(struct GBASIOBattlechipGate*);
 
+void GBAEReaderQueueCard(struct GBA* gba, const void* data, size_t size);
+
 CXX_GUARD_END
 
 #endif
diff --git a/include/mgba/internal/gba/hardware.h b/include/mgba/internal/gba/hardware.h
index 1a78c914e..a06da3a80 100644
--- a/include/mgba/internal/gba/hardware.h
+++ b/include/mgba/internal/gba/hardware.h
@@ -16,6 +16,10 @@ CXX_GUARD_START
 
 mLOG_DECLARE_CATEGORY(GBA_HW);
 
+#define EREADER_DOTCODE_STRIDE 1420
+#define EREADER_DOTCODE_SIZE (EREADER_DOTCODE_STRIDE * 40)
+#define EREADER_CARDS_MAX 16
+
 #define IS_GPIO_REGISTER(reg) ((reg) == GPIO_REG_DATA || (reg) == GPIO_REG_DIRECTION || (reg) == GPIO_REG_CONTROL)
 
 struct GBARTCGenericSource {
@@ -142,6 +146,11 @@ enum EReaderCommand {
 	EREADER_COMMAND_READ_DATA = 0x23,
 };
 
+struct EReaderCard {
+	void* data;
+	size_t size;
+};
+
 struct GBACartridgeHardware {
 	struct GBA* p;
 	uint32_t devices;
@@ -186,6 +195,7 @@ struct GBACartridgeHardware {
 	int eReaderX;
 	int eReaderY;
 	uint8_t* eReaderDots;
+	struct EReaderCard eReaderCards[EREADER_CARDS_MAX];
 };
 
 void GBAHardwareInit(struct GBACartridgeHardware* gpio, uint16_t* gpioBase);
diff --git a/src/gba/CMakeLists.txt b/src/gba/CMakeLists.txt
index 94bb8f09f..5b4a52c0c 100644
--- a/src/gba/CMakeLists.txt
+++ b/src/gba/CMakeLists.txt
@@ -9,6 +9,7 @@ set(SOURCE_FILES
 	cheats/parv3.c
 	core.c
 	dma.c
+	ereader.c
 	gba.c
 	hardware.c
 	hle-bios.c
diff --git a/src/gba/ereader.c b/src/gba/ereader.c
new file mode 100644
index 000000000..f624c3221
--- /dev/null
+++ b/src/gba/ereader.c
@@ -0,0 +1,649 @@
+
+/* Copyright (c) 2013-2020 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 <mgba/internal/gba/hardware.h>
+
+#include <mgba/internal/arm/macros.h>
+#include <mgba/internal/gba/gba.h>
+#include <mgba-util/memory.h>
+
+#define EREADER_BLOCK_SIZE 40
+
+static void _eReaderReset(struct GBACartridgeHardware* hw);
+static void _eReaderWriteControl0(struct GBACartridgeHardware* hw, uint8_t value);
+static void _eReaderWriteControl1(struct GBACartridgeHardware* hw, uint8_t value);
+static void _eReaderReadData(struct GBACartridgeHardware* hw);
+static void _eReaderReedSolomon(const uint8_t* input, uint8_t* output);
+
+const int EREADER_NYBBLE_5BIT[16][5] = {
+	{ 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 1 },
+	{ 0, 0, 0, 1, 0 },
+	{ 1, 0, 0, 1, 0 },
+	{ 0, 0, 1, 0, 0 },
+	{ 0, 0, 1, 0, 1 },
+	{ 0, 0, 1, 1, 0 },
+	{ 1, 0, 1, 1, 0 },
+	{ 0, 1, 0, 0, 0 },
+	{ 0, 1, 0, 0, 1 },
+	{ 0, 1, 0, 1, 0 },
+	{ 1, 0, 1, 0, 0 },
+	{ 0, 1, 1, 0, 0 },
+	{ 0, 1, 1, 0, 1 },
+	{ 1, 0, 0, 0, 1 },
+	{ 1, 0, 0, 0, 0 }
+};
+
+const uint8_t EREADER_CALIBRATION_TEMPLATE[] = {
+	0x43, 0x61, 0x72, 0x64, 0x2d, 0x45, 0x20, 0x52, 0x65, 0x61, 0x64, 0x65, 0x72, 0x20, 0x32, 0x30,
+	0x30, 0x31, 0x00, 0x00, 0xcf, 0x72, 0x2f, 0x37, 0x3a, 0x3a, 0x3a, 0x38, 0x33, 0x30, 0x30, 0x37,
+	0x3a, 0x39, 0x37, 0x35, 0x33, 0x2f, 0x2f, 0x34, 0x36, 0x36, 0x37, 0x36, 0x34, 0x31, 0x2d, 0x30,
+	0x32, 0x34, 0x35, 0x35, 0x34, 0x30, 0x2a, 0x2d, 0x2d, 0x2f, 0x31, 0x32, 0x31, 0x2f, 0x29, 0x2a,
+	0x2c, 0x2b, 0x2c, 0x2e, 0x2e, 0x2d, 0x18, 0x2d, 0x8f, 0x03, 0x00, 0x00, 0xc0, 0xfd, 0x77, 0x00,
+	0x00, 0x00, 0x01
+};
+
+const uint16_t EREADER_ADDRESS_CODES[] = {
+	1023,
+	1174,
+	2628,
+	3373,
+	4233,
+	6112,
+	6450,
+	7771,
+	8826,
+	9491,
+	11201,
+	11432,
+	12556,
+	13925,
+	14519,
+	16350,
+	16629,
+	18332,
+	18766,
+	20007,
+	21379,
+	21738,
+	23096,
+	23889,
+	24944,
+	26137,
+	26827,
+	28578,
+	29190,
+	30063,
+	31677,
+	31956,
+	33410,
+	34283,
+	35641,
+	35920,
+	37364,
+	38557,
+	38991,
+	40742,
+	41735,
+	42094,
+	43708,
+	44501,
+	45169,
+	46872,
+	47562,
+	48803,
+	49544,
+	50913,
+	51251,
+	53082,
+	54014,
+	54679
+};
+
+static const uint8_t BLOCK_HEADER[2][0x18] = {
+	{ 0x00, 0x02, 0x00, 0x01, 0x40, 0x10, 0x00, 0x1c, 0x10, 0x6f, 0x40, 0xda, 0x39, 0x25, 0x8e, 0xe0, 0x7b, 0xb5, 0x98, 0xb6, 0x5b, 0xcf, 0x7f, 0x72 },
+	{ 0x00, 0x03, 0x00, 0x19, 0x40, 0x10, 0x00, 0x2c, 0x0e, 0x88, 0xed, 0x82, 0x50, 0x67, 0xfb, 0xd1, 0x43, 0xee, 0x03, 0xc6, 0xc6, 0x2b, 0x2c, 0x93 }
+};
+
+static const uint8_t RS_POW[] = {
+	0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x87, 0x89, 0x95, 0xad, 0xdd, 0x3d, 0x7a, 0xf4,
+	0x6f, 0xde, 0x3b, 0x76, 0xec, 0x5f, 0xbe, 0xfb, 0x71, 0xe2, 0x43, 0x86, 0x8b, 0x91, 0xa5, 0xcd,
+	0x1d, 0x3a, 0x74, 0xe8, 0x57, 0xae, 0xdb, 0x31, 0x62, 0xc4, 0x0f, 0x1e, 0x3c, 0x78, 0xf0, 0x67,
+	0xce, 0x1b, 0x36, 0x6c, 0xd8, 0x37, 0x6e, 0xdc, 0x3f, 0x7e, 0xfc, 0x7f, 0xfe, 0x7b, 0xf6, 0x6b,
+	0xd6, 0x2b, 0x56, 0xac, 0xdf, 0x39, 0x72, 0xe4, 0x4f, 0x9e, 0xbb, 0xf1, 0x65, 0xca, 0x13, 0x26,
+	0x4c, 0x98, 0xb7, 0xe9, 0x55, 0xaa, 0xd3, 0x21, 0x42, 0x84, 0x8f, 0x99, 0xb5, 0xed, 0x5d, 0xba,
+	0xf3, 0x61, 0xc2, 0x03, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x07, 0x0e, 0x1c, 0x38, 0x70, 0xe0,
+	0x47, 0x8e, 0x9b, 0xb1, 0xe5, 0x4d, 0x9a, 0xb3, 0xe1, 0x45, 0x8a, 0x93, 0xa1, 0xc5, 0x0d, 0x1a,
+	0x34, 0x68, 0xd0, 0x27, 0x4e, 0x9c, 0xbf, 0xf9, 0x75, 0xea, 0x53, 0xa6, 0xcb, 0x11, 0x22, 0x44,
+	0x88, 0x97, 0xa9, 0xd5, 0x2d, 0x5a, 0xb4, 0xef, 0x59, 0xb2, 0xe3, 0x41, 0x82, 0x83, 0x81, 0x85,
+	0x8d, 0x9d, 0xbd, 0xfd, 0x7d, 0xfa, 0x73, 0xe6, 0x4b, 0x96, 0xab, 0xd1, 0x25, 0x4a, 0x94, 0xaf,
+	0xd9, 0x35, 0x6a, 0xd4, 0x2f, 0x5e, 0xbc, 0xff, 0x79, 0xf2, 0x63, 0xc6, 0x0b, 0x16, 0x2c, 0x58,
+	0xb0, 0xe7, 0x49, 0x92, 0xa3, 0xc1, 0x05, 0x0a, 0x14, 0x28, 0x50, 0xa0, 0xc7, 0x09, 0x12, 0x24,
+	0x48, 0x90, 0xa7, 0xc9, 0x15, 0x2a, 0x54, 0xa8, 0xd7, 0x29, 0x52, 0xa4, 0xcf, 0x19, 0x32, 0x64,
+	0xc8, 0x17, 0x2e, 0x5c, 0xb8, 0xf7, 0x69, 0xd2, 0x23, 0x46, 0x8c, 0x9f, 0xb9, 0xf5, 0x6d, 0xda,
+	0x33, 0x66, 0xcc, 0x1f, 0x3e, 0x7c, 0xf8, 0x77, 0xee, 0x5b, 0xb6, 0xeb, 0x51, 0xa2, 0xc3, 0x00,
+};
+
+static const uint8_t RS_REV[] = {
+	0xff, 0x00, 0x01, 0x63, 0x02, 0xc6, 0x64, 0x6a, 0x03, 0xcd, 0xc7, 0xbc, 0x65, 0x7e, 0x6b, 0x2a,
+	0x04, 0x8d, 0xce, 0x4e, 0xc8, 0xd4, 0xbd, 0xe1, 0x66, 0xdd, 0x7f, 0x31, 0x6c, 0x20, 0x2b, 0xf3,
+	0x05, 0x57, 0x8e, 0xe8, 0xcf, 0xac, 0x4f, 0x83, 0xc9, 0xd9, 0xd5, 0x41, 0xbe, 0x94, 0xe2, 0xb4,
+	0x67, 0x27, 0xde, 0xf0, 0x80, 0xb1, 0x32, 0x35, 0x6d, 0x45, 0x21, 0x12, 0x2c, 0x0d, 0xf4, 0x38,
+	0x06, 0x9b, 0x58, 0x1a, 0x8f, 0x79, 0xe9, 0x70, 0xd0, 0xc2, 0xad, 0xa8, 0x50, 0x75, 0x84, 0x48,
+	0xca, 0xfc, 0xda, 0x8a, 0xd6, 0x54, 0x42, 0x24, 0xbf, 0x98, 0x95, 0xf9, 0xe3, 0x5e, 0xb5, 0x15,
+	0x68, 0x61, 0x28, 0xba, 0xdf, 0x4c, 0xf1, 0x2f, 0x81, 0xe6, 0xb2, 0x3f, 0x33, 0xee, 0x36, 0x10,
+	0x6e, 0x18, 0x46, 0xa6, 0x22, 0x88, 0x13, 0xf7, 0x2d, 0xb8, 0x0e, 0x3d, 0xf5, 0xa4, 0x39, 0x3b,
+	0x07, 0x9e, 0x9c, 0x9d, 0x59, 0x9f, 0x1b, 0x08, 0x90, 0x09, 0x7a, 0x1c, 0xea, 0xa0, 0x71, 0x5a,
+	0xd1, 0x1d, 0xc3, 0x7b, 0xae, 0x0a, 0xa9, 0x91, 0x51, 0x5b, 0x76, 0x72, 0x85, 0xa1, 0x49, 0xeb,
+	0xcb, 0x7c, 0xfd, 0xc4, 0xdb, 0x1e, 0x8b, 0xd2, 0xd7, 0x92, 0x55, 0xaa, 0x43, 0x0b, 0x25, 0xaf,
+	0xc0, 0x73, 0x99, 0x77, 0x96, 0x5c, 0xfa, 0x52, 0xe4, 0xec, 0x5f, 0x4a, 0xb6, 0xa2, 0x16, 0x86,
+	0x69, 0xc5, 0x62, 0xfe, 0x29, 0x7d, 0xbb, 0xcc, 0xe0, 0xd3, 0x4d, 0x8c, 0xf2, 0x1f, 0x30, 0xdc,
+	0x82, 0xab, 0xe7, 0x56, 0xb3, 0x93, 0x40, 0xd8, 0x34, 0xb0, 0xef, 0x26, 0x37, 0x0c, 0x11, 0x44,
+	0x6f, 0x78, 0x19, 0x9a, 0x47, 0x74, 0xa7, 0xc1, 0x23, 0x53, 0x89, 0xfb, 0x14, 0x5d, 0xf8, 0x97,
+	0x2e, 0x4b, 0xb9, 0x60, 0x0f, 0xed, 0x3e, 0xe5, 0xf6, 0x87, 0xa5, 0x17, 0x3a, 0xa3, 0x3c, 0xb7,
+};
+
+static const uint8_t RS_GG[] = {
+	0x00, 0x4b, 0xeb, 0xd5, 0xef, 0x4c, 0x71, 0x00, 0xf4, 0x00, 0x71, 0x4c, 0xef, 0xd5, 0xeb, 0x4b
+};
+
+
+void GBAHardwareInitEReader(struct GBACartridgeHardware* hw) {
+	hw->devices |= HW_EREADER;
+	_eReaderReset(hw);
+
+	if (hw->p->memory.savedata.data[0xD000] == 0xFF) {
+		memset(&hw->p->memory.savedata.data[0xD000], 0, 0x1000);
+		memcpy(&hw->p->memory.savedata.data[0xD000], EREADER_CALIBRATION_TEMPLATE, sizeof(EREADER_CALIBRATION_TEMPLATE));
+	}
+	if (hw->p->memory.savedata.data[0xE000] == 0xFF) {
+		memset(&hw->p->memory.savedata.data[0xE000], 0, 0x1000);
+		memcpy(&hw->p->memory.savedata.data[0xE000], EREADER_CALIBRATION_TEMPLATE, sizeof(EREADER_CALIBRATION_TEMPLATE));
+	}
+}
+
+void GBAHardwareEReaderWrite(struct GBACartridgeHardware* hw, uint32_t address, uint16_t value) {
+	address &= 0x700FF;
+	switch (address >> 17) {
+	case 0:
+		hw->eReaderRegisterUnk = value & 0xF;
+		break;
+	case 1:
+		hw->eReaderRegisterReset = (value & 0x8A) | 4;
+		if (value & 2) {
+			_eReaderReset(hw);
+		}
+		break;
+	case 2:
+		mLOG(GBA_HW, GAME_ERROR, "e-Reader write to read-only registers: %05X:%04X", address, value);
+		break;
+	default:
+		mLOG(GBA_HW, STUB, "Unimplemented e-Reader write: %05X:%04X", address, value);
+	}
+}
+
+void GBAHardwareEReaderWriteFlash(struct GBACartridgeHardware* hw, uint32_t address, uint8_t value) {
+	address &= 0xFFFF;
+	switch (address) {
+	case 0xFFB0:
+		_eReaderWriteControl0(hw, value);
+		break;
+	case 0xFFB1:
+		_eReaderWriteControl1(hw, value);
+		break;
+	case 0xFFB2:
+		hw->eReaderRegisterLed &= 0xFF00;
+		hw->eReaderRegisterLed |= value;
+		break;
+	case 0xFFB3:
+		hw->eReaderRegisterLed &= 0x00FF;
+		hw->eReaderRegisterLed |= value << 8;
+		break;
+	default:
+		mLOG(GBA_HW, STUB, "Unimplemented e-Reader write to flash: %04X:%02X", address, value);
+	}
+}
+
+uint16_t GBAHardwareEReaderRead(struct GBACartridgeHardware* hw, uint32_t address) {
+	address &= 0x700FF;
+	uint16_t value;
+	switch (address >> 17) {
+	case 0:
+		return hw->eReaderRegisterUnk;
+	case 1:
+		return hw->eReaderRegisterReset;
+	case 2:
+		if (address > 0x40088) {
+			return 0;
+		}
+		LOAD_16(value, address & 0xFE, hw->eReaderData);
+		return value;
+	}
+	mLOG(GBA_HW, STUB, "Unimplemented e-Reader read: %05X", address);
+	return 0;
+}
+
+uint8_t GBAHardwareEReaderReadFlash(struct GBACartridgeHardware* hw, uint32_t address) {
+	address &= 0xFFFF;
+	switch (address) {
+	case 0xFFB0:
+		return hw->eReaderRegisterControl0;
+	case 0xFFB1:
+		return hw->eReaderRegisterControl1;
+	default:
+		mLOG(GBA_HW, STUB, "Unimplemented e-Reader read from flash: %04X", address);
+		return 0;
+	}
+}
+
+static void _eReaderAnchor(uint8_t* origin) {
+	origin[EREADER_DOTCODE_STRIDE * 0 + 1] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 0 + 2] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 0 + 3] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 1 + 0] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 1 + 1] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 1 + 2] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 1 + 3] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 1 + 4] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 2 + 0] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 2 + 1] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 2 + 2] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 2 + 3] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 2 + 4] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 3 + 0] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 3 + 1] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 3 + 2] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 3 + 3] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 3 + 4] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 4 + 1] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 4 + 2] = 1;
+	origin[EREADER_DOTCODE_STRIDE * 4 + 3] = 1;
+}
+
+static void _eReaderAlignment(uint8_t* origin) {
+	origin[8] = 1;
+	origin[10] = 1;
+	origin[12] = 1;
+	origin[14] = 1;
+	origin[16] = 1;
+	origin[18] = 1;
+	origin[21] = 1;
+	origin[23] = 1;
+	origin[25] = 1;
+	origin[27] = 1;
+	origin[29] = 1;
+	origin[31] = 1;
+}
+
+static void _eReaderAddress(uint8_t* origin, int a) {
+	origin[EREADER_DOTCODE_STRIDE * 7 + 2] = 1;
+	uint16_t addr = EREADER_ADDRESS_CODES[a];
+	int i;
+	for (i = 0; i < 16; ++i) {
+		origin[EREADER_DOTCODE_STRIDE * (16 + i) + 2] = (addr >> (15 - i)) & 1;
+	}
+}
+
+static void _eReaderReedSolomon(const uint8_t* input, uint8_t* output) {
+	uint8_t rsBuffer[64] = {};
+	int i;
+	for (i = 0; i < 48; ++i) {
+		rsBuffer[63 - i] = input[i];
+	}
+	for (i = 0; i < 48; ++i) {
+		unsigned z = RS_REV[rsBuffer[63 - i] ^ rsBuffer[15]];
+		int j;
+		for (j = 15; j >= 0; --j) {
+			unsigned x = 0;
+			if (j != 0) {
+				x = rsBuffer[j - 1];
+			}
+			if (z != 0xFF) {
+				unsigned y = RS_GG[j];
+				if (y != 0xFF) {
+					y += z;
+					if (y >= 0xFF) {
+						y -= 0xFF;
+					}
+					x ^= RS_POW[y];
+				}
+			}
+			rsBuffer[j] = x;
+		}
+	}
+	for (i = 0; i < 16; ++i) {
+		output[15 - i] = ~rsBuffer[i];
+	}
+}
+
+void GBAHardwareEReaderScan(struct GBACartridgeHardware* hw, const void* data, size_t size) {
+	if (!hw->eReaderDots) {
+		hw->eReaderDots = anonymousMemoryMap(EREADER_DOTCODE_SIZE);
+	}
+	hw->eReaderX = -24;
+	memset(hw->eReaderDots, 0, EREADER_DOTCODE_SIZE);
+
+	uint8_t blockRS[44][0x10];
+	bool parsed = false;
+	bool bitmap = false;
+	size_t blocks;
+	int base;
+	switch (size) {
+	// Raw sizes
+	case 2112:
+		parsed = true;
+		// Fallthrough
+	case 2912:
+		base = 25;
+		blocks = 28;
+		break;
+	case 1344:
+		parsed = true;
+		// Fallthrough
+	case 1872:
+		base = 1;
+		blocks = 18;
+		break;
+	// Bitmap sizes
+	case 5456:
+		bitmap = true;
+		break;
+	default:
+		return;
+	}
+
+	size_t i;
+	if (bitmap) {
+		size_t x;
+		for (i = 0; i < 40; ++i) {
+			const uint8_t* line = &((const uint8_t*) data)[(i + 2) * 124];
+			uint8_t* origin = &hw->eReaderDots[EREADER_DOTCODE_STRIDE * i + 200];
+			for (x = 0; x < 124; ++x) {
+				uint8_t byte = line[x];
+				if (x == 123) {
+					byte &= 0xE0;
+				}
+				origin[x * 8 + 0] = (byte >> 7) & 1;
+				origin[x * 8 + 1] = (byte >> 6) & 1;
+				origin[x * 8 + 2] = (byte >> 5) & 1;
+				origin[x * 8 + 3] = (byte >> 4) & 1;
+				origin[x * 8 + 4] = (byte >> 3) & 1;
+				origin[x * 8 + 5] = (byte >> 2) & 1;
+				origin[x * 8 + 6] = (byte >> 1) & 1;
+				origin[x * 8 + 7] = byte & 1;
+			}
+		}		
+		return;
+	}
+
+	for (i = 0; i < blocks + 1; ++i) {
+		uint8_t* origin = &hw->eReaderDots[35 * i + 200];
+		_eReaderAnchor(&origin[EREADER_DOTCODE_STRIDE * 0]);
+		_eReaderAnchor(&origin[EREADER_DOTCODE_STRIDE * 35]);
+		_eReaderAddress(origin, base + i);
+	}
+	if (parsed) {
+		for (i = 0; i < size / 48; ++i) {
+			_eReaderReedSolomon(&((const uint8_t*) data)[i * 48], blockRS[i]);
+		}
+	}
+	size_t blockId = 0;
+	size_t byteOffset = 0;
+	for (i = 0; i < blocks; ++i) {
+		uint8_t block[1040];
+		uint8_t* origin = &hw->eReaderDots[35 * i + 200];
+		_eReaderAlignment(&origin[EREADER_DOTCODE_STRIDE * 2]);
+		_eReaderAlignment(&origin[EREADER_DOTCODE_STRIDE * 37]);
+
+		const uint8_t* blockData;
+		uint8_t parsedBlockData[104];
+		if (parsed) {
+			memset(parsedBlockData, 0, sizeof(*parsedBlockData));
+			const uint8_t* header = BLOCK_HEADER[size == 1344 ? 0 : 1];
+			parsedBlockData[0] = header[(2 * i) % 0x18];
+			parsedBlockData[1] = header[(2 * i) % 0x18 + 1];
+			int j;
+			for (j = 2; j < 104; ++j) {
+			    if (byteOffset >= 0x40) {
+			        break;
+			    }
+			    if (byteOffset >= 0x30) {
+			        parsedBlockData[j] = blockRS[blockId][byteOffset - 0x30];
+			    } else {
+			        parsedBlockData[j] = ((const uint8_t*) data)[blockId * 0x30 + byteOffset];
+			    }
+			    ++blockId;
+			    if (blockId * 0x30 >= size) {
+			        blockId = 0;
+			        ++byteOffset;
+			    }
+			}
+			blockData = parsedBlockData;
+		} else {
+			blockData = &((const uint8_t*) data)[i * 104];
+		}
+		int b;
+		for (b = 0; b < 104; ++b) {
+			const int* nybble5;
+			nybble5 = EREADER_NYBBLE_5BIT[blockData[b] >> 4];
+			block[b * 10 + 0] = nybble5[0];
+			block[b * 10 + 1] = nybble5[1];
+			block[b * 10 + 2] = nybble5[2];
+			block[b * 10 + 3] = nybble5[3];
+			block[b * 10 + 4] = nybble5[4];
+			nybble5 = EREADER_NYBBLE_5BIT[blockData[b] & 0xF];
+			block[b * 10 + 5] = nybble5[0];
+			block[b * 10 + 6] = nybble5[1];
+			block[b * 10 + 7] = nybble5[2];
+			block[b * 10 + 8] = nybble5[3];
+			block[b * 10 + 9] = nybble5[4];
+		}
+
+		b = 0;
+		int y;
+		for (y = 0; y < 3; ++y) {
+			memcpy(&origin[EREADER_DOTCODE_STRIDE * (4 + y) + 7], &block[b], 26);
+			b += 26;
+		}
+		for (y = 0; y < 26; ++y) {
+			memcpy(&origin[EREADER_DOTCODE_STRIDE * (7 + y) + 3], &block[b], 34);
+			b += 34;
+		}
+		for (y = 0; y < 3; ++y) {
+			memcpy(&origin[EREADER_DOTCODE_STRIDE * (33 + y) + 7], &block[b], 26);
+			b += 26;
+		}
+	}
+}
+
+void _eReaderReset(struct GBACartridgeHardware* hw) {
+	memset(hw->eReaderData, 0, sizeof(hw->eReaderData));
+	hw->eReaderRegisterUnk = 0;
+	hw->eReaderRegisterReset = 4;
+	hw->eReaderRegisterControl0 = 0;
+	hw->eReaderRegisterControl1 = 0x80;
+	hw->eReaderRegisterLed = 0;
+	hw->eReaderState = 0;
+	hw->eReaderActiveRegister = 0;
+}
+
+void _eReaderWriteControl0(struct GBACartridgeHardware* hw, uint8_t value) {
+	EReaderControl0 control = value & 0x7F;
+	EReaderControl0 oldControl = hw->eReaderRegisterControl0;
+	if (hw->eReaderState == EREADER_SERIAL_INACTIVE) {
+		if (EReaderControl0IsClock(oldControl) && EReaderControl0IsData(oldControl) && !EReaderControl0IsData(control)) {
+			hw->eReaderState = EREADER_SERIAL_STARTING;
+		}
+	} else if (EReaderControl0IsClock(oldControl) && !EReaderControl0IsData(oldControl) && EReaderControl0IsData(control)) {
+		hw->eReaderState = EREADER_SERIAL_INACTIVE;
+
+	} else if (hw->eReaderState == EREADER_SERIAL_STARTING) {
+		if (EReaderControl0IsClock(oldControl) && !EReaderControl0IsData(oldControl) && !EReaderControl0IsClock(control)) {
+			hw->eReaderState = EREADER_SERIAL_BIT_0;
+			hw->eReaderCommand = EREADER_COMMAND_IDLE;
+		}
+	} else if (EReaderControl0IsClock(oldControl) && !EReaderControl0IsClock(control)) {
+		mLOG(GBA_HW, DEBUG, "[e-Reader] Serial falling edge: %c %i", EReaderControl0IsDirection(control) ? '>' : '<', EReaderControl0GetData(control));
+		// TODO: Improve direction control
+		if (EReaderControl0IsDirection(control)) {
+			hw->eReaderByte |= EReaderControl0GetData(control) << (7 - (hw->eReaderState - EREADER_SERIAL_BIT_0));
+			++hw->eReaderState;
+			if (hw->eReaderState == EREADER_SERIAL_END_BIT) {
+				mLOG(GBA_HW, DEBUG, "[e-Reader] Wrote serial byte: %02x", hw->eReaderByte);
+				switch (hw->eReaderCommand) {
+				case EREADER_COMMAND_IDLE:
+					hw->eReaderCommand = hw->eReaderByte;
+					break;
+				case EREADER_COMMAND_SET_INDEX:
+					hw->eReaderActiveRegister = hw->eReaderByte;
+					hw->eReaderCommand = EREADER_COMMAND_WRITE_DATA;
+					break;
+				case EREADER_COMMAND_WRITE_DATA:
+					switch (hw->eReaderActiveRegister & 0x7F) {
+					case 0:
+					case 0x57:
+					case 0x58:
+					case 0x59:
+					case 0x5A:
+						// Read-only
+						mLOG(GBA_HW, GAME_ERROR, "Writing to read-only e-Reader serial register: %02X", hw->eReaderActiveRegister);
+						break;
+					default:
+						if ((hw->eReaderActiveRegister & 0x7F) > 0x5A) {
+							mLOG(GBA_HW, GAME_ERROR, "Writing to non-existent e-Reader serial register: %02X", hw->eReaderActiveRegister);
+							break;
+						}
+						hw->eReaderSerial[hw->eReaderActiveRegister & 0x7F] = hw->eReaderByte;
+						break;
+					}
+					++hw->eReaderActiveRegister;
+					break;
+				default:
+					mLOG(GBA_HW, ERROR, "Hit undefined state %02X in e-Reader state machine", hw->eReaderCommand);
+					break;
+				}
+				hw->eReaderState = EREADER_SERIAL_BIT_0;
+				hw->eReaderByte = 0;
+			}
+		} else if (hw->eReaderCommand == EREADER_COMMAND_READ_DATA) {
+			int bit = hw->eReaderSerial[hw->eReaderActiveRegister & 0x7F] >> (7 - (hw->eReaderState - EREADER_SERIAL_BIT_0));
+			control = EReaderControl0SetData(control, bit);
+			++hw->eReaderState;
+			if (hw->eReaderState == EREADER_SERIAL_END_BIT) {
+				++hw->eReaderActiveRegister;
+				mLOG(GBA_HW, DEBUG, "[e-Reader] Read serial byte: %02x", hw->eReaderSerial[hw->eReaderActiveRegister & 0x7F]);
+			}
+		}
+	} else if (!EReaderControl0IsDirection(control)) {
+		// Clear the error bit
+		control = EReaderControl0ClearData(control);
+	}
+	hw->eReaderRegisterControl0 = control;
+	if (!EReaderControl0IsScan(oldControl) && EReaderControl0IsScan(control)) {
+		if (hw->eReaderX > 1000) {
+			int i;
+			for (i = 0; i < EREADER_CARDS_MAX; ++i) {
+				if (!hw->eReaderCards[i].data) {
+					continue;
+				}
+				GBAHardwareEReaderScan(hw, hw->eReaderCards[i].data, hw->eReaderCards[i].size);
+				free(hw->eReaderCards[i].data);
+				hw->eReaderCards[i].data = NULL;
+				hw->eReaderCards[i].size = 0;
+				break;
+			}
+		}
+		hw->eReaderX = 0;
+		hw->eReaderY = 0;
+	} else if (EReaderControl0IsLedEnable(control) && EReaderControl0IsScan(control) && !EReaderControl1IsScanline(hw->eReaderRegisterControl1)) {
+		_eReaderReadData(hw);
+	}
+	mLOG(GBA_HW, STUB, "Unimplemented e-Reader Control0 write: %02X", value);
+}
+
+void _eReaderWriteControl1(struct GBACartridgeHardware* hw, uint8_t value) {
+	EReaderControl1 control = (value & 0x32) | 0x80;
+	hw->eReaderRegisterControl1 = control;
+	if (EReaderControl0IsScan(hw->eReaderRegisterControl0) && !EReaderControl1IsScanline(control)) {
+		++hw->eReaderY;
+		if (hw->eReaderY == (hw->eReaderSerial[0x15] | (hw->eReaderSerial[0x14] << 8))) {
+			hw->eReaderY = 0;
+			if (hw->eReaderX < 3400) {
+				hw->eReaderX += 210;
+			}
+		}
+		_eReaderReadData(hw);
+	}
+	mLOG(GBA_HW, STUB, "Unimplemented e-Reader Control1 write: %02X", value);
+}
+
+void _eReaderReadData(struct GBACartridgeHardware* hw) {
+	memset(hw->eReaderData, 0, EREADER_BLOCK_SIZE);
+	if (!hw->eReaderDots) {
+		int i;
+		for (i = 0; i < EREADER_CARDS_MAX; ++i) {
+			if (!hw->eReaderCards[i].data) {
+				continue;
+			}
+			GBAHardwareEReaderScan(hw, hw->eReaderCards[i].data, hw->eReaderCards[i].size);
+			free(hw->eReaderCards[i].data);
+			hw->eReaderCards[i].data = NULL;
+			hw->eReaderCards[i].size = 0;
+			break;
+		}
+	}
+	if (hw->eReaderDots) {
+		int y = hw->eReaderY - 10;
+		if (y < 0 || y >= 120) {
+			memset(hw->eReaderData, 0, EREADER_BLOCK_SIZE);
+		} else {
+			int i;
+			uint8_t* origin = &hw->eReaderDots[EREADER_DOTCODE_STRIDE * (y / 3) + 16];
+			for (i = 0; i < 20; ++i) {
+				uint16_t word = 0;
+				int x = hw->eReaderX + i * 16;
+				word |= origin[(x +  0) / 3] << 8;
+				word |= origin[(x +  1) / 3] << 9;
+				word |= origin[(x +  2) / 3] << 10;
+				word |= origin[(x +  3) / 3] << 11;
+				word |= origin[(x +  4) / 3] << 12;
+				word |= origin[(x +  5) / 3] << 13;
+				word |= origin[(x +  6) / 3] << 14;
+				word |= origin[(x +  7) / 3] << 15;
+				word |= origin[(x +  8) / 3];
+				word |= origin[(x +  9) / 3] << 1;
+				word |= origin[(x + 10) / 3] << 2;
+				word |= origin[(x + 11) / 3] << 3;
+				word |= origin[(x + 12) / 3] << 4;
+				word |= origin[(x + 13) / 3] << 5;
+				word |= origin[(x + 14) / 3] << 6;
+				word |= origin[(x + 15) / 3] << 7;
+				STORE_16(word, (19 - i) << 1, hw->eReaderData);
+			}
+		}
+	}
+	hw->eReaderRegisterControl1 = EReaderControl1FillScanline(hw->eReaderRegisterControl1);
+	if (EReaderControl0IsLedEnable(hw->eReaderRegisterControl0)) {
+		uint16_t led = hw->eReaderRegisterLed * 2;
+		if (led > 0x4000) {
+			led = 0x4000;
+		}
+		GBARaiseIRQ(hw->p, IRQ_GAMEPAK, -led);
+	}
+}
+
+void GBAEReaderQueueCard(struct GBA* gba, const void* data, size_t size) {	
+	int i;
+	for (i = 0; i < EREADER_CARDS_MAX; ++i) {
+		if (gba->memory.hw.eReaderCards[i].data) {
+			continue;
+		}
+		gba->memory.hw.eReaderCards[i].data = malloc(size);
+		memcpy(gba->memory.hw.eReaderCards[i].data, data, size);
+		gba->memory.hw.eReaderCards[i].size = size;
+		return;
+	}
+}
\ No newline at end of file
diff --git a/src/gba/hardware.c b/src/gba/hardware.c
index d80cdba21..42af4aa18 100644
--- a/src/gba/hardware.c
+++ b/src/gba/hardware.c
@@ -12,97 +12,9 @@
 #include <mgba-util/hash.h>
 #include <mgba-util/memory.h>
 
-#define EREADER_BLOCK_SIZE 40
-#define EREADER_DOTCODE_STRIDE 1200
-#define EREADER_DOTCODE_SIZE (EREADER_DOTCODE_STRIDE * 40 + 200)
-
 mLOG_DEFINE_CATEGORY(GBA_HW, "GBA Pak Hardware", "gba.hardware");
 
 MGBA_EXPORT const int GBA_LUX_LEVELS[10] = { 5, 11, 18, 27, 42, 62, 84, 109, 139, 183 };
-const uint16_t EREADER_ADDRESS_CODES[] = {
-	1023,
-	1174,
-	2628,
-	3373,
-	4233,
-	6112,
-	6450,
-	7771,
-	8826,
-	9491,
-	11201,
-	11432,
-	12556,
-	13925,
-	14519,
-	16350,
-	16629,
-	18332,
-	18766,
-	20007,
-	21379,
-	21738,
-	23096,
-	23889,
-	24944,
-	26137,
-	26827,
-	28578,
-	29190,
-	30063,
-	31677,
-	31956,
-	33410,
-	34283,
-	35641,
-	35920,
-	37364,
-	38557,
-	38991,
-	40742,
-	41735,
-	42094,
-	43708,
-	44501,
-	45169,
-	46872,
-	47562,
-	48803,
-	49544,
-	50913,
-	51251,
-	53082,
-	54014,
-	54679
-};
-
-const int EREADER_NYBBLE_5BIT[16][5] = {
-	{ 0, 0, 0, 0, 0 },
-	{ 0, 0, 0, 0, 1 },
-	{ 0, 0, 0, 1, 0 },
-	{ 1, 0, 0, 1, 0 },
-	{ 0, 0, 1, 0, 0 },
-	{ 0, 0, 1, 0, 1 },
-	{ 0, 0, 1, 1, 0 },
-	{ 1, 0, 1, 1, 0 },
-	{ 0, 1, 0, 0, 0 },
-	{ 0, 1, 0, 0, 1 },
-	{ 0, 1, 0, 1, 0 },
-	{ 1, 0, 1, 0, 0 },
-	{ 0, 1, 1, 0, 0 },
-	{ 0, 1, 1, 0, 1 },
-	{ 1, 0, 0, 0, 1 },
-	{ 1, 0, 0, 0, 0 }
-};
-
-const uint8_t EREADER_CALIBRATION_TEMPLATE[] = {
-	0x43, 0x61, 0x72, 0x64, 0x2d, 0x45, 0x20, 0x52, 0x65, 0x61, 0x64, 0x65, 0x72, 0x20, 0x32, 0x30,
-	0x30, 0x31, 0x00, 0x00, 0xcf, 0x72, 0x2f, 0x37, 0x3a, 0x3a, 0x3a, 0x38, 0x33, 0x30, 0x30, 0x37,
-	0x3a, 0x39, 0x37, 0x35, 0x33, 0x2f, 0x2f, 0x34, 0x36, 0x36, 0x37, 0x36, 0x34, 0x31, 0x2d, 0x30,
-	0x32, 0x34, 0x35, 0x35, 0x34, 0x30, 0x2a, 0x2d, 0x2d, 0x2f, 0x31, 0x32, 0x31, 0x2f, 0x29, 0x2a,
-	0x2c, 0x2b, 0x2c, 0x2e, 0x2e, 0x2d, 0x18, 0x2d, 0x8f, 0x03, 0x00, 0x00, 0xc0, 0xfd, 0x77, 0x00,
-	0x00, 0x00, 0x01
-};
 
 static void _readPins(struct GBACartridgeHardware* hw);
 static void _outputPins(struct GBACartridgeHardware* hw, unsigned pins);
@@ -121,11 +33,6 @@ static uint16_t _gbpRead(struct mKeyCallback*);
 static uint16_t _gbpSioWriteRegister(struct GBASIODriver* driver, uint32_t address, uint16_t value);
 static void _gbpSioProcessEvents(struct mTiming* timing, void* user, uint32_t cyclesLate);
 
-static void _eReaderReset(struct GBACartridgeHardware* hw);
-static void _eReaderWriteControl0(struct GBACartridgeHardware* hw, uint8_t value);
-static void _eReaderWriteControl1(struct GBACartridgeHardware* hw, uint8_t value);
-static void _eReaderReadData(struct GBACartridgeHardware* hw);
-
 static const int RTC_BYTES[8] = {
 	1, // Status register 1
 	1, // Duty/alarm 1
@@ -140,6 +47,7 @@ static const int RTC_BYTES[8] = {
 void GBAHardwareInit(struct GBACartridgeHardware* hw, uint16_t* base) {
 	hw->gpioBase = base;
 	hw->eReaderDots = NULL;
+	memset(hw->eReaderCards, 0, sizeof(hw->eReaderCards));
 	GBAHardwareClear(hw);
 
 	hw->gbpCallback.d.readKeys = _gbpRead;
@@ -166,6 +74,15 @@ void GBAHardwareClear(struct GBACartridgeHardware* hw) {
 		mappedMemoryFree(hw->eReaderDots, EREADER_DOTCODE_SIZE);
 		hw->eReaderDots = NULL;
 	}
+	int i;
+	for (i = 0; i < EREADER_CARDS_MAX; ++i) {
+		if (!hw->eReaderCards[i].data) {
+			continue;
+		}
+		free(hw->eReaderCards[i].data);
+		hw->eReaderCards[i].data = NULL;
+		hw->eReaderCards[i].size = 0;
+	}
 
 	if (hw->p->sio.drivers.normal == &hw->gbpDriver.d) {
 		GBASIOSetDriver(&hw->p->sio, 0, SIO_NORMAL_32);
@@ -684,357 +601,6 @@ void _gbpSioProcessEvents(struct mTiming* timing, void* user, uint32_t cyclesLat
 	gbp->p->p->memory.io[REG_SIOCNT >> 1] = gbp->d.p->siocnt & ~0x0080;
 }
 
-// == e-Reader
-
-void GBAHardwareInitEReader(struct GBACartridgeHardware* hw) {
-	hw->devices |= HW_EREADER;
-	_eReaderReset(hw);
-
-	if (hw->p->memory.savedata.data[0xD000] == 0xFF) {
-		memset(&hw->p->memory.savedata.data[0xD000], 0, 0x1000);
-		memcpy(&hw->p->memory.savedata.data[0xD000], EREADER_CALIBRATION_TEMPLATE, sizeof(EREADER_CALIBRATION_TEMPLATE));
-	}
-	if (hw->p->memory.savedata.data[0xE000] == 0xFF) {
-		memset(&hw->p->memory.savedata.data[0xE000], 0, 0x1000);
-		memcpy(&hw->p->memory.savedata.data[0xE000], EREADER_CALIBRATION_TEMPLATE, sizeof(EREADER_CALIBRATION_TEMPLATE));
-	}
-}
-
-void GBAHardwareEReaderWrite(struct GBACartridgeHardware* hw, uint32_t address, uint16_t value) {
-	address &= 0x700FF;
-	switch (address >> 17) {
-	case 0:
-		hw->eReaderRegisterUnk = value & 0xF;
-		break;
-	case 1:
-		hw->eReaderRegisterReset = (value & 0x8A) | 4;
-		if (value & 2) {
-			_eReaderReset(hw);
-		}
-		break;
-	case 2:
-		mLOG(GBA_HW, GAME_ERROR, "e-Reader write to read-only registers: %05X:%04X", address, value);
-		break;
-	default:
-		mLOG(GBA_HW, STUB, "Unimplemented e-Reader write: %05X:%04X", address, value);
-	}
-}
-
-void GBAHardwareEReaderWriteFlash(struct GBACartridgeHardware* hw, uint32_t address, uint8_t value) {
-	address &= 0xFFFF;
-	switch (address) {
-	case 0xFFB0:
-		_eReaderWriteControl0(hw, value);
-		break;
-	case 0xFFB1:
-		_eReaderWriteControl1(hw, value);
-		break;
-	case 0xFFB2:
-		hw->eReaderRegisterLed &= 0xFF00;
-		hw->eReaderRegisterLed |= value;
-		break;
-	case 0xFFB3:
-		hw->eReaderRegisterLed &= 0x00FF;
-		hw->eReaderRegisterLed |= value << 8;
-		break;
-	default:
-		mLOG(GBA_HW, STUB, "Unimplemented e-Reader write to flash: %04X:%02X", address, value);
-	}
-}
-
-uint16_t GBAHardwareEReaderRead(struct GBACartridgeHardware* hw, uint32_t address) {
-	address &= 0x700FF;
-	uint16_t value;
-	switch (address >> 17) {
-	case 0:
-		return hw->eReaderRegisterUnk;
-	case 1:
-		return hw->eReaderRegisterReset;
-	case 2:
-		if (address > 0x40088) {
-			return 0;
-		}
-		LOAD_16(value, address & 0xFE, hw->eReaderData);
-		return value;
-	}
-	mLOG(GBA_HW, STUB, "Unimplemented e-Reader read: %05X", address);
-	return 0;
-}
-
-uint8_t GBAHardwareEReaderReadFlash(struct GBACartridgeHardware* hw, uint32_t address) {
-	address &= 0xFFFF;
-	switch (address) {
-	case 0xFFB0:
-		return hw->eReaderRegisterControl0;
-	case 0xFFB1:
-		return hw->eReaderRegisterControl1;
-	default:
-		mLOG(GBA_HW, STUB, "Unimplemented e-Reader read from flash: %04X", address);
-		return 0;
-	}
-}
-
-static void _eReaderAnchor(uint8_t* origin) {
-	origin[EREADER_DOTCODE_STRIDE * 0 + 1] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 0 + 2] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 0 + 3] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 1 + 0] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 1 + 1] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 1 + 2] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 1 + 3] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 1 + 4] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 2 + 0] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 2 + 1] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 2 + 2] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 2 + 3] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 2 + 4] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 3 + 0] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 3 + 1] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 3 + 2] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 3 + 3] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 3 + 4] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 4 + 1] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 4 + 2] = 1;
-	origin[EREADER_DOTCODE_STRIDE * 4 + 3] = 1;
-}
-
-static void _eReaderAlignment(uint8_t* origin) {
-	origin[8] = 1;
-	origin[10] = 1;
-	origin[12] = 1;
-	origin[14] = 1;
-	origin[16] = 1;
-	origin[18] = 1;
-	origin[21] = 1;
-	origin[23] = 1;
-	origin[25] = 1;
-	origin[27] = 1;
-	origin[29] = 1;
-	origin[31] = 1;
-}
-
-static void _eReaderAddress(uint8_t* origin, int a) {
-	origin[EREADER_DOTCODE_STRIDE * 7 + 2] = 1;
-	uint16_t addr = EREADER_ADDRESS_CODES[a];
-	int i;
-	for (i = 0; i < 16; ++i) {
-		origin[EREADER_DOTCODE_STRIDE * (16 + i) + 2] = (addr >> (15 - i)) & 1;
-	}
-}
-
-void GBAHardwareEReaderScan(struct GBACartridgeHardware* hw, const void* data, size_t size) {
-	if (!hw->eReaderDots) {
-		hw->eReaderDots = anonymousMemoryMap(EREADER_DOTCODE_SIZE);
-	}
-	memset(hw->eReaderDots, 0, EREADER_DOTCODE_SIZE);
-
-	int base;
-	switch (size) {
-	case 2912:
-		base = 25;
-		break;
-	case 1872:
-		base = 1;
-		break;
-	default:
-		return;
-	}
-
-	size_t i;
-	for (i = 0; i < (size / 104) + 1; ++i) {
-		uint8_t* origin = &hw->eReaderDots[35 * i + 200];
-		_eReaderAnchor(&origin[EREADER_DOTCODE_STRIDE * 0]);
-		_eReaderAnchor(&origin[EREADER_DOTCODE_STRIDE * 35]);
-		_eReaderAddress(origin, base + i);
-	}
-	for (i = 0; i < size / 104; ++i) {
-		uint8_t block[1040];
-		uint8_t* origin = &hw->eReaderDots[35 * i + 200];
-		_eReaderAlignment(&origin[EREADER_DOTCODE_STRIDE * 2]);
-		_eReaderAlignment(&origin[EREADER_DOTCODE_STRIDE * 37]);
-
-		int b;
-		for (b = 0; b < 104; ++b) {
-			const int* nybble5;
-			nybble5 = EREADER_NYBBLE_5BIT[((const uint8_t*) data)[i * 104 + b] >> 4];
-			block[b * 10 + 0] = nybble5[0];
-			block[b * 10 + 1] = nybble5[1];
-			block[b * 10 + 2] = nybble5[2];
-			block[b * 10 + 3] = nybble5[3];
-			block[b * 10 + 4] = nybble5[4];
-			nybble5 = EREADER_NYBBLE_5BIT[((const uint8_t*) data)[i * 104 + b] & 0xF];
-			block[b * 10 + 5] = nybble5[0];
-			block[b * 10 + 6] = nybble5[1];
-			block[b * 10 + 7] = nybble5[2];
-			block[b * 10 + 8] = nybble5[3];
-			block[b * 10 + 9] = nybble5[4];
-		}
-
-		b = 0;
-		int y;
-		for (y = 0; y < 3; ++y) {
-			memcpy(&origin[EREADER_DOTCODE_STRIDE * (4 + y) + 7], &block[b], 26);
-			b += 26;
-		}
-		for (y = 0; y < 26; ++y) {
-			memcpy(&origin[EREADER_DOTCODE_STRIDE * (7 + y) + 3], &block[b], 34);
-			b += 34;
-		}
-		for (y = 0; y < 3; ++y) {
-			memcpy(&origin[EREADER_DOTCODE_STRIDE * (33 + y) + 7], &block[b], 26);
-			b += 26;
-		}
-	}
-	hw->eReaderX = -24;
-}
-
-void _eReaderReset(struct GBACartridgeHardware* hw) {
-	memset(hw->eReaderData, 0, sizeof(hw->eReaderData));
-	hw->eReaderRegisterUnk = 0;
-	hw->eReaderRegisterReset = 4;
-	hw->eReaderRegisterControl0 = 0;
-	hw->eReaderRegisterControl1 = 0x80;
-	hw->eReaderRegisterLed = 0;
-	hw->eReaderState = 0;
-	hw->eReaderActiveRegister = 0;
-}
-
-void _eReaderWriteControl0(struct GBACartridgeHardware* hw, uint8_t value) {
-	EReaderControl0 control = value & 0x7F;
-	EReaderControl0 oldControl = hw->eReaderRegisterControl0;
-	if (hw->eReaderState == EREADER_SERIAL_INACTIVE) {
-		if (EReaderControl0IsClock(oldControl) && EReaderControl0IsData(oldControl) && !EReaderControl0IsData(control)) {
-			hw->eReaderState = EREADER_SERIAL_STARTING;
-		}
-	} else if (EReaderControl0IsClock(oldControl) && !EReaderControl0IsData(oldControl) && EReaderControl0IsData(control)) {
-		hw->eReaderState = EREADER_SERIAL_INACTIVE;
-
-	} else if (hw->eReaderState == EREADER_SERIAL_STARTING) {
-		if (EReaderControl0IsClock(oldControl) && !EReaderControl0IsData(oldControl) && !EReaderControl0IsClock(control)) {
-			hw->eReaderState = EREADER_SERIAL_BIT_0;
-			hw->eReaderCommand = EREADER_COMMAND_IDLE;
-		}
-	} else if (EReaderControl0IsClock(oldControl) && !EReaderControl0IsClock(control)) {
-		mLOG(GBA_HW, DEBUG, "[e-Reader] Serial falling edge: %c %i", EReaderControl0IsDirection(control) ? '>' : '<', EReaderControl0GetData(control));
-		// TODO: Improve direction control
-		if (EReaderControl0IsDirection(control)) {
-			hw->eReaderByte |= EReaderControl0GetData(control) << (7 - (hw->eReaderState - EREADER_SERIAL_BIT_0));
-			++hw->eReaderState;
-			if (hw->eReaderState == EREADER_SERIAL_END_BIT) {
-				mLOG(GBA_HW, DEBUG, "[e-Reader] Wrote serial byte: %02x", hw->eReaderByte);
-				switch (hw->eReaderCommand) {
-				case EREADER_COMMAND_IDLE:
-					hw->eReaderCommand = hw->eReaderByte;
-					break;
-				case EREADER_COMMAND_SET_INDEX:
-					hw->eReaderActiveRegister = hw->eReaderByte;
-					hw->eReaderCommand = EREADER_COMMAND_WRITE_DATA;
-					break;
-				case EREADER_COMMAND_WRITE_DATA:
-					switch (hw->eReaderActiveRegister & 0x7F) {
-					case 0:
-					case 0x57:
-					case 0x58:
-					case 0x59:
-					case 0x5A:
-						// Read-only
-						mLOG(GBA_HW, GAME_ERROR, "Writing to read-only e-Reader serial register: %02X", hw->eReaderActiveRegister);
-						break;
-					default:
-						if ((hw->eReaderActiveRegister & 0x7F) > 0x5A) {
-							mLOG(GBA_HW, GAME_ERROR, "Writing to non-existent e-Reader serial register: %02X", hw->eReaderActiveRegister);
-							break;
-						}
-						hw->eReaderSerial[hw->eReaderActiveRegister & 0x7F] = hw->eReaderByte;
-						break;
-					}
-					++hw->eReaderActiveRegister;
-					break;
-				default:
-					mLOG(GBA_HW, ERROR, "Hit undefined state %02X in e-Reader state machine", hw->eReaderCommand);
-					break;
-				}
-				hw->eReaderState = EREADER_SERIAL_BIT_0;
-				hw->eReaderByte = 0;
-			}
-		} else if (hw->eReaderCommand == EREADER_COMMAND_READ_DATA) {
-			int bit = hw->eReaderSerial[hw->eReaderActiveRegister & 0x7F] >> (7 - (hw->eReaderState - EREADER_SERIAL_BIT_0));
-			control = EReaderControl0SetData(control, bit);
-			++hw->eReaderState;
-			if (hw->eReaderState == EREADER_SERIAL_END_BIT) {
-				++hw->eReaderActiveRegister;
-				mLOG(GBA_HW, DEBUG, "[e-Reader] Read serial byte: %02x", hw->eReaderSerial[hw->eReaderActiveRegister & 0x7F]);
-			}
-		}
-	} else if (!EReaderControl0IsDirection(control)) {
-		// Clear the error bit
-		control = EReaderControl0ClearData(control);
-	}
-	hw->eReaderRegisterControl0 = control;
-	if (!EReaderControl0IsScan(oldControl) && EReaderControl0IsScan(control)) {
-		hw->eReaderX = 0;
-		hw->eReaderY = 0;
-	} else if (EReaderControl0IsLedEnable(control) && EReaderControl0IsScan(control) && !EReaderControl1IsScanline(hw->eReaderRegisterControl1)) {
-		_eReaderReadData(hw);
-	}
-	mLOG(GBA_HW, STUB, "Unimplemented e-Reader Control0 write: %02X", value);
-}
-
-void _eReaderWriteControl1(struct GBACartridgeHardware* hw, uint8_t value) {
-	EReaderControl1 control = (value & 0x32) | 0x80;
-	hw->eReaderRegisterControl1 = control;
-	if (EReaderControl0IsScan(hw->eReaderRegisterControl0) && !EReaderControl1IsScanline(control)) {
-		++hw->eReaderY;
-		if (hw->eReaderY == (hw->eReaderSerial[0x15] | (hw->eReaderSerial[0x14] << 8))) {
-			hw->eReaderY = 0;
-			if (hw->eReaderX < 3400) {
-				hw->eReaderX += 220;
-			}
-		}
-		_eReaderReadData(hw);
-	}
-	mLOG(GBA_HW, STUB, "Unimplemented e-Reader Control1 write: %02X", value);
-}
-
-void _eReaderReadData(struct GBACartridgeHardware* hw) {
-	memset(hw->eReaderData, 0, EREADER_BLOCK_SIZE);
-	if (hw->eReaderDots) {
-		int y = hw->eReaderY - 10;
-		if (y < 0 || y >= 120) {
-			memset(hw->eReaderData, 0, EREADER_BLOCK_SIZE);
-		} else {
-			int i;
-			uint8_t* origin = &hw->eReaderDots[EREADER_DOTCODE_STRIDE * (y / 3) + 16];
-			for (i = 0; i < 20; ++i) {
-				uint16_t word = 0;
-				int x = hw->eReaderX + i * 16;
-				word |= origin[(x +  0) / 3] << 8;
-				word |= origin[(x +  1) / 3] << 9;
-				word |= origin[(x +  2) / 3] << 10;
-				word |= origin[(x +  3) / 3] << 11;
-				word |= origin[(x +  4) / 3] << 12;
-				word |= origin[(x +  5) / 3] << 13;
-				word |= origin[(x +  6) / 3] << 14;
-				word |= origin[(x +  7) / 3] << 15;
-				word |= origin[(x +  8) / 3];
-				word |= origin[(x +  9) / 3] << 1;
-				word |= origin[(x + 10) / 3] << 2;
-				word |= origin[(x + 11) / 3] << 3;
-				word |= origin[(x + 12) / 3] << 4;
-				word |= origin[(x + 13) / 3] << 5;
-				word |= origin[(x + 14) / 3] << 6;
-				word |= origin[(x + 15) / 3] << 7;
-				STORE_16(word, (19 - i) << 1, hw->eReaderData);
-			}
-		}
-	}
-	hw->eReaderRegisterControl1 = EReaderControl1FillScanline(hw->eReaderRegisterControl1);
-	if (EReaderControl0IsLedEnable(hw->eReaderRegisterControl0)) {
-		uint16_t led = 2754; // TODO: Figure out why this breaks if using the LED register
-		GBARaiseIRQ(hw->p, IRQ_GAMEPAK, -led);
-	}
-}
-
 // == Serialization
 
 void GBAHardwareSerialize(const struct GBACartridgeHardware* hw, struct GBASerializedState* state) {
diff --git a/src/platform/qt/CoreController.cpp b/src/platform/qt/CoreController.cpp
index ac4e5914e..392360522 100644
--- a/src/platform/qt/CoreController.cpp
+++ b/src/platform/qt/CoreController.cpp
@@ -670,13 +670,25 @@ void CoreController::setFakeEpoch(const QDateTime& time) {
 
 void CoreController::scanCard(const QString& path) {
 #ifdef M_CORE_GBA
-	QFile file(path);
-	file.open(QIODevice::ReadOnly);
-	m_eReaderData = file.read(2912);
+	QImage image(path);
+	if (image.isNull()) {
+		QFile file(path);
+		file.open(QIODevice::ReadOnly);
+		m_eReaderData = file.read(2912);
+	} else if (image.size() == QSize(989, 44)) {
+		const uchar* bits = image.constBits();
+		size_t size;
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+		size = image.sizeInBytes();
+#else
+		size = image.byteCount();
+#endif
+		m_eReaderData.setRawData(reinterpret_cast<const char*>(bits), image.sizeInBytes());
+	}
 
 	mCoreThreadRunFunction(&m_threadContext, [](mCoreThread* thread) {
 		CoreController* controller = static_cast<CoreController*>(thread->userData);
-		GBAHardwareEReaderScan(&static_cast<GBA*>(thread->core->board)->memory.hw, controller->m_eReaderData.constData(), controller->m_eReaderData.size());
+		GBAEReaderQueueCard(static_cast<GBA*>(thread->core->board), controller->m_eReaderData.constData(), controller->m_eReaderData.size());
 	});
 #endif
 }
diff --git a/src/platform/qt/DiscordCoordinator.cpp b/src/platform/qt/DiscordCoordinator.cpp
index 8948cdd50..e438141bf 100644
--- a/src/platform/qt/DiscordCoordinator.cpp
+++ b/src/platform/qt/DiscordCoordinator.cpp
@@ -30,6 +30,7 @@ static void updatePresence() {
 		DiscordRichPresence discordPresence{};
 		discordPresence.details = s_title.toUtf8().constData();
 		discordPresence.instance = 1;
+		discordPresence.largeImageKey = "mgba";
 		Discord_UpdatePresence(&discordPresence);
 	} else {
 		Discord_ClearPresence();
diff --git a/src/platform/qt/DisplayGL.cpp b/src/platform/qt/DisplayGL.cpp
index 1f129a56a..2c2cf4c92 100644
--- a/src/platform/qt/DisplayGL.cpp
+++ b/src/platform/qt/DisplayGL.cpp
@@ -330,8 +330,8 @@ PainterGL::PainterGL(QWindow* surface, QOpenGLContext* parent, int forceVersion)
 	m_backend->lockAspectRatio = false;
 	m_backend->interframeBlending = false;
 
-	for (int i = 0; i < 2; ++i) {
-		m_free.append(new uint32_t[256 * 512]);
+	for (int i = 0; i < 3; ++i) {
+		m_free.append(new uint32_t[1024 * 2048]);
 	}
 }
 
@@ -426,6 +426,7 @@ void PainterGL::start() {
 	}
 #endif
 
+	m_buffer = nullptr;
 	m_active = true;
 	m_started = true;
 }
@@ -493,6 +494,11 @@ void PainterGL::performDraw() {
 	m_painter.beginNativePainting();
 	float r = m_surface->devicePixelRatio();
 	m_backend->resized(m_backend, m_size.width() * r, m_size.height() * r);
+	if (m_buffer) {
+		m_backend->postFrame(m_backend, m_buffer);
+		m_free.append(m_buffer);
+		m_buffer = nullptr;
+	}
 	m_backend->drawFrame(m_backend);
 	m_painter.endNativePainting();
 	if (m_showOSD && m_messagePainter) {
@@ -523,9 +529,12 @@ void PainterGL::dequeue() {
 		return;
 	}
 	uint32_t* buffer = m_queue.dequeue();
+	if (m_buffer) {
+		m_free.append(m_buffer);
+		m_buffer = nullptr;
+	}
 	if (buffer) {
-		m_backend->postFrame(m_backend, buffer);
-		m_free.append(buffer);
+		m_buffer = buffer;
 	}
 	m_mutex.unlock();
 }
@@ -542,6 +551,10 @@ void PainterGL::dequeueAll() {
 	if (buffer) {
 		m_backend->postFrame(m_backend, buffer);
 	}
+	if (m_buffer) {
+		m_free.append(m_buffer);
+		m_buffer = nullptr;
+	}
 	m_mutex.unlock();
 }
 
diff --git a/src/platform/qt/DisplayGL.h b/src/platform/qt/DisplayGL.h
index 1ef943a95..6948eec96 100644
--- a/src/platform/qt/DisplayGL.h
+++ b/src/platform/qt/DisplayGL.h
@@ -121,6 +121,7 @@ private:
 
 	QList<uint32_t*> m_free;
 	QQueue<uint32_t*> m_queue;
+	uint32_t* m_buffer;
 	QPainter m_painter;
 	QMutex m_mutex;
 	QWindow* m_surface;
diff --git a/src/platform/qt/GBAApp.cpp b/src/platform/qt/GBAApp.cpp
index 32d4d4d9e..b1a058fe3 100644
--- a/src/platform/qt/GBAApp.cpp
+++ b/src/platform/qt/GBAApp.cpp
@@ -163,6 +163,17 @@ QString GBAApp::getOpenFileName(QWidget* owner, const QString& title, const QStr
 	return filename;
 }
 
+QStringList GBAApp::getOpenFileNames(QWidget* owner, const QString& title, const QString& filter) {
+	QList<Window*> paused;
+	pauseAll(&paused);
+	QStringList filenames = QFileDialog::getOpenFileNames(owner, title, m_configController->getOption("lastDirectory"), filter);
+	continueAll(paused);
+	if (!filenames.isEmpty()) {
+		m_configController->setOption("lastDirectory", QFileInfo(filenames.at(0)).dir().canonicalPath());
+	}
+	return filenames;
+}
+
 QString GBAApp::getSaveFileName(QWidget* owner, const QString& title, const QString& filter) {
 	QList<Window*> paused;
 	pauseAll(&paused);
diff --git a/src/platform/qt/GBAApp.h b/src/platform/qt/GBAApp.h
index 82c25593c..805941f3b 100644
--- a/src/platform/qt/GBAApp.h
+++ b/src/platform/qt/GBAApp.h
@@ -59,6 +59,7 @@ public:
 	Window* newWindow();
 
 	QString getOpenFileName(QWidget* owner, const QString& title, const QString& filter = QString());
+	QStringList getOpenFileNames(QWidget* owner, const QString& title, const QString& filter = QString());
 	QString getSaveFileName(QWidget* owner, const QString& title, const QString& filter = QString());
 	QString getOpenDirectoryName(QWidget* owner, const QString& title);
 
diff --git a/src/platform/qt/Window.cpp b/src/platform/qt/Window.cpp
index dea566fd4..aa92649cf 100644
--- a/src/platform/qt/Window.cpp
+++ b/src/platform/qt/Window.cpp
@@ -473,8 +473,8 @@ void Window::selectPatch() {
 }
 
 void Window::scanCard() {
-	QString filename = GBAApp::app()->getOpenFileName(this, tr("Select e-Reader dotcode"));
-	if (!filename.isEmpty()) {
+	QStringList filenames = GBAApp::app()->getOpenFileNames(this, tr("Select e-Reader dotcode"), tr("e-Reader card (*.raw *.bin *.bmp)"));
+	for (QString& filename : filenames) {
 		m_controller->scanCard(filename);
 	}
 }
@@ -1192,7 +1192,7 @@ void Window::setupMenu(QMenuBar* menubar) {
 
 	addGameAction(tr("Replace ROM..."), "replaceROM", this, &Window::replaceROM, "file");
 #ifdef M_CORE_GBA
-	Action* scanCard = addGameAction(tr("Scan e-Reader dotcode..."), "scanCard", this, &Window::scanCard, "file");
+	Action* scanCard = addGameAction(tr("Scan e-Reader dotcodes..."), "scanCard", this, &Window::scanCard, "file");
 	m_platformActions.insert(PLATFORM_GBA, scanCard);
 #endif