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Genesis-Plus-GX/source/cart_hw/sms_cart.c
ekeeke31 8af85558d0 .fixed YM2413 context restore when changing options 
.added YM2413 context to Master System savestates
.removed support for older savestates format (1.3.x, 1.4.x), use 1.5.0 to convert old savestates to new (1.5.x) format
2011-04-30 12:56:01 +00:00

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/****************************************************************************
* Genesis Plus
* Master System cartridge hardware support
*
*
* Copyright (C) 1998-2007 Charles MacDonald (SMS Plus original code)
* Eke-Eke (2007-2011), additional code & fixes for the GCN/Wii port
*
* Most cartridge protections documented by Haze
* (http://haze.mameworld.info/)
*
* Realtec mapper documented by TascoDeluxe
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***************************************************************************/
#include "shared.h"
#define MAPPER_NONE (0)
#define MAPPER_SEGA (1)
#define MAPPER_CODIES (2)
#define MAPPER_KOREA (3)
#define MAPPER_MSX (4)
#define GAME_DATABASE_CNT (75)
typedef struct
{
uint32 crc;
uint8 glasses_3d;
uint8 peripheral;
uint8 mapper;
uint8 region;
} rominfo_t;
static struct
{
uint8 fcr[4];
uint8 mapper;
} slot;
/* SMS game database */
static const rominfo_t game_list[GAME_DATABASE_CNT] =
{
/* games requiring CODEMASTER mapper (NOTE: extended video modes don't work on Genesis VDP !) */
{0x29822980, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_EUROPE}, /* Cosmic Spacehead */
{0xA577CE46, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_EUROPE}, /* Micro Machines */
{0xF7C524F6, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_EUROPE}, /* Micro Machines [BAD DUMP] */
{0xDBE8895C, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_EUROPE}, /* Micro Machines 2 - Turbo Tournament */
{0xC1756BEE, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_EUROPE}, /* Pete Sampras Tennis */
{0x8813514B, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_EUROPE}, /* Excellent Dizzy Collection, The [Proto] */
{0xEA5C3A6F, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_USA}, /* Dinobasher - Starring Bignose the Caveman [Proto] */
{0x152F0DCC, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_USA}, /* Drop Zone" */
{0xAA140C9C, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_USA}, /* Excellent Dizzy Collection, The [SMS-GG] */
{0xB9664AE1, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_USA}, /* Fantastic Dizzy */
{0xC888222B, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_USA}, /* Fantastic Dizzy [SMS-GG] */
{0x76C5BDFB, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_USA}, /* Jang Pung 2 [SMS-GG] */
{0xD9A7F170, 0, SYSTEM_MS_GAMEPAD, MAPPER_CODIES, REGION_USA}, /* Man Overboard! */
/* games requiring KOREA mappers (NOTE: TMS9918 video modes don't work on Genesis VDP !) */
{0x17AB6883, 0, SYSTEM_MS_GAMEPAD, MAPPER_NONE, REGION_JAPAN_NTSC}, /* FA Tetris (KR) */
{0x61E8806F, 0, SYSTEM_MS_GAMEPAD, MAPPER_NONE, REGION_JAPAN_NTSC}, /* Flash Point (KR) */
{0x445525E2, 0, SYSTEM_MS_GAMEPAD, MAPPER_MSX, REGION_JAPAN_NTSC}, /* Penguin Adventure (KR) */
{0x83F0EEDE, 0, SYSTEM_MS_GAMEPAD, MAPPER_MSX, REGION_JAPAN_NTSC}, /* Street Master (KR) */
{0xA05258F5, 0, SYSTEM_MS_GAMEPAD, MAPPER_MSX, REGION_JAPAN_NTSC}, /* Won-Si-In (KR) */
{0x06965ED9, 0, SYSTEM_MS_GAMEPAD, MAPPER_MSX, REGION_JAPAN_NTSC}, /* F-1 Spirit - The way to Formula-1 (KR) */
{0x89B79E77, 0, SYSTEM_MS_GAMEPAD, MAPPER_KOREA, REGION_JAPAN_NTSC}, /* Dodgeball King (KR) */
{0x18FB98A3, 0, SYSTEM_MS_GAMEPAD, MAPPER_KOREA, REGION_JAPAN_NTSC}, /* Jang Pung 3 (KR) */
{0x97D03541, 0, SYSTEM_MS_GAMEPAD, MAPPER_KOREA, REGION_JAPAN_NTSC}, /* Sangokushi 3 (KR)"} */
{0x67C2F0FF, 0, SYSTEM_MS_GAMEPAD, MAPPER_KOREA, REGION_JAPAN_NTSC}, /* Super Boy 2 (KR) */
/* games requiring PAL timings */
{0x72420F38, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Addams Familly */
{0x2D48C1D3, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Back to the Future Part III */
{0x1CBB7BF1, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Battlemaniacs (BR) */
{0x1B10A951, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Bram Stoker's Dracula */
{0xC0E25D62, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* California Games II */
{0x45C50294, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Jogos de Verao II (BR) */
{0xC9DBF936, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Home Alone */
{0x0047B615, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Predator2 */
{0xF42E145C, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Quest for the Shaven Yak Starring Ren Hoek & Stimpy (BR) */
{0x9F951756, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* RoboCop 3 */
{0xF8176918, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Sensible Soccer */
{0x1575581D, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Shadow of the Beast */
{0x96B3F29E, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Sonic Blast (BR) */
{0x5B3B922C, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Sonic the Hedgehog 2 [V0] */
{0xD6F2BFCA, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Sonic the Hedgehog 2 [V1] */
{0xCA1D3752, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Space Harrier [50 Hz] */
{0x85CFC9C9, 0, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_EUROPE}, /* Taito Chase H.Q. */
/* games requiring 3-D Glasses */
{0x871562b0, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_JAPAN_NTSC}, /* Maze Walker */
{0x156948f9, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_JAPAN_NTSC}, /* Space Harrier 3-D (J) */
{0x6BD5C2BF, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_USA}, /* Space Harrier 3-D */
{0x8ECD201C, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_USA}, /* Blade Eagle 3-D */
{0xFBF96C81, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_USA}, /* Blade Eagle 3-D (BR) */
{0x58D5FC48, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_USA}, /* Blade Eagle 3-D [Proto] */
{0x31B8040B, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_USA}, /* Maze Hunter 3-D */
{0xABD48AD2, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_USA}, /* Poseidon Wars 3-D */
{0xA3EF13CB, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_USA}, /* Zaxxon 3-D */
{0xBBA74147, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_USA}, /* Zaxxon 3-D [Proto] */
{0xD6F43DDA, 1, SYSTEM_MS_GAMEPAD, MAPPER_SEGA, REGION_USA}, /* Out Run 3-D */
/* games requiring 3-D Glasses & Sega Light Phaser */
{0xFBE5CFBB, 1, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Missile Defense 3D */
{0xE79BB689, 1, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Missile Defense 3D [BIOS] */
/* games requiring Sega Light Phaser */
{0x861B6E79, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Assault City [Light Phaser] */
{0x5FC74D2A, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Gangster Town */
{0xE167A561, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Hang-On / Safari Hunt */
{0xC5083000, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Hang-On / Safari Hunt [BAD DUMP] */
{0x91E93385, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Hang-On / Safari Hunt [BIOS] */
{0xE8EA842C, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Marksman Shooting / Trap Shooting */
{0xE8215C2E, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Marksman Shooting / Trap Shooting / Safari Hunt */
{0x205CAAE8, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Operation Wolf (can be played with gamepad in port B)*/
{0x23283F37, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Operation Wolf [A] (can be played with gamepad in port B) */
{0xDA5A7013, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Rambo 3 */
{0x79AC8E7F, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Rescue Mission */
{0x4B051022, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Shooting Gallery */
{0xA908CFF5, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Spacegun */
{0x5359762D, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Wanted */
{0x0CA95637, 0, SYSTEM_LIGHTPHASER, MAPPER_SEGA, REGION_USA}, /* Laser Ghost */
/* games requiring Sega Paddle */
{0xF9DBB533, 0, SYSTEM_PADDLE, MAPPER_SEGA, REGION_JAPAN_NTSC}, /* Alex Kidd BMX Trial */
{0xA6FA42D0, 0, SYSTEM_PADDLE, MAPPER_SEGA, REGION_JAPAN_NTSC}, /* Galactic Protector */
{0x29BC7FAD, 0, SYSTEM_PADDLE, MAPPER_SEGA, REGION_JAPAN_NTSC}, /* Megumi Rescue */
{0x315917D4, 0, SYSTEM_PADDLE, MAPPER_SEGA, REGION_JAPAN_NTSC}, /* Woody Pop */
/* games requiring Sega Sport Pad */
{0x0CB7E21F, 0, SYSTEM_SPORTSPAD, MAPPER_SEGA, REGION_USA}, /* Great Ice Hockey */
{0xE42E4998, 0, SYSTEM_SPORTSPAD, MAPPER_SEGA, REGION_USA}, /* Sports Pad Football */
{0x41C948BF, 0, SYSTEM_SPORTSPAD, MAPPER_SEGA, REGION_USA} /* Sports Pad Soccer */
};
/* 1K trash buffer */
static uint8 dummy[0x400];
/* Function prorotypes */
static void mapper_8k_w(int offset, unsigned int data);
static void mapper_16k_w(int offset, unsigned int data);
static void write_mapper_none(unsigned int address, unsigned char data);
static void write_mapper_sega(unsigned int address, unsigned char data);
static void write_mapper_codies(unsigned int address, unsigned char data);
static void write_mapper_korea(unsigned int address, unsigned char data);
static void write_mapper_msx(unsigned int address, unsigned char data);
void sms_cart_init(void)
{
/* default mapper */
slot.mapper = MAPPER_SEGA;
/* default supported peripheral */
uint8 device = SYSTEM_MS_GAMEPAD;
cart.special = 0;
/* compute CRC */
uint32 crc = crc32(0, cart.rom, cart.romsize);
/* detect cartridge mapper */
int i;
for (i=0; i<GAME_DATABASE_CNT; i++)
{
if (crc == game_list[i].crc)
{
cart.special = game_list[i].glasses_3d;
slot.mapper = game_list[i].mapper;
device = game_list[i].peripheral;
i = GAME_DATABASE_CNT;
}
}
/* initialize Z80 write handler */
switch(slot.mapper)
{
case MAPPER_NONE:
z80_writemem = write_mapper_none;
break;
case MAPPER_CODIES:
z80_writemem = write_mapper_codies;
break;
case MAPPER_KOREA:
z80_writemem = write_mapper_korea;
break;
case MAPPER_MSX:
z80_writemem = write_mapper_msx;
break;
default:
z80_writemem = write_mapper_sega;
break;
}
/* initialize default SRAM (32K max.) */
sram_init();
/* restore previous input settings */
if (old_system[0] != -1)
{
input.system[0] = old_system[0];
}
if (old_system[1] != -1)
{
input.system[1] = old_system[1];
}
/* default gun offset */
input.x_offset = 20;
input.y_offset = 0;
/* detect if game requires specific peripheral */
if (device != SYSTEM_MS_GAMEPAD)
{
/* save port A setting */
if (old_system[0] == -1)
{
old_system[0] = input.system[0];
}
/* force port A configuration */
input.system[0] = device;
/* SpaceGun & Gangster Town use different gun offset */
if ((crc == 0x5359762D) || (crc == 0x5FC74D2A))
{
input.x_offset = 16;
}
}
}
void sms_cart_reset(void)
{
int i;
/* Unmapped memory return $FF */
memset(dummy, 0xFF, 0x400);
/* Reset Z80 memory mapping at $0000-$BFFF (first 32k of ROM mirrored) */
for(i = 0x00; i < 0x30; i++)
{
z80_readmap[i] = &cart.rom[(i & 0x1F) << 10];
z80_writemap[i] = dummy;
}
/* Reset Z80 memory mapping at $C000-$FFFF (first 8K of 68k RAM mirrored) */
for(i = 0x30; i < 0x40; i++)
{
z80_readmap[i] = z80_writemap[i] = &work_ram[(i & 0x07) << 10];
}
/* Reset cartridge paging registers */
switch(slot.mapper)
{
case MAPPER_NONE:
case MAPPER_SEGA:
{
slot.fcr[0] = 0;
slot.fcr[1] = 0;
slot.fcr[2] = 1;
slot.fcr[3] = 2;
break;
}
default:
{
slot.fcr[0] = 0;
slot.fcr[1] = 0;
slot.fcr[2] = 1;
slot.fcr[3] = 0;
break;
}
}
/* Set default memory map */
if (slot.mapper != MAPPER_MSX)
{
mapper_16k_w(0,slot.fcr[0]);
mapper_16k_w(1,slot.fcr[1]);
mapper_16k_w(2,slot.fcr[2]);
mapper_16k_w(3,slot.fcr[3]);
}
else
{
mapper_8k_w(0,slot.fcr[0]);
mapper_8k_w(1,slot.fcr[1]);
mapper_8k_w(2,slot.fcr[2]);
mapper_8k_w(3,slot.fcr[3]);
}
}
void sms_cart_switch(int enabled)
{
int i;
if (enabled)
{
/* Enable cartdige ROM at $0000-$BFFF */
for(i = 0x00; i < 0x30; i++)
{
z80_readmap[i] = &cart.rom[(i & 0x1F) << 10];
z80_writemap[i] = dummy;
}
}
else
{
/* Disable cartridge ROM at $0000-$BFFF */
for(i = 0x00; i < 0x30; i++)
{
z80_readmap[i] = z80_writemap[i] = dummy;
}
}
}
int sms_cart_region_detect(void)
{
/* compute CRC */
uint32 crc = crc32(0, cart.rom, cart.romsize);
/* detect game region */
int i;
for (i=0; i<GAME_DATABASE_CNT; i++)
{
if (crc == game_list[i].crc)
{
return game_list[i].region;
}
}
/* default region */
return REGION_USA;
}
int sms_cart_context_save(uint8 *state)
{
int bufferptr = 0;
save_param(slot.fcr, sizeof(slot.fcr));
return bufferptr;
}
int sms_cart_context_load(uint8 *state)
{
int bufferptr = 0;
load_param(slot.fcr, sizeof(slot.fcr));
/* Set default memory map */
if (slot.mapper != MAPPER_MSX)
{
mapper_16k_w(0,slot.fcr[0]);
mapper_16k_w(1,slot.fcr[1]);
mapper_16k_w(2,slot.fcr[2]);
mapper_16k_w(3,slot.fcr[3]);
}
else
{
mapper_8k_w(0,slot.fcr[0]);
mapper_8k_w(1,slot.fcr[1]);
mapper_8k_w(2,slot.fcr[2]);
mapper_8k_w(3,slot.fcr[3]);
}
return bufferptr;
}
void mapper_8k_w(int offset, unsigned int data)
{
int i;
/* cartridge ROM page (8k) */
uint8 page = data % (cart.romsize >> 13);
/* Save frame control register data */
slot.fcr[offset] = data;
/* 4 x 8k banks */
switch (offset & 3)
{
case 0: /* cartridge ROM bank (8k) at $8000-$9FFF */
{
for(i = 0x20; i < 0x28; i++)
{
z80_readmap[i] = &cart.rom[(page << 13) | ((i & 0x07) << 10)];
}
break;
}
case 1: /* cartridge ROM bank (8k) at $A000-$BFFF */
{
for(i = 0x28; i < 0x30; i++)
{
z80_readmap[i] = &cart.rom[(page << 13) | ((i & 0x07) << 10)];
}
break;
}
case 2: /* cartridge ROM bank (8k) at $4000-$5FFF */
{
for(i = 0x10; i < 0x18; i++)
{
z80_readmap[i] = &cart.rom[(page << 13) | ((i & 0x07) << 10)];
}
break;
}
case 3: /* cartridge ROM bank (8k) at $6000-$7FFF */
{
for(i = 0x18; i < 0x20; i++)
{
z80_readmap[i] = &cart.rom[(page << 13) | ((i & 0x07) << 10)];
}
break;
}
}
}
void mapper_16k_w(int offset, unsigned int data)
{
int i;
/* cartridge ROM page (16k) */
uint8 page = data % (cart.romsize >> 14);
/* page index increment (SEGA mapper) */
if (slot.fcr[0] & 0x03)
{
page = (page + ((4 - (slot.fcr[0] & 0x03)) << 3)) % (cart.romsize >> 14);
}
/* save frame control register data */
slot.fcr[offset] = data;
switch (offset)
{
case 0: /* control register (SEGA mapper) */
{
if(data & 0x08)
{
/* external RAM (upper or lower 16K) mapped at $8000-$BFFF */
for(i = 0x20; i <= 0x2F; i++)
{
z80_readmap[i] = z80_writemap[i] = &sram.sram[((data & 0x04) << 12) + ((i & 0x0F) << 10)];
}
}
else
{
/* cartridge ROM page (16k) */
page = slot.fcr[3] % (cart.romsize >> 14);
/* page index increment (SEGA mapper) */
if (data & 0x03)
{
page = (page + ((4 - (data & 0x03)) << 3)) % (cart.romsize >> 14);
}
/* cartridge ROM mapped at $8000-$BFFF */
for(i = 0x20; i < 0x30; i++)
{
z80_readmap[i] = &cart.rom[(page << 14) | ((i & 0x0F) << 10)];
z80_writemap[i] = dummy;
}
}
if(data & 0x10)
{
/* external RAM (lower 16K) mapped at $C000-$FFFF */
for(i = 0x30; i < 0x40; i++)
{
z80_readmap[i] = z80_writemap[i] = &sram.sram[(i & 0x0F) << 10];
}
}
else
{
/* internal RAM (8K mirrorred) mapped at $C000-$FFFF */
for(i = 0x30; i < 0x40; i++)
{
z80_readmap[i] = z80_writemap[i] = &work_ram[(i & 0x07) << 10];
}
}
break;
}
case 1: /* cartridge ROM bank (16k) at $0000-$3FFF */
{
/* first 1k is not fixed (CODEMASTER mapper) */
if (slot.mapper == MAPPER_CODIES)
{
z80_readmap[0] = &cart.rom[(page << 14)];
}
for(i = 0x01; i < 0x10; i++)
{
z80_readmap[i] = &cart.rom[(page << 14) | ((i & 0x0F) << 10)];
}
break;
}
case 2: /* cartridge ROM bank (16k) at $4000-$7FFF */
{
for(i = 0x10; i < 0x20; i++)
{
z80_readmap[i] = &cart.rom[(page << 14) | ((i & 0x0F) << 10)];
}
/* Ernie Elf's Golf external RAM switch */
if (slot.mapper == MAPPER_CODIES)
{
if (data & 0x80)
{
/* external RAM (8k) mapped at $A000-$BFFF */
for(i = 0x28; i < 0x30; i++)
{
z80_readmap[i] = z80_writemap[i] = &sram.sram[(i & 0x0F) << 10];
}
}
else
{
/* cartridge ROM page (16k) */
page = slot.fcr[3] % (cart.romsize >> 14);
/* cartridge ROM mapped at $A000-$BFFF */
for(i = 0x28; i < 0x30; i++)
{
z80_readmap[i] = &cart.rom[(page << 14) | ((i & 0x0F) << 10)];
z80_writemap[i] = dummy;
}
}
}
break;
}
case 3: /* cartridge ROM bank (16k) at $8000-$BFFF */
{
/* check that external RAM (16k) is not mapped at $8000-$BFFF (SEGA mapper) */
if ((slot.fcr[0] & 0x08)) break;
/* first 8k */
for(i = 0x20; i < 0x28; i++)
{
z80_readmap[i] = &cart.rom[(page << 14) | ((i & 0x0F) << 10)];
}
/* check that external RAM (8k) is not mapped at $A000-$BFFF (CODEMASTER mapper) */
if ((slot.mapper == MAPPER_CODIES) && (slot.fcr[2] & 0x80)) break;
/* last 8k */
for(i = 0x28; i < 0x30; i++)
{
z80_readmap[i] = &cart.rom[(page << 14) | ((i & 0x0F) << 10)];
}
break;
}
}
}
static void write_mapper_none(unsigned int address, unsigned char data)
{
z80_writemap[address >> 10][address & 0x03FF] = data;
}
static void write_mapper_sega(unsigned int address, unsigned char data)
{
if(address >= 0xFFFC)
{
mapper_16k_w(address & 3, data);
}
z80_writemap[address >> 10][address & 0x03FF] = data;
}
static void write_mapper_codies(unsigned int address, unsigned char data)
{
if (address == 0x0000)
{
mapper_16k_w(1,data);
return;
}
if (address == 0x4000)
{
mapper_16k_w(2,data);
return;
}
if (address == 0x8000)
{
mapper_16k_w(3,data);
return;
}
z80_writemap[address >> 10][address & 0x03FF] = data;
}
static void write_mapper_korea(unsigned int address, unsigned char data)
{
if (address == 0xA000)
{
mapper_16k_w(3,data);
return;
}
z80_writemap[address >> 10][address & 0x03FF] = data;
}
static void write_mapper_msx(unsigned int address, unsigned char data)
{
if (address <= 0x0003)
{
mapper_8k_w(address,data);
return;
}
z80_writemap[address >> 10][address & 0x03FF] = data;
}
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