mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-10 21:05:12 +01:00
[Core/SG] improved SG-1000 cartridge memory mapping (fixes Safari Hunting crash when accessing unmapped ROM area)
This commit is contained in:
EkeEke
parent
515e2ff0d1
commit
46f3e640e8
@ -43,8 +43,9 @@
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#define MAPPER_NONE (0x00)
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#define MAPPER_TEREBI (0x01)
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#define MAPPER_RAM_2K (0x02)
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#define MAPPER_RAM_8K_EXT1 (0x03)
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#define MAPPER_RAM_8K_EXT2 (0x04)
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#define MAPPER_RAM_8K (0x03)
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#define MAPPER_RAM_8K_EXT1 (0x04)
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#define MAPPER_RAM_8K_EXT2 (0x05)
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#define MAPPER_SEGA (0x10)
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#define MAPPER_SEGA_X (0x11)
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#define MAPPER_93C46 (0x12)
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@ -146,11 +147,13 @@ static const rominfo_t game_list[] =
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{0xDD4A661B, 0, 0, 0, MAPPER_TEREBI, SYSTEM_SG, REGION_JAPAN_NTSC}, /* Terebi Oekaki */
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/* games using 2KB external RAM (volatile) */
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{0x092F29D6, 0, 0, 0, MAPPER_RAM_2K, SYSTEM_SG, REGION_JAPAN_NTSC}, /* The Castle (J) */
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{0xAF4F14BC, 0, 0, 0, MAPPER_RAM_2K, SYSTEM_SG, REGION_JAPAN_NTSC}, /* Othello (J) */
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{0x1D1A0CA3, 0, 0, 0, MAPPER_RAM_2K, SYSTEM_SGII, REGION_JAPAN_NTSC}, /* Othello (TW) */
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/* games requiring SG-1000 II 8K RAM extension adapter */
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/* games using 8KB external RAM (volatile) */
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{0x092F29D6, 0, 0, 0, MAPPER_RAM_8K, SYSTEM_SG, REGION_JAPAN_NTSC}, /* The Castle (J) */
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/* games requiring SG-1000 II 8K RAM extension adapters */
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{0xCE5648C3, 0, 0, 0, MAPPER_RAM_8K_EXT1, SYSTEM_SGII, REGION_JAPAN_NTSC}, /* Bomberman Special [DahJee] (TW) */
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{0x223397A1, 0, 0, 0, MAPPER_RAM_8K_EXT1, SYSTEM_SGII, REGION_JAPAN_NTSC}, /* King's Valley (TW) */
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{0x281D2888, 0, 0, 0, MAPPER_RAM_8K_EXT1, SYSTEM_SGII, REGION_JAPAN_NTSC}, /* Knightmare (TW) */
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@ -464,22 +467,22 @@ void sms_cart_init(void)
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/* ROM paging */
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if (cart_rom.mapper < MAPPER_SEGA)
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{
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/* 1k ROM banks */
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/* 1KB ROM banks */
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cart_rom.pages = (cart.romsize + (1 << 10) - 1) >> 10;
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}
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else if (cart_rom.mapper & MAPPER_KOREA_8K)
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{
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/* 8k ROM banks */
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/* 8KB ROM banks */
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cart_rom.pages = (cart.romsize + (1 << 13) - 1) >> 13;
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}
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else if (cart_rom.mapper & MAPPER_MULTI_32K)
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{
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/* 32k ROM banks */
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/* 32KB ROM banks */
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cart_rom.pages = (cart.romsize + (1 << 15) - 1) >> 15;
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}
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else
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{
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/* 16k ROM banks */
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/* 16KB ROM banks */
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cart_rom.pages = (cart.romsize + (1 << 14) - 1) >> 14;
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}
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@ -519,7 +522,7 @@ void sms_cart_init(void)
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if (bios_size > 0xC000)
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{
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/* assume SEGA mapper if BIOS ROM is larger than 48k */
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/* assume SEGA mapper if BIOS ROM is larger than 48KB */
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bios_rom.mapper = MAPPER_SEGA;
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bios_rom.pages = bios_size >> 14;
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}
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@ -582,7 +585,7 @@ void sms_cart_reset(void)
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break;
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}
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/* check if BIOS is larger than 1k */
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/* check if BIOS is larger than 1KB */
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if (bios_rom.pages > 1)
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{
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/* enable BIOS ROM */
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@ -612,7 +615,7 @@ void sms_cart_reset(void)
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/* reset Z80 memory map */
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mapper_reset();
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/* 1k BIOS special case (Majesco GG) */
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/* 1KB BIOS special case (Majesco GG) */
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if (bios_rom.pages == 1)
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{
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/* BIOS ROM is mapped to $0000-$03FF */
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@ -643,7 +646,7 @@ void sms_cart_switch(uint8 mode)
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/* BIOS ROM enabled ? */
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if (mode & 0x08)
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{
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/* check if BIOS ROM is larger than 1K */
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/* check if BIOS ROM is larger than 1KB */
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if (bios_rom.pages > 1)
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{
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/* map BIOS ROM */
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@ -683,7 +686,7 @@ void sms_cart_switch(uint8 mode)
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/* reset Z80 memory map */
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mapper_reset();
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/* 1k BIOS special case (Majesco GG) */
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/* 1KB BIOS special case (Majesco GG) */
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if ((bios_rom.pages == 1) && ((mode & 0x48) == 0x08))
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{
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/* BIOS ROM is mapped to $0000-$03FF */
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@ -746,10 +749,10 @@ static void mapper_reset(void)
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/* reset $C000-$FFFF mapping */
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if (cart_rom.mapper == MAPPER_RAM_8K_EXT2)
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{
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/* 8k RAM extension adapter (type B) */
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/* 8KB RAM extension adapter (type B) */
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for (i = 0x30; i < 0x40; i++)
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{
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/* $C000-$FFFF mapped to 8k external RAM (mirrored) */
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/* $C000-$FFFF mapped to 8KB external RAM (mirrored) */
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z80_readmap[i] = z80_writemap[i] = &work_ram[(i & 0x07) << 10];
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}
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}
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@ -758,7 +761,7 @@ static void mapper_reset(void)
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/* SG-1000 II clone hardware with 2KB internal RAM */
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for (i = 0x30; i < 0x40; i++)
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{
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/* $C000-$FFFF mapped to 2k internal RAM (mirrored) */
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/* $C000-$FFFF mapped to 2KB internal RAM (mirrored) */
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z80_readmap[i] = z80_writemap[i] = &work_ram[(i & 0x01) << 10];
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}
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}
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@ -767,7 +770,7 @@ static void mapper_reset(void)
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/* default SG-1000 hardware has only 1KB internal RAM */
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for (i = 0x30; i < 0x40; i++)
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{
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/* $C000-$FFFF mapped to 1k internal RAM (mirrored) */
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/* $C000-$FFFF mapped to 1KB internal RAM (mirrored) */
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z80_readmap[i] = z80_writemap[i] = &work_ram[0];
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}
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}
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@ -776,7 +779,7 @@ static void mapper_reset(void)
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/* Mark III / Master System / Game Gear hardware */
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for (i = 0x30; i < 0x40; i++)
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{
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/* $C000-$FFFF mapped to 8k internal RAM (mirrored) */
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/* $C000-$FFFF mapped to 8KB internal RAM (mirrored) */
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z80_readmap[i] = z80_writemap[i] = &work_ram[(i & 0x07) << 10];
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}
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}
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@ -797,39 +800,81 @@ static void mapper_reset(void)
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return;
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}
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/* reset $0000-$BFFF mapping */
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for (i = 0x00; i < 0x30; i++)
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{
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/* by default, $0000-$BFFF is mapped to cartridge ROM (first 48k) */
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z80_readmap[i] = &slot.rom[i << 10];
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z80_writemap[i] = cart.rom + 0x510000; /* unused area */
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}
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/* reset cartridge hardware mapping */
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if (slot.mapper == MAPPER_RAM_8K_EXT1)
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if (slot.mapper < MAPPER_SEGA)
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{
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/* 8k RAM extension adapter (type A) */
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for (i = 0x08; i < 0x10; i++)
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/* $0000-$7FFF mapping */
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for (i = 0x00; i < 0x20; i++)
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{
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/* $2000-$3FFF mapped to 8k external RAM */
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z80_readmap[i] = z80_writemap[i] = &work_ram[0x2000 + ((i & 0x07) << 10)];
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/* by default, $0000-$7FFF mapped to cartridge ROM lower KB (mirrored if less than 32KB) */
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z80_readmap[i] = &slot.rom[(i % slot.pages) << 10];
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z80_writemap[i] = cart.rom + 0x510000; /* unused area */
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}
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/* 8KB RAM extension adapter (type A) */
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if (slot.mapper == MAPPER_RAM_8K_EXT1)
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{
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for (i = 0x08; i < 0x10; i++)
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{
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/* $2000-$3FFF mapped to 8KB external RAM */
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z80_readmap[i] = z80_writemap[i] = &work_ram[0x2000 + ((i & 0x07) << 10)];
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}
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}
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/* $8000-$BFFF mapping */
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if (slot.mapper == MAPPER_RAM_8K)
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{
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/* 8KB on-board RAM (The Castle) */
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for (i = 0x20; i < 0x30; i++)
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{
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/* $8000-$BFFF mapped to 8KB external RAM (mirrored) */
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z80_readmap[i] = z80_writemap[i] = &work_ram[0x2000 + ((i & 0x07) << 10)];
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}
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}
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else if (slot.mapper == MAPPER_RAM_2K)
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{
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/* 2KB on-board RAM (Othello) */
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for (i = 0x20; i < 0x30; i++)
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{
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/* $8000-$BFFF mapped to 2KB external RAM (mirrored) */
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z80_readmap[i] = z80_writemap[i] = &work_ram[0x2000 + ((i & 0x01) << 10)];
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}
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}
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else if (slot.pages <= 0x20)
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{
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/* cartridge ROM lower than 32KB */
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for (i = 0x20; i < 0x30; i++)
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{
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/* $8000-$BFFF mapped to unused area */
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z80_writemap[i] = cart.rom + 0x510000;
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z80_readmap[i] = cart.rom + 0x510400;
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}
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}
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else
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{
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/* cartridge ROM up to 48KB */
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for (i = 0x20; i < 0x30; i++)
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{
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/* $8000-$BFFF mapped to cartridge ROM upper KB (mirrored if less than 48KB) */
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z80_readmap[i] = &slot.rom[(0x20 + (i % (slot.pages - 0x20))) << 10];
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z80_writemap[i] = cart.rom + 0x510000; /* unused area */
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}
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}
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}
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else if (slot.mapper == MAPPER_RAM_2K)
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else
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{
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/* 2k on-board RAM (The Castle, Othello) */
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for (i = 0x20; i < 0x30; i++)
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/* reset $0000-$BFFF mapping */
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for (i = 0x00; i < 0x30; i++)
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{
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/* $8000-$BFFF mapped to 2k external RAM (mirrored) */
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z80_readmap[i] = z80_writemap[i] = &work_ram[0x2000 + ((i & 0x07) << 10)];
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/* by default, $0000-$BFFF is mapped to cartridge ROM lower 48KB */
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z80_readmap[i] = &slot.rom[i << 10];
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z80_writemap[i] = cart.rom + 0x510000; /* unused area */
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}
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}
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else if (slot.mapper >= MAPPER_SEGA)
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{
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/* reset ROM paging hardware */
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if (slot.mapper & MAPPER_KOREA_8K)
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{
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/* 8k pages */
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/* 8KB pages */
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mapper_8k_w(0,slot.fcr[0]);
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mapper_8k_w(1,slot.fcr[1]);
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mapper_8k_w(2,slot.fcr[2]);
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@ -838,7 +883,7 @@ static void mapper_reset(void)
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/* "Nemesis" mapper specific */
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if (slot.mapper == MAPPER_MSX_NEMESIS)
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{
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/* first 8k page is mapped to last 8k ROM bank */
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/* first 8KB page is mapped to last 8KB ROM bank */
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for (i = 0x00; i < 0x08; i++)
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{
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z80_readmap[i] = &slot.rom[(0x0f << 13) | ((i & 0x07) << 10)];
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@ -847,12 +892,12 @@ static void mapper_reset(void)
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}
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else if (slot.mapper & MAPPER_MULTI_32K)
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{
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/* 32k pages */
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/* 32KB pages */
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mapper_32k_w(slot.fcr[0]);
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}
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else
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{
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/* 16k pages */
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/* 16KB pages */
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mapper_16k_w(0,slot.fcr[0]);
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mapper_16k_w(1,slot.fcr[1]);
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mapper_16k_w(2,slot.fcr[2]);
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@ -863,12 +908,10 @@ static void mapper_reset(void)
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/* reset Z80 memory handlers */
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switch (slot.mapper)
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{
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case MAPPER_NONE:
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case MAPPER_RAM_2K:
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case MAPPER_RAM_8K_EXT1:
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case MAPPER_RAM_8K_EXT2:
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case MAPPER_SEGA:
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case MAPPER_SEGA_X:
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z80_readmem = read_mapper_default;
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z80_writemem = write_mapper_none;
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z80_writemem = write_mapper_sega;
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break;
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case MAPPER_CODIES:
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@ -919,7 +962,7 @@ static void mapper_reset(void)
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default:
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z80_readmem = read_mapper_default;
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z80_writemem = write_mapper_sega;
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z80_writemem = write_mapper_none;
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break;
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}
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}
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@ -928,16 +971,16 @@ static void mapper_8k_w(int offset, unsigned char data)
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{
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int i;
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/* cartridge ROM page (8k) */
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/* cartridge ROM page (8KB) */
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uint8 *page = &slot.rom[(data % slot.pages) << 13];
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/* Save frame control register data */
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slot.fcr[offset] = data;
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/* 4 x 8k banks */
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/* 4 x 8KB banks */
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switch (offset & 3)
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{
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case 0: /* cartridge ROM bank (8k) at $8000-$9FFF */
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case 0: /* cartridge ROM bank (8KB) at $8000-$9FFF */
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{
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for (i = 0x20; i < 0x28; i++)
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{
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@ -946,7 +989,7 @@ static void mapper_8k_w(int offset, unsigned char data)
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break;
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}
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case 1: /* cartridge ROM bank (8k) at $A000-$BFFF */
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case 1: /* cartridge ROM bank (8KB) at $A000-$BFFF */
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{
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for (i = 0x28; i < 0x30; i++)
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{
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@ -955,7 +998,7 @@ static void mapper_8k_w(int offset, unsigned char data)
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break;
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}
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case 2: /* cartridge ROM bank (8k) at $4000-$5FFF */
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case 2: /* cartridge ROM bank (8KB) at $4000-$5FFF */
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{
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for (i = 0x10; i < 0x18; i++)
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{
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@ -964,7 +1007,7 @@ static void mapper_8k_w(int offset, unsigned char data)
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break;
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}
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case 3: /* cartridge ROM bank (8k) at $6000-$7FFF */
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case 3: /* cartridge ROM bank (8KB) at $6000-$7FFF */
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{
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for (i = 0x18; i < 0x20; i++)
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{
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@ -984,7 +1027,7 @@ static void mapper_16k_w(int offset, unsigned char data)
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{
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int i;
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/* cartridge ROM page (16k) */
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/* cartridge ROM page (16KB) */
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uint8 page = data % slot.pages;
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/* page index increment (SEGA mapper only) */
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@ -1002,7 +1045,7 @@ static void mapper_16k_w(int offset, unsigned char data)
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{
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if (data & 0x08)
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{
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/* external RAM (upper or lower 16K) mapped at $8000-$BFFF */
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/* external RAM (upper or lower 16KB) mapped at $8000-$BFFF */
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for (i = 0x20; i < 0x30; i++)
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{
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z80_readmap[i] = z80_writemap[i] = &sram.sram[((data & 0x04) << 12) + ((i & 0x0F) << 10)];
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@ -1010,7 +1053,7 @@ static void mapper_16k_w(int offset, unsigned char data)
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}
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else
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{
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/* cartridge ROM page (16k) */
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/* cartridge ROM page (16KB) */
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page = slot.fcr[3] % slot.pages;
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/* page index increment (SEGA mapper) */
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@ -1029,7 +1072,7 @@ static void mapper_16k_w(int offset, unsigned char data)
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if (data & 0x10)
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{
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/* external RAM (lower 16K) mapped at $C000-$FFFF */
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/* external RAM (lower 16KB) mapped at $C000-$FFFF */
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for (i = 0x30; i < 0x40; i++)
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{
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z80_readmap[i] = z80_writemap[i] = &sram.sram[(i & 0x0F) << 10];
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@ -1037,7 +1080,7 @@ static void mapper_16k_w(int offset, unsigned char data)
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}
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else
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{
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/* internal RAM (8K mirrorred) mapped at $C000-$FFFF */
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/* internal RAM (8KB mirrored) mapped at $C000-$FFFF */
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for (i = 0x30; i < 0x40; i++)
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{
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z80_readmap[i] = z80_writemap[i] = &work_ram[(i & 0x07) << 10];
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@ -1046,9 +1089,9 @@ static void mapper_16k_w(int offset, unsigned char data)
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break;
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}
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case 1: /* cartridge ROM bank (16k) at $0000-$3FFF */
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case 1: /* cartridge ROM bank (16KB) at $0000-$3FFF */
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{
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/* first 1k is not fixed (CODEMASTER or MULTI mappers only) */
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/* first 1KB is not fixed (CODEMASTER or MULTI mappers only) */
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if ((slot.mapper == MAPPER_CODIES) || (slot.mapper == MAPPER_MULTI_16K))
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{
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z80_readmap[0] = &slot.rom[(page << 14)];
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@ -1061,7 +1104,7 @@ static void mapper_16k_w(int offset, unsigned char data)
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break;
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}
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case 2: /* cartridge ROM bank (16k) at $4000-$7FFF */
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case 2: /* cartridge ROM bank (16KB) at $4000-$7FFF */
|
||||
{
|
||||
for (i = 0x10; i < 0x20; i++)
|
||||
{
|
||||
@ -1073,7 +1116,7 @@ static void mapper_16k_w(int offset, unsigned char data)
|
||||
{
|
||||
if (data & 0x80)
|
||||
{
|
||||
/* external RAM (8k) mapped at $A000-$BFFF */
|
||||
/* external RAM (8KB) mapped at $A000-$BFFF */
|
||||
for (i = 0x28; i < 0x30; i++)
|
||||
{
|
||||
z80_readmap[i] = z80_writemap[i] = &sram.sram[(i & 0x0F) << 10];
|
||||
@ -1081,7 +1124,7 @@ static void mapper_16k_w(int offset, unsigned char data)
|
||||
}
|
||||
else
|
||||
{
|
||||
/* cartridge ROM page (16k) */
|
||||
/* cartridge ROM page (16KB) */
|
||||
page = slot.fcr[3] % slot.pages;
|
||||
|
||||
/* cartridge ROM mapped at $A000-$BFFF */
|
||||
@ -1095,21 +1138,21 @@ static void mapper_16k_w(int offset, unsigned char data)
|
||||
break;
|
||||
}
|
||||
|
||||
case 3: /* cartridge ROM bank (16k) at $8000-$BFFF */
|
||||
case 3: /* cartridge ROM bank (16KB) at $8000-$BFFF */
|
||||
{
|
||||
/* check that external RAM (16k) is not mapped at $8000-$BFFF (SEGA mapper only) */
|
||||
/* check that external RAM (16KB) is not mapped at $8000-$BFFF (SEGA mapper only) */
|
||||
if ((slot.fcr[0] & 0x08)) break;
|
||||
|
||||
/* first 8k */
|
||||
/* first 8KB */
|
||||
for (i = 0x20; i < 0x28; i++)
|
||||
{
|
||||
z80_readmap[i] = &slot.rom[(page << 14) | ((i & 0x0F) << 10)];
|
||||
}
|
||||
|
||||
/* check that cartridge RAM (8k) is not mapped at $A000-$BFFF (CODEMASTER mapper only) */
|
||||
/* check that cartridge RAM (8KB) is not mapped at $A000-$BFFF (CODEMASTER mapper only) */
|
||||
if ((slot.mapper == MAPPER_CODIES) && (slot.fcr[2] & 0x80)) break;
|
||||
|
||||
/* last 8k */
|
||||
/* last 8KB */
|
||||
for (i = 0x28; i < 0x30; i++)
|
||||
{
|
||||
z80_readmap[i] = &slot.rom[(page << 14) | ((i & 0x0F) << 10)];
|
||||
@ -1128,19 +1171,19 @@ static void mapper_32k_w(unsigned char data)
|
||||
{
|
||||
int i;
|
||||
|
||||
/* cartridge ROM page (32k) */
|
||||
/* cartridge ROM page (32KB) */
|
||||
uint8 *page = &slot.rom[(data % slot.pages) << 15];
|
||||
|
||||
/* Save frame control register data */
|
||||
slot.fcr[0] = data;
|
||||
|
||||
/* selected page (32k) is mapped at $0000-$7FFF */
|
||||
/* selected page (32KB) is mapped at $0000-$7FFF */
|
||||
for (i = 0x00; i < 0x20; i++)
|
||||
{
|
||||
z80_readmap[i] = &page[i << 10];
|
||||
}
|
||||
|
||||
/* first 16K is mirrored at $8000-$BFFF */
|
||||
/* first 16KB is mirrored at $8000-$BFFF */
|
||||
for (i = 0x20; i < 0x30; i++)
|
||||
{
|
||||
z80_readmap[i] = z80_readmap[i & 0x0F];
|
||||
@ -1379,10 +1422,10 @@ static unsigned char read_mapper_korea_8k(unsigned int address)
|
||||
{
|
||||
unsigned char data = z80_readmap[address >> 10][address & 0x03FF];
|
||||
|
||||
/* 16k page */
|
||||
/* 16KB page */
|
||||
unsigned char page = address >> 14;
|
||||
|
||||
/* $4000-$7FFFF and $8000-$BFFF area are protected */
|
||||
/* $4000-$7FFF and $8000-$BFFF area are protected */
|
||||
if (((page == 1) && (slot.fcr[2] & 0x80)) || ((page == 2) && (slot.fcr[0] & 0x80)))
|
||||
{
|
||||
/* bit-swapped value */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user