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GB MBC: Add NT (new) support (closes #2435)

This commit is contained in:
Vicki Pfau 2022-02-06 21:43:53 -08:00
parent 31201d4903
commit d33471e117
7 changed files with 77 additions and 27 deletions
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1
CHANGES
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@ -13,6 +13,7 @@ Features:
- Additional scaling shaders
- Support for GameShark Advance SP (.gsv) save file importing
- Support for multiple saves per game using .sa2, .sa3, etc.
- New unlicensed GB mappers: NT (newer type)
Emulation fixes:
- ARM7: Fix unsigned multiply timing
- GB Memory: Add cursory cartridge open bus emulation (fixes mgba.io/i/2032)

1
include/mgba/gb/interface.h
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@ -41,6 +41,7 @@ enum GBMemoryBankControllerType {
GB_MBC5_RUMBLE = 0x105,
GB_UNL_WISDOM_TREE = 0x200,
GB_UNL_PKJD = 0x203,
GB_UNL_NT_NEW = 0x212,
GB_UNL_BBD = 0x220, // Also used as a mask for MBCs that need special read behavior
GB_UNL_HITEK = 0x221,
};

14
include/mgba/internal/gb/memory.h
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@ -145,11 +145,7 @@ struct GBMBC1State {
};
struct GBMBC6State {
int currentBank1;
uint8_t* romBank1;
bool sramAccess;
int currentSramBank1;
uint8_t* sramBank1;
bool flashBank0;
bool flashBank1;
};
@ -191,6 +187,10 @@ struct GBPKJDState {
uint8_t reg[2];
};
struct GBNTNewState {
bool splitMode;
};
struct GBBBDState {
int dataSwapMode;
int bankSwapMode;
@ -204,6 +204,7 @@ union GBMBCState {
struct GBPocketCamState pocketCam;
struct GBTAMA5State tama5;
struct GBHuC3State huc3;
struct GBNTNewState ntNew;
struct GBPKJDState pkjd;
struct GBBBDState bbd;
};
@ -219,6 +220,11 @@ struct GBMemory {
union GBMBCState mbcState;
int currentBank;
int currentBank0;
int currentBank1;
uint8_t* romBank1;
int currentSramBank1;
uint8_t* sramBank1;
unsigned cartBusDecay;
uint16_t cartBusPc;
uint8_t cartBus;

56
src/gb/mbc.c
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@ -38,6 +38,7 @@ static void _GBPocketCam(struct GB* gb, uint16_t address, uint8_t value);
static void _GBTAMA5(struct GB* gb, uint16_t address, uint8_t value);
static void _GBWisdomTree(struct GB* gb, uint16_t address, uint8_t value);
static void _GBPKJD(struct GB* gb, uint16_t address, uint8_t value);
static void _GBNTNew(struct GB* gb, uint16_t address, uint8_t value);
static void _GBBBD(struct GB* gb, uint16_t address, uint8_t value);
static void _GBHitek(struct GB* gb, uint16_t address, uint8_t value);
@ -86,7 +87,10 @@ void GBMBCSwitchBank0(struct GB* gb, int bank) {
void GBMBCSwitchHalfBank(struct GB* gb, int half, int bank) {
size_t bankStart = bank * GB_SIZE_CART_HALFBANK;
bool isFlash = half ? gb->memory.mbcState.mbc6.flashBank1 : gb->memory.mbcState.mbc6.flashBank0;
bool isFlash = false;
if (gb->memory.mbcType == GB_MBC6) {
isFlash = half ? gb->memory.mbcState.mbc6.flashBank1 : gb->memory.mbcState.mbc6.flashBank0;
}
if (isFlash) {
if (bankStart + GB_SIZE_CART_HALFBANK > GB_SIZE_MBC6_FLASH) {
mLOG(GB_MBC, GAME_ERROR, "Attempting to switch to an invalid Flash bank: %0X", bank);
@ -113,11 +117,11 @@ void GBMBCSwitchHalfBank(struct GB* gb, int half, int bank) {
gb->memory.currentBank = bank;
} else {
if (isFlash) {
gb->memory.mbcState.mbc6.romBank1 = &gb->memory.sram[bankStart];
gb->memory.romBank1 = &gb->memory.sram[bankStart];
} else {
gb->memory.mbcState.mbc6.romBank1 = &gb->memory.rom[bankStart];
gb->memory.romBank1 = &gb->memory.rom[bankStart];
}
gb->memory.mbcState.mbc6.currentBank1 = bank;
gb->memory.currentBank1 = bank;
}
if (gb->cpu->pc < GB_BASE_VRAM) {
gb->cpu->memory.setActiveRegion(gb->cpu, gb->cpu->pc);
@ -220,8 +224,8 @@ void GBMBCSwitchSramHalfBank(struct GB* gb, int half, int bank) {
gb->memory.sramBank = &gb->memory.sram[bankStart];
gb->memory.sramCurrentBank = bank;
} else {
gb->memory.mbcState.mbc6.sramBank1 = &gb->memory.sram[bankStart];
gb->memory.mbcState.mbc6.currentSramBank1 = bank;
gb->memory.sramBank1 = &gb->memory.sram[bankStart];
gb->memory.currentSramBank1 = bank;
}
}
@ -403,6 +407,13 @@ void GBMBCInit(struct GB* gb) {
case GB_UNL_WISDOM_TREE:
gb->memory.mbcWrite = _GBWisdomTree;
break;
case GB_UNL_NT_NEW:
gb->memory.mbcWrite = _GBNTNew;
break;
case GB_UNL_PKJD:
gb->memory.mbcWrite = _GBPKJD;
gb->memory.mbcRead = _GBPKJDRead;
break;
case GB_UNL_BBD:
gb->memory.mbcWrite = _GBBBD;
gb->memory.mbcRead = _GBBBDRead;
@ -413,10 +424,6 @@ void GBMBCInit(struct GB* gb) {
gb->memory.mbcState.bbd.dataSwapMode = 7;
gb->memory.mbcState.bbd.bankSwapMode = 7;
break;
case GB_UNL_PKJD:
gb->memory.mbcWrite = _GBPKJD;
gb->memory.mbcRead = _GBPKJDRead;
break;
}
gb->memory.currentBank = 1;
@ -790,7 +797,7 @@ void _GBMBC6(struct GB* gb, uint16_t address, uint8_t value) {
case 0x2E:
case 0x2F:
if (memory->sramAccess) {
memory->mbcState.mbc6.sramBank1[address & (GB_SIZE_EXTERNAL_RAM_HALFBANK - 1)] = value;
memory->sramBank1[address & (GB_SIZE_EXTERNAL_RAM_HALFBANK - 1)] = value;
}
break;
default:
@ -807,7 +814,7 @@ uint8_t _GBMBC6Read(struct GBMemory* memory, uint16_t address) {
case 0xA:
return memory->sramBank[address & (GB_SIZE_EXTERNAL_RAM_HALFBANK - 1)];
case 0xB:
return memory->mbcState.mbc6.sramBank1[address & (GB_SIZE_EXTERNAL_RAM_HALFBANK - 1)];
return memory->sramBank1[address & (GB_SIZE_EXTERNAL_RAM_HALFBANK - 1)];
}
return 0xFF;
}
@ -818,7 +825,7 @@ static void _GBMBC6MapChip(struct GB* gb, int half, uint8_t value) {
GBMBCSwitchHalfBank(gb, half, gb->memory.currentBank);
} else {
gb->memory.mbcState.mbc6.flashBank1 = !!(value & 0x08);
GBMBCSwitchHalfBank(gb, half, gb->memory.mbcState.mbc6.currentBank1);
GBMBCSwitchHalfBank(gb, half, gb->memory.currentBank1);
}
}
@ -1577,6 +1584,29 @@ static uint8_t _GBPKJDRead(struct GBMemory* memory, uint16_t address) {
}
}
void _GBNTNew(struct GB* gb, uint16_t address, uint8_t value) {
struct GBMemory* memory = &gb->memory;
if (address >> 8 == 0x14) {
memory->mbcState.ntNew.splitMode = true;
return;
}
if (memory->mbcState.ntNew.splitMode) {
int bank = value;
if (bank < 2) {
bank = 2;
}
switch (address >> 10) {
case 8:
GBMBCSwitchHalfBank(gb, 0, bank);
return;
case 9:
GBMBCSwitchHalfBank(gb, 1, bank);
return;
}
}
_GBMBC5(gb, address, value);
}
static uint8_t _reorderBits(uint8_t input, const uint8_t* reorder) {
uint8_t newbyte = 0;
int i;

8
src/gb/memory.c
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@ -95,14 +95,14 @@ static void GBSetActiveRegion(struct SM83Core* cpu, uint16_t address) {
break;
}
cpu->memory.cpuLoad8 = GBCartLoad8;
if (gb->memory.mbcType != GB_MBC6) {
if (gb->memory.mbcType != GB_MBC6 && !(gb->memory.mbcType == GB_UNL_NT_NEW && gb->memory.mbcState.ntNew.splitMode)) {
cpu->memory.activeRegion = memory->romBank;
cpu->memory.activeRegionEnd = GB_BASE_VRAM;
cpu->memory.activeMask = GB_SIZE_CART_BANK0 - 1;
} else {
cpu->memory.activeMask = GB_SIZE_CART_HALFBANK - 1;
if (address & 0x2000) {
cpu->memory.activeRegion = memory->mbcState.mbc6.romBank1;
cpu->memory.activeRegion = memory->romBank1;
cpu->memory.activeRegionEnd = GB_BASE_VRAM;
} else {
cpu->memory.activeRegion = memory->romBank;
@ -252,8 +252,8 @@ uint8_t GBLoad8(struct SM83Core* cpu, uint16_t address) {
return memory->cartBus;
case GB_REGION_CART_BANK1 + 2:
case GB_REGION_CART_BANK1 + 3:
if (memory->mbcType == GB_MBC6) {
memory->cartBus = memory->mbcState.mbc6.romBank1[address & (GB_SIZE_CART_HALFBANK - 1)];
if (gb->memory.mbcType == GB_MBC6 || (gb->memory.mbcType == GB_UNL_NT_NEW && gb->memory.mbcState.ntNew.splitMode)) {
memory->cartBus = memory->romBank1[address & (GB_SIZE_CART_HALFBANK - 1)];
memory->cartBusPc = cpu->pc;
return memory->cartBus;
}

20
src/gb/overrides.c
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@ -668,11 +668,21 @@ static const struct GBCartridgeOverride _sgbOverrides[] = {
static const struct GBCartridgeOverride _overrides[] = {
// Pokemon Spaceworld 1997 demo
{ 0x232a067d, GB_MODEL_AUTODETECT, GB_MBC3_RTC, { 0 } }, // Gold (debug)
{ 0x630ed957, GB_MODEL_AUTODETECT, GB_MBC3_RTC, { 0 } }, // Gold (non-debug)
{ 0x5aff0038, GB_MODEL_AUTODETECT, GB_MBC3_RTC, { 0 } }, // Silver (debug)
{ 0xa61856bd, GB_MODEL_AUTODETECT, GB_MBC3_RTC, { 0 } }, // Silver (non-debug)
{ 0x30f8f86c, GB_MODEL_AUTODETECT, GB_UNL_PKJD, { 0 } }, // Pokemon Jade Version (Telefang Speed bootleg)
{ 0x232A067D, GB_MODEL_AUTODETECT, GB_MBC3_RTC, { 0 } }, // Gold (debug)
{ 0x630ED957, GB_MODEL_AUTODETECT, GB_MBC3_RTC, { 0 } }, // Gold (non-debug)
{ 0x5AFF0038, GB_MODEL_AUTODETECT, GB_MBC3_RTC, { 0 } }, // Silver (debug)
{ 0xA61856BD, GB_MODEL_AUTODETECT, GB_MBC3_RTC, { 0 } }, // Silver (non-debug)
{ 0x30F8F86C, GB_MODEL_AUTODETECT, GB_UNL_PKJD, { 0 } }, // Pokemon Jade Version (Telefang Speed bootleg)
{ 0xB289D95A, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // Capcom vs SNK - Millennium Fight 2001
{ 0x688D6713, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // Digimon 02 4
{ 0x8931A272, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // Digimon 2
{ 0x79083C6B, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // Digimon Pocket
{ 0x0C5047EE, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // Harry Potter 3
{ 0x8AC634B7, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // Pokemon Diamond (Special Pikachu Edition)
{ 0x8628A287, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // Pokemon Jade (Special Pikachu Edition)
{ 0xBC75D7B8, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // Pokemon - Mewtwo Strikes Back
{ 0xFF0B60CC, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // Shuma Baolong 02 4
{ 0x14A992A6, GB_MODEL_AUTODETECT, GB_UNL_NT_NEW, { 0 } }, // /Street Fighter Zero 4
{ 0, 0, 0, { 0 } }
};

4
src/platform/qt/GameBoy.cpp
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@ -34,9 +34,10 @@ static const QList<GBMemoryBankControllerType> s_mbcList{
GB_HuC1,
GB_HuC3,
GB_UNL_WISDOM_TREE,
GB_UNL_PKJD,
GB_UNL_NT_NEW,
GB_UNL_BBD,
GB_UNL_HITEK,
GB_UNL_PKJD,
};
static QMap<GBModel, QString> s_gbModelNames;
@ -87,6 +88,7 @@ QString GameBoy::mbcName(GBMemoryBankControllerType mbc) {
s_mbcNames[GB_POCKETCAM] = tr("Pocket Cam");
s_mbcNames[GB_TAMA5] = tr("TAMA5");
s_mbcNames[GB_UNL_WISDOM_TREE] = tr("Wisdom Tree");
s_mbcNames[GB_UNL_NT_NEW] = tr("NT (new)");
s_mbcNames[GB_UNL_PKJD] = tr("Pokémon Jade/Diamond");
s_mbcNames[GB_UNL_BBD] = tr("BBD");
s_mbcNames[GB_UNL_HITEK] = tr("Hitek");