diff --git a/data/gameinfo.json b/data/gameinfo.json
index e8249cd..c568e10 100644
--- a/data/gameinfo.json
+++ b/data/gameinfo.json
@@ -9,9 +9,7 @@
 			"identifiers":    [ "darkhleg" ],
 
 			"name": "Dark Horse Legend",
-			"year": 1998,
-
-			"flags": {}
+			"year": 1998
 		},
 		{
 			"specifications": [ "GQ" ],
@@ -70,9 +68,7 @@
 			"identifiers":    [ "powyakex" ],
 
 			"name": "Jikkyou Powerful Pro Yakyuu EX",
-			"year": 1998,
-
-			"flags": {}
+			"year": 1998
 		},
 		{
 			"specifications": [ "GC" ],
@@ -81,9 +77,7 @@
 			"identifiers":    [ "jppyex98" ],
 
 			"name": "Jikkyou Powerful Pro Yakyuu EX '98",
-			"year": 1998,
-
-			"flags": {}
+			"year": 1998
 		},
 		{
 			"specifications": [ "GC" ],
@@ -92,9 +86,7 @@
 			"identifiers":    [ "konam80sa", "konam80s", "konam80sk", "konam80su" ],
 
 			"name": "Konami 80's AC Special",
-			"year": 1998,
-
-			"flags": {}
+			"year": 1998
 		},
 		{
 			"specifications": [ "GC" ],
@@ -103,9 +95,7 @@
 			"identifiers":    [ "konam80sj" ],
 
 			"name": "Konami 80's Gallery",
-			"year": 1998,
-
-			"flags": {}
+			"year": 1998
 		},
 		{
 			"specifications": [ "GC", "GN" ],
@@ -244,9 +234,7 @@
 			"identifiers":    [ "gchgchmp" ],
 
 			"name": "Gachaga Champ",
-			"year": 1999,
-
-			"flags": {}
+			"year": 1999
 		},
 		{
 			"specifications": [ "GQ" ],
@@ -506,9 +494,7 @@
 			"identifiers":    [ "hypbbc2p", "hypbbc2pk" ],
 
 			"name": "Hyper Bishi Bashi Champ [2-player]",
-			"year": 1999,
-
-			"flags": {}
+			"year": 1999
 		},
 		{
 			"specifications": [ "GC" ],
@@ -580,7 +566,11 @@
 			"series": "PunchMania",
 			"year":   2000,
 
-			"ioBoard": "GX700-PWB(F)"
+			"ioBoard": "GX700-PWB(F)",
+
+			"gameCart": {
+				"pcb": "GX700-PWB(J)"
+			}
 		},
 		{
 			"specifications": [ "GQ" ],
@@ -592,7 +582,11 @@
 			"series": "PunchMania",
 			"year":   2000,
 
-			"ioBoard": "GX700-PWB(F)"
+			"ioBoard": "GX700-PWB(F)",
+
+			"gameCart": {
+				"pcb": "GX700-PWB(J)"
+			}
 		},
 		{
 			"specifications": [ "GQ" ],
@@ -636,9 +630,7 @@
 			"identifiers":    [ "stepchmp" ],
 
 			"name": "Step Champ",
-			"year": 1999,
-
-			"flags": {}
+			"year": 1999
 		},
 		{
 			"specifications": [ "GE", "GK" ],
@@ -706,9 +698,7 @@
 			"identifiers":    [ "animechmp" ],
 
 			"name": "Anime Champ",
-			"year": 2000,
-
-			"flags": {}
+			"year": 2000
 		},
 		{
 			"specifications": [ "GQ" ],
@@ -720,7 +710,11 @@
 			"series": "PunchMania",
 			"year":   2000,
 
-			"ioBoard": "GX700-PWB(F)"
+			"ioBoard": "GX700-PWB(F)",
+
+			"gameCart": {
+				"pcb": "GX700-PWB(J)"
+			}
 		},
 		{
 			"specifications": [ "GQ" ],
@@ -732,7 +726,11 @@
 			"series": "PunchMania",
 			"year":   2000,
 
-			"ioBoard": "GX700-PWB(F)"
+			"ioBoard": "GX700-PWB(F)",
+
+			"gameCart": {
+				"pcb": "GX700-PWB(J)"
+			}
 		},
 		{
 			"specifications": [ "GC" ],
@@ -754,7 +752,9 @@
 			"name": "Salary Man Champ [2-player]",
 			"year": 2000,
 
-			"flags": {}
+			"gameCart": {
+				"pcb": "PWB0000088954"
+			}
 		},
 		{
 			"specifications": [ "GC" ],
@@ -1047,9 +1047,7 @@
 			"identifiers":    [ "gbbchmp" ],
 
 			"name": "Great Bishi Bashi Champ",
-			"year": 2002,
-
-			"flags": {}
+			"year": 2002
 		},
 		{
 			"specifications": [ "GC" ],
diff --git a/src/common/fs/fat.cpp b/src/common/fs/fat.cpp
index ca72e0c..2b88e8d 100644
--- a/src/common/fs/fat.cpp
+++ b/src/common/fs/fat.cpp
@@ -258,6 +258,17 @@ File *FATProvider::openFile(const char *path, uint32_t flags) {
 	return file;
 }
 
+bool FATProvider::deleteFile(const char *path) {
+	auto error = f_unlink(&_fs, path);
+
+	if (error) {
+		LOG_FS("%s: %s", _FATFS_ERROR_NAMES[error], path);
+		return false;
+	}
+
+	return true;
+}
+
 /* FatFs library API glue */
 
 static constexpr int _MUTEX_TIMEOUT = 30000000;
diff --git a/src/common/fs/fat.hpp b/src/common/fs/fat.hpp
index 07ab79d..1b87b26 100644
--- a/src/common/fs/fat.hpp
+++ b/src/common/fs/fat.hpp
@@ -72,6 +72,7 @@ public:
 	bool createDirectory(const char *path);
 
 	File *openFile(const char *path, uint32_t flags);
+	bool deleteFile(const char *path);
 };
 
 }
diff --git a/src/common/fs/file.hpp b/src/common/fs/file.hpp
index 5dd6843..7f9e6ee 100644
--- a/src/common/fs/file.hpp
+++ b/src/common/fs/file.hpp
@@ -148,6 +148,7 @@ public:
 	virtual bool createDirectory(const char *path) { return false; }
 
 	virtual File *openFile(const char *path, uint32_t flags) { return nullptr; }
+	virtual bool deleteFile(const char *path) { return false; }
 	virtual size_t loadData(util::Data &output, const char *path);
 	virtual size_t loadData(void *output, size_t length, const char *path);
 	virtual size_t saveData(const void *input, size_t length, const char *path);
diff --git a/src/common/fs/iso9660.cpp b/src/common/fs/iso9660.cpp
index 0498359..8ba5d33 100644
--- a/src/common/fs/iso9660.cpp
+++ b/src/common/fs/iso9660.cpp
@@ -385,7 +385,8 @@ bool ISO9660Provider::_getRecord(
 }
 
 bool ISO9660Provider::init(storage::Device &dev) {
-	_dev = &dev;
+	if (type)
+		return false;
 
 	// Locate and parse the primary volume descriptor.
 	size_t numPVDSectors = util::min(
@@ -425,6 +426,7 @@ bool ISO9660Provider::init(storage::Device &dev) {
 
 		type     = ISO9660;
 		capacity = uint64_t(pvd->volumeLength.le) * _dev->sectorLength;
+		_dev     = &dev;
 
 		LOG_FS("mounted ISO: %s", volumeLabel);
 		return true;
diff --git a/src/common/fs/misc.cpp b/src/common/fs/misc.cpp
index 32feb9b..3a7c685 100644
--- a/src/common/fs/misc.cpp
+++ b/src/common/fs/misc.cpp
@@ -182,6 +182,17 @@ File *HostProvider::openFile(const char *path, uint32_t flags) {
 	return file;
 }
 
+bool HostProvider::deleteFile(const char *path) {
+	int error = pcdrvUnlink(path);
+
+	if (error < 0) {
+		LOG_FS("PCDRV error %d: %s", error, path);
+		return false;
+	}
+
+	return true;
+}
+
 /* Virtual filesystem driver */
 
 VFSMountPoint *VFSProvider::_getMounted(const char *path) {
@@ -311,6 +322,15 @@ File *VFSProvider::openFile(const char *path, uint32_t flags) {
 	return mp->provider->openFile(&path[mp->pathOffset], flags);
 }
 
+bool VFSProvider::deleteFile(const char *path) {
+	auto mp = _getMounted(path);
+
+	if (!mp)
+		return false;
+
+	return mp->provider->deleteFile(&path[mp->pathOffset]);
+}
+
 size_t VFSProvider::loadData(util::Data &output, const char *path) {
 	auto mp = _getMounted(path);
 
diff --git a/src/common/fs/misc.hpp b/src/common/fs/misc.hpp
index 4cc9410..eeb8861 100644
--- a/src/common/fs/misc.hpp
+++ b/src/common/fs/misc.hpp
@@ -61,6 +61,7 @@ public:
 	bool createDirectory(const char *path);
 
 	File *openFile(const char *path, uint32_t flags);
+	bool deleteFile(const char *path);
 };
 
 /* Virtual filesystem driver */
@@ -98,6 +99,7 @@ public:
 	bool createDirectory(const char *path);
 
 	File *openFile(const char *path, uint32_t flags);
+	bool deleteFile(const char *path);
 	size_t loadData(util::Data &output, const char *path);
 	size_t loadData(void *output, size_t length, const char *path);
 	size_t saveData(const void *input, size_t length, const char *path);
diff --git a/src/common/fs/package.cpp b/src/common/fs/package.cpp
index 6ebb320..832bdcc 100644
--- a/src/common/fs/package.cpp
+++ b/src/common/fs/package.cpp
@@ -129,6 +129,7 @@ bool PackageProvider::getFileInfo(FileInfo &output, const char *path) {
 	__builtin_strncpy(output.name, ptr, sizeof(output.name));
 	output.size       = entry->uncompLength;
 	output.attributes = READ_ONLY | ARCHIVE;
+
 	return true;
 }
 
diff --git a/src/common/gpu.cpp b/src/common/gpu.cpp
index 3ca74e8..94b0ff6 100644
--- a/src/common/gpu.cpp
+++ b/src/common/gpu.cpp
@@ -32,6 +32,18 @@ namespace gpu {
 static constexpr int _DMA_CHUNK_SIZE = 1;
 static constexpr int _DMA_TIMEOUT    = 10000;
 
+void init(void) {
+	DMA_DPCR |= 0
+		| (DMA_DPCR_ENABLE << (DMA_GPU * 4))
+		| (DMA_DPCR_ENABLE << (DMA_OTC * 4));
+
+	TIMER_CTRL(0) = TIMER_CTRL_EXT_CLOCK;
+	TIMER_CTRL(1) = TIMER_CTRL_EXT_CLOCK;
+
+	GPU_GP1 = gp1_resetGPU();
+	GPU_GP1 = gp1_resetFIFO();
+}
+
 size_t upload(const RectWH &rect, const void *data, bool wait) {
 	size_t length = (rect.w * rect.h) / 2;
 
diff --git a/src/common/gpu.hpp b/src/common/gpu.hpp
index a66fc05..ee9eb02 100644
--- a/src/common/gpu.hpp
+++ b/src/common/gpu.hpp
@@ -48,14 +48,6 @@ public:
 
 /* Basic API */
 
-static inline void init(void) {
-	GPU_GP1 = gp1_resetGPU();
-	GPU_GP1 = gp1_resetFIFO();
-
-	TIMER_CTRL(0) = TIMER_CTRL_EXT_CLOCK;
-	TIMER_CTRL(1) = TIMER_CTRL_EXT_CLOCK;
-}
-
 static inline bool isIdle(void) {
 	return (
 		!(DMA_CHCR(DMA_GPU) & DMA_CHCR_ENABLE) && (GPU_GP1 & GP1_STAT_CMD_READY)
@@ -66,6 +58,7 @@ static inline void enableDisplay(bool enable) {
 	GPU_GP1 = gp1_dispBlank(!enable);
 }
 
+void init(void);
 size_t upload(const RectWH &rect, const void *data, bool wait = false);
 size_t download(const RectWH &rect, void *data, bool wait = false);
 
diff --git a/src/common/io.cpp b/src/common/io.cpp
index b28acca..608131c 100644
--- a/src/common/io.cpp
+++ b/src/common/io.cpp
@@ -46,6 +46,7 @@ void init(void) {
 		| (23 << 16) // Number of address lines
 		| ( 4 << 24) // DMA read/write delay
 		| BIU_CTRL_DMA_DELAY;
+	DMA_DPCR     |= DMA_DPCR_ENABLE << (DMA_PIO * 4);
 
 #if 0
 	// Revision D of the main board has footprints for either eight 8-bit RAM
@@ -158,12 +159,12 @@ void getRTCTime(util::Date &output) {
 
 	SYS573_RTC_CTRL &= ~SYS573_RTC_CTRL_READ;
 
-	output.year   = (year   & 15) + 10 * ((year   >> 4) & 15); // 0-99
-	output.month  = (month  & 15) + 10 * ((month  >> 4) &  1); // 1-12
-	output.day    = (day    & 15) + 10 * ((day    >> 4) &  3); // 1-31
-	output.hour   = (hour   & 15) + 10 * ((hour   >> 4) &  3); // 0-23
-	output.minute = (minute & 15) + 10 * ((minute >> 4) &  7); // 0-59
-	output.second = (second & 15) + 10 * ((second >> 4) &  7); // 0-59
+	output.year   = util::decodeBCD(year);   // 0-99
+	output.month  = util::decodeBCD(month);  // 1-12
+	output.day    = util::decodeBCD(day);    // 1-31
+	output.hour   = util::decodeBCD(hour);   // 0-23
+	output.minute = util::decodeBCD(minute); // 0-59
+	output.second = util::decodeBCD(second); // 0-59
 
 	output.year += (output.year < 70) ? 2000 : 1900;
 }
@@ -171,15 +172,13 @@ void getRTCTime(util::Date &output) {
 void setRTCTime(const util::Date &value, bool stop) {
 	assert((value.year >= 1970) && (value.year <= 2069));
 
-	int _year   = value.year % 100;
 	int weekday = value.getDayOfWeek() + 1;
-
-	int year    = (_year        % 10) | (((_year        / 10) & 15) << 4);
-	int month   = (value.month  % 10) | (((value.month  / 10) &  1) << 4);
-	int day     = (value.day    % 10) | (((value.day    / 10) &  3) << 4);
-	int hour    = (value.hour   % 10) | (((value.hour   / 10) &  3) << 4);
-	int minute  = (value.minute % 10) | (((value.minute / 10) &  7) << 4);
-	int second  = (value.second % 10) | (((value.second / 10) &  7) << 4);
+	int year    = util::encodeBCD(value.year % 100);
+	int month   = util::encodeBCD(value.month);
+	int day     = util::encodeBCD(value.day);
+	int hour    = util::encodeBCD(value.hour);
+	int minute  = util::encodeBCD(value.minute);
+	int second  = util::encodeBCD(value.second);
 
 	SYS573_RTC_CTRL |= SYS573_RTC_CTRL_WRITE;
 
diff --git a/src/common/mdec.cpp b/src/common/mdec.cpp
index f339794..67f0ca9 100644
--- a/src/common/mdec.cpp
+++ b/src/common/mdec.cpp
@@ -67,6 +67,10 @@ static constexpr int _DMA_CHUNK_SIZE_OUT = 32;
 static constexpr int _DMA_TIMEOUT        = 100000;
 
 void init(void) {
+	DMA_DPCR |= 0
+		| (DMA_DPCR_ENABLE << (DMA_MDEC_IN  * 4))
+		| (DMA_DPCR_ENABLE << (DMA_MDEC_OUT * 4));
+
 	MDEC1 = MDEC_CTRL_RESET;
 	MDEC1 = MDEC_CTRL_DMA_OUT | MDEC_CTRL_DMA_IN;
 
diff --git a/src/common/rom.cpp b/src/common/rom.cpp
index 7ce1edc..06307d3 100644
--- a/src/common/rom.cpp
+++ b/src/common/rom.cpp
@@ -16,7 +16,6 @@
 
 #include <stddef.h>
 #include <stdint.h>
-#include "common/util/hash.hpp"
 #include "common/util/log.hpp"
 #include "common/util/templates.hpp"
 #include "common/io.hpp"
@@ -417,22 +416,6 @@ static const ShellInfo _KONAMI_SHELLS[]{
 	}
 };
 
-bool SonyKernelHeader::validateMagic(void) const {
-	return (
-		util::hash(magic, sizeof(magic)) == "Sony Computer Entertainment Inc."_h
-	);
-}
-
-bool OpenBIOSHeader::validateMagic(void) const {
-	return (util::hash(magic, sizeof(magic)) == "OpenBIOS"_h);
-}
-
-bool ShellInfo::validateHash(void) const {
-	return (util::hash(
-		reinterpret_cast<const uint8_t *>(header), sizeof(util::ExecutableHeader)
-	) == headerHash);
-}
-
 bool getShellInfo(ShellInfo &output) {
 	for (auto &shell : _KONAMI_SHELLS) {
 		if (!shell.validateHash())
diff --git a/src/common/rom.hpp b/src/common/rom.hpp
index eb1c4ae..9c1a98d 100644
--- a/src/common/rom.hpp
+++ b/src/common/rom.hpp
@@ -21,6 +21,7 @@
 #include "common/util/hash.hpp"
 #include "common/util/misc.hpp"
 #include "common/util/string.hpp"
+#include "common/util/templates.hpp"
 #include "ps1/registers.h"
 
 namespace rom {
@@ -117,20 +118,28 @@ public:
 	uint32_t flags;
 	uint8_t  magic[32], _pad[4], version[36];
 
-	bool validateMagic(void) const;
+	inline bool validateMagic(void) const {
+		return (
+			util::hash(magic, sizeof(magic)) ==
+			"Sony Computer Entertainment Inc."_h
+		);
+	}
+
+
 };
 
 class OpenBIOSHeader {
 public:
-	uint8_t  magic[8];
+	uint32_t magic[2];
 	uint32_t idNameLength, idDescLength, idType;
 	uint8_t  idData[24];
 
+	inline bool validateMagic(void) const {
+		return (magic[0] == "Open"_c) && (magic[1] == "BIOS"_c);
+	}
 	inline size_t getBuildID(char *output) const {
 		return util::hexToString(output, &idData[idNameLength], idDescLength);
 	}
-
-	bool validateMagic(void) const;
 };
 
 class ShellInfo {
@@ -140,7 +149,12 @@ public:
 
 	const util::ExecutableHeader *header;
 
-	bool validateHash(void) const;
+	inline bool validateHash(void) const {
+		return (util::hash(
+			reinterpret_cast<const uint8_t *>(header),
+			sizeof(util::ExecutableHeader)
+		) == headerHash);
+	}
 };
 
 static const auto &sonyKernelHeader =
diff --git a/src/common/spu.cpp b/src/common/spu.cpp
index 0449021..d79bc58 100644
--- a/src/common/spu.cpp
+++ b/src/common/spu.cpp
@@ -51,6 +51,7 @@ void init(void) {
 		| (9 << 16) // Number of address lines
 		| (0 << 24) // DMA read/write delay
 		| BIU_CTRL_DMA_DELAY;
+	DMA_DPCR     |= DMA_DPCR_ENABLE << (DMA_SPU * 4);
 
 	SPU_CTRL = 0;
 	_waitForStatus(0x3f, 0);
diff --git a/src/common/storage/device.hpp b/src/common/storage/device.hpp
index 6d09214..165c539 100644
--- a/src/common/storage/device.hpp
+++ b/src/common/storage/device.hpp
@@ -23,6 +23,48 @@
 
 namespace storage {
 
+/* CD-ROM definitions */
+
+static constexpr uint32_t CDROM_TOC_PREGAP = 150;
+
+class MSF {
+public:
+	uint8_t minute, second, frame;
+
+	inline void fromLBA(uint32_t lba) {
+		lba += CDROM_TOC_PREGAP;
+
+		minute = lba / 4500;
+		second = (lba / 75) % 60;
+		frame  = lba % 75;
+	}
+	inline uint32_t toLBA(void) const {
+		return -CDROM_TOC_PREGAP
+			+ minute * 4500
+			+ second * 75
+			+ frame;
+	}
+};
+
+class BCDMSF {
+public:
+	uint8_t minute, second, frame;
+
+	inline void fromLBA(uint32_t lba) {
+		lba += CDROM_TOC_PREGAP;
+
+		minute = util::encodeBCD(lba / 4500);
+		second = util::encodeBCD((lba / 75) % 60);
+		frame  = util::encodeBCD(lba % 75);
+	}
+	inline uint32_t toLBA(void) const {
+		return -CDROM_TOC_PREGAP
+			+ util::decodeBCD(minute) * 4500
+			+ util::decodeBCD(second) * 75
+			+ util::decodeBCD(frame);
+	}
+};
+
 /* IDE register definitions */
 
 enum IDECS0Register {
diff --git a/src/common/util/templates.hpp b/src/common/util/templates.hpp
index bd75e57..b33e9f6 100644
--- a/src/common/util/templates.hpp
+++ b/src/common/util/templates.hpp
@@ -91,6 +91,8 @@ template<typename T> static constexpr inline size_t countOf(T &array) {
 	return sizeof(array) / sizeof(array[0]);
 }
 
+/* Concatenation and BCD conversion */
+
 static constexpr inline uint16_t concat2(uint8_t low, uint8_t high) {
 	return low | (high << 8);
 }
@@ -130,6 +132,20 @@ static constexpr inline uint64_t concat8(
 		| (uint64_t(g) << 48) | (uint64_t(h) << 56);
 }
 
+static constexpr inline uint8_t encodeBCD(uint8_t value) {
+	// output = units + tens * 16
+	//        = units + tens * 10 + tens * 6
+	//        = value             + tens * 6
+	return value + (value / 10) * 6;
+}
+
+static constexpr inline uint8_t decodeBCD(uint8_t value) {
+	// output = low + high * 10
+	//        = low + high * 16 - high * 6
+	//        = value           - high * 6
+	return value - (value >> 4) * 6;
+}
+
 /* Simple "smart" pointer */
 
 class Data {
diff --git a/tools/common/gamedb.py b/tools/common/gamedb.py
index ff5036a..31c079a 100644
--- a/tools/common/gamedb.py
+++ b/tools/common/gamedb.py
@@ -18,7 +18,7 @@ from collections.abc import Mapping
 from dataclasses     import dataclass
 from enum            import IntEnum, IntFlag
 from struct          import Struct
-from typing          import Any, Self
+from typing          import Any
 
 from .util import JSONGroupedObject
 
@@ -57,7 +57,7 @@ class CartPCBType(IntEnum):
 	CART_PWB0000088954          = 13
 
 	@staticmethod
-	def fromJSONObject(obj: str) -> Self:
+	def fromJSONObject(obj: str):
 		return {
 			"unknown-x76f041":        CartPCBType.CART_UNKNOWN_X76F041,
 			"unknown-x76f041-ds2401": CartPCBType.CART_UNKNOWN_X76F041_DS2401,
@@ -107,7 +107,7 @@ class HeaderFlag(IntFlag):
 	REGION_LOWERCASE      = 1 << 7
 
 	@staticmethod
-	def fromJSONObject(obj: Mapping[str, Any]) -> Self:
+	def fromJSONObject(obj: Mapping[str, Any]):
 		flags: HeaderFlag = HeaderFlag(0)
 
 		flags |= {
@@ -167,7 +167,7 @@ class ChecksumFlag(IntFlag):
 	CHECKSUM_FORCE_GX_SPEC     = 1 << 5
 
 	@staticmethod
-	def fromJSONObject(obj: Mapping[str, Any]) -> Self:
+	def fromJSONObject(obj: Mapping[str, Any]):
 		flags: ChecksumFlag = ChecksumFlag(0)
 
 		flags |= {
@@ -221,7 +221,7 @@ class IdentifierFlag(IntFlag):
 	PUBLIC_XID_PRESENT           = 1 << 7
 
 	@staticmethod
-	def fromJSONObject(obj: Mapping[str, Any]) -> Self:
+	def fromJSONObject(obj: Mapping[str, Any]):
 		flags: IdentifierFlag = IdentifierFlag(0)
 
 		flags |= {
@@ -274,7 +274,7 @@ class SignatureFlag(IntFlag):
 	SIGNATURE_PAD_WITH_FF   = 1 << 2
 
 	@staticmethod
-	def fromJSONObject(obj: Mapping[str, Any]) -> Self:
+	def fromJSONObject(obj: Mapping[str, Any]):
 		flags: SignatureFlag = SignatureFlag(0)
 
 		flags |= {
@@ -316,7 +316,7 @@ class IOBoardType(IntEnum):
 	IO_BOARD_GUNMANIA     = 6
 
 	@staticmethod
-	def fromJSONObject(obj: str | None) -> Self:
+	def fromJSONObject(obj: str | None):
 		return {
 			None:            IOBoardType.IO_BOARD_NONE,
 			"GX700-PWB(F)":  IOBoardType.IO_BOARD_ANALOG,
@@ -347,7 +347,7 @@ class PCMCIADeviceType(IntEnum):
 	PCMCIA_FLASH_CARD_64 = 5
 
 	@staticmethod
-	def fromJSONObject(obj: str | None) -> Self:
+	def fromJSONObject(obj: str | None):
 		return {
 			None:            PCMCIADeviceType.PCMCIA_NONE,
 			"PWB0000100991": PCMCIADeviceType.PCMCIA_NETWORK_PCB,
@@ -372,7 +372,7 @@ class GameFlag(IntFlag):
 	GAME_RTC_HEADER_REQUIRED         = 1 << 1
 
 	@staticmethod
-	def fromJSONObject(obj: Mapping[str, Any]) -> Self:
+	def fromJSONObject(obj: Mapping[str, Any]):
 		flags: GameFlag = GameFlag(0)
 
 		for key, flag in {
@@ -412,7 +412,7 @@ class ROMHeaderInfo:
 	signatureFlags: SignatureFlag
 
 	@staticmethod
-	def fromJSONObject(obj: Mapping[str, Any]) -> Self:
+	def fromJSONObject(obj: Mapping[str, Any]):
 		return ROMHeaderInfo(
 			bytes.fromhex(obj.get("signatureField", "").replace("-", " ")),
 			bytes.fromhex(obj.get("yearField",      "").replace("-", " ")),
@@ -457,7 +457,7 @@ class CartInfo:
 	idFlags:       IdentifierFlag
 
 	@staticmethod
-	def fromJSONObject(obj: Mapping[str, Any]) -> Self:
+	def fromJSONObject(obj: Mapping[str, Any]):
 		return CartInfo(
 			CartPCBType.fromJSONObject(obj["pcb"]),
 
@@ -523,7 +523,7 @@ class GameInfo:
 	gameCart:    CartInfo      | None = None
 
 	@staticmethod
-	def fromJSONObject(obj: Mapping[str, Any]) -> Self:
+	def fromJSONObject(obj: Mapping[str, Any]):
 		rtcHeader:   Mapping[str, Any] | None = obj.get("rtcHeader",   None)
 		flashHeader: Mapping[str, Any] | None = obj.get("flashHeader", None)
 		installCart: Mapping[str, Any] | None = obj.get("installCart", None)