forked from ekeeke/Genesis-Plus-GX
/
md_cart.c
1958 lines (1716 loc) · 63.6 KB
/
md_cart.c
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/****************************************************************************
* Genesis Plus
* Mega Drive cartridge hardware support
*
* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
*
* Many cartridge protections were initially documented by Haze
* (http://haze.mameworld.info/)
*
* Realtec mapper was documented by TascoDeluxe
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
*
* - Redistributions may not be sold, nor may they be used in a commercial
* product or activity.
*
* - Redistributions that are modified from the original source must include the
* complete source code, including the source code for all components used by a
* binary built from the modified sources. However, as a special exception, the
* source code distributed need not include anything that is normally distributed
* (in either source or binary form) with the major components (compiler, kernel,
* and so on) of the operating system on which the executable runs, unless that
* component itself accompanies the executable.
*
* - Redistributions must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************************/
#include "shared.h"
#include "eeprom_i2c.h"
#include "eeprom_spi.h"
/* Cart database entry */
typedef struct
{
uint16 chk_1; /* header checksum */
uint16 chk_2; /* real checksum */
uint8 bank_start; /* first mapped bank in $400000-$7fffff region */
uint8 bank_end; /* last mapped bank in $400000-$7fffff region */
cart_hw_t cart_hw; /* hardware description */
} md_entry_t;
/* Function prototypes */
static void mapper_sega_w(uint32 data);
static void mapper_512k_w(uint32 address, uint32 data);
static void mapper_ssf2_w(uint32 address, uint32 data);
static void mapper_sf001_w(uint32 address, uint32 data);
static void mapper_sf002_w(uint32 address, uint32 data);
static void mapper_sf004_w(uint32 address, uint32 data);
static uint32 mapper_sf004_r(uint32 address);
static void mapper_t5740_w(uint32 address, uint32 data);
static uint32 mapper_t5740_r(uint32 address);
static void mapper_flashkit_w(uint32 address, uint32 data);
static uint32 mapper_flashkit_r(uint32 address);
static uint32 mapper_smw_64_r(uint32 address);
static void mapper_smw_64_w(uint32 address, uint32 data);
static void mapper_realtec_w(uint32 address, uint32 data);
static void mapper_seganet_w(uint32 address, uint32 data);
static void mapper_32k_w(uint32 data);
static void mapper_64k_w(uint32 data);
static void mapper_64k_multi_w(uint32 address);
static uint32 mapper_radica_r(uint32 address);
static void default_time_w(uint32 address, uint32 data);
static void default_regs_w(uint32 address, uint32 data);
static uint32 default_regs_r(uint32 address);
static uint32 default_regs_r_16(uint32 address);
static uint32 custom_regs_r(uint32 address);
static void custom_regs_w(uint32 address, uint32 data);
static void custom_alt_regs_w(uint32 address, uint32 data);
static uint32 topshooter_r(uint32 address);
static void topshooter_w(uint32 address, uint32 data);
static uint32 tekken_regs_r(uint32 address);
static void tekken_regs_w(uint32 address, uint32 data);
/* Games that need extra hardware emulation:
- copy protection device
- custom ROM banking device
*/
static const md_entry_t rom_database[] =
{
/* Funny World & Balloon Boy */
{0x0000,0x06ab,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},1,0,NULL,NULL,NULL,mapper_realtec_w}},
/* Whac-a-Critter */
{0xffff,0xf863,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},1,0,NULL,NULL,NULL,mapper_realtec_w}},
/* Earth Defense */
{0xffff,0x44fb,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},1,0,NULL,NULL,NULL,mapper_realtec_w}},
/* Tom Clown */
{0x0000,0xc0cd,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},1,0,NULL,NULL,NULL,mapper_realtec_w}},
/* RADICA (Volume 1) (bad dump ?) */
{0x0000,0x2326,0x00,0x00,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},0,1,mapper_radica_r,NULL,NULL,NULL}},
/* RADICA (Volume 1) */
{0x24f4,0xfc84,0x00,0x00,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},0,0,mapper_radica_r,NULL,NULL,NULL}},
/* RADICA (Volume 2) */
{0x104f,0x32e9,0x00,0x00,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},0,0,mapper_radica_r,NULL,NULL,NULL}},
/* Tenchi wo Kurau III: Sangokushi Gaiden - Chinese Fighter */
{0x9490,0x8180,0x40,0x6f,{{0x00,0x00,0x00,0x00},{0xf0000c,0xf0000c,0xf0000c,0xf0000c},{0x400000,0x400004,0x400008,0x40000c},0,1,NULL,NULL,default_regs_r,custom_alt_regs_w}},
/* Top Fighter */
{0x4eb9,0x5d8b,0x60,0x7f,{{0x00,0x00,0x00,0x00},{0xf00007,0xf00007,0xf00007,0xffffff},{0x600001,0x600003,0x600005,0x000000},0,1,NULL,NULL,default_regs_r,custom_regs_w}},
/* Soul Edge VS Samurai Spirits */
{0x00ff,0x5d34,0x60,0x7f,{{0x00,0x00,0x00,0x00},{0xf00007,0xf00007,0xf00007,0xffffff},{0x600001,0x600003,0x600005,0x000000},0,1,NULL,NULL,default_regs_r,custom_regs_w}},
/* Mulan */
{0x0404,0x1b40,0x60,0x7f,{{0x00,0x00,0x00,0x00},{0xf00007,0xf00007,0xf00007,0xffffff},{0x600001,0x600003,0x600005,0x000000},0,1,NULL,NULL,default_regs_r,custom_regs_w}},
/* Pocket Monsters II */
{0x47f9,0x17e5,0x60,0x7f,{{0x00,0x00,0x00,0x00},{0xf00007,0xf00007,0xf00007,0xffffff},{0x600001,0x600003,0x600005,0x000000},0,1,NULL,NULL,default_regs_r,custom_regs_w}},
/* Lion King 3 */
{0x0000,0x507c,0x60,0x7f,{{0x00,0x00,0x00,0x00},{0xf00007,0xf00007,0xf00007,0xffffff},{0x600001,0x600003,0x600005,0x000000},0,1,NULL,NULL,default_regs_r,custom_regs_w}},
/* Super King Kong 99 */
{0x0000,0x7d6e,0x60,0x7f,{{0x00,0x00,0x00,0x00},{0xf00007,0xf00007,0xf00007,0xffffff},{0x600001,0x600003,0x600005,0x000000},0,1,NULL,NULL,default_regs_r,custom_regs_w}},
/* Gunfight 3-in-1 */
{0x0000,0x6ff8,0x60,0x7f,{{0x00,0x00,0x00,0x00},{0xf00007,0xf00007,0xf00007,0xffffff},{0x600001,0x600003,0x600005,0x000000},0,1,NULL,NULL,default_regs_r,custom_regs_w}},
/* Pokemon Stadium */
{0x0000,0x843c,0x70,0x7f,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},0,1,NULL,NULL,NULL,custom_regs_w}},
/* Tekken 3 Special (original dump) (a bootleg version also exists, with patched protection & different boot routine which reads unused !TIME mapped area) */
{0x0000,0xc2f0,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},0,0,NULL,NULL,tekken_regs_r,tekken_regs_w}},
/* Lion King 2 */
{0xffff,0x1d9b,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xfffffd,0xfffffd,0xffffff,0xffffff},{0x400000,0x400004,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,default_regs_w}},
/* Squirell King */
{0x0000,0x8ec8,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xfffffd,0xfffffd,0xffffff,0xffffff},{0x400000,0x400004,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,default_regs_w}},
/* Tiny Toon Adventures 3 */
{0x2020,0xed9c,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xfffffd,0xfffffd,0xffffff,0xffffff},{0x400000,0x400004,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,default_regs_w}},
/* Lian Huan Pao - Barver Battle Saga (registers accessed by Z80, related to sound engine ?) */
{0x30b9,0x1c2a,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xfffffd,0xfffffd,0xffffff,0xffffff},{0x400000,0x400004,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,default_regs_w}},
/* Shui Hu Zhuan (registers accessed by Z80, related to sound engine ?) */
{0x6001,0x0211,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xfffffd,0xfffffd,0xffffff,0xffffff},{0x400000,0x400004,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,default_regs_w}},
/* Feng Shen Ying Jie Chuan (registers accessed by Z80, related to sound engine ?) */
{0xffff,0x5d98,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xfffffd,0xfffffd,0xffffff,0xffffff},{0x400000,0x400004,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,default_regs_w}},
/* (*) Shui Hu - Feng Yun Zhuan (patched ROM, unused registers) */
{0x3332,0x872b,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xfffffd,0xfffffd,0xffffff,0xffffff},{0x400000,0x400004,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,default_regs_w}},
/* (*) Chao Ji Da Fu Weng (patched ROM, various words witten to register, long word also read from $7E0000, unknown banking hardware ?) */
{0xa697,0xa697,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x000000,0x000000,0x000000},0,0,NULL,NULL,NULL,default_regs_w}},
/* (*) Aq Renkan Awa (patched ROM, ON/OFF bit sequence is written to register, unknown banking hardware ?) */
{0x8104,0x0517,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400001,0x000000,0x000000,0x000000},0,0,NULL,NULL,NULL,default_regs_w}},
/* (*) Tun Shi Tian Di III (patched ROM, unused register) */
{0x0000,0x9c5e,0x40,0x40,{{0xab,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400046,0x000000,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,NULL}},
/* Ma Jiang Qing Ren - Ji Ma Jiang Zhi */
{0x0000,0x7037,0x40,0x40,{{0x90,0xd3,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x401000,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,NULL}},
/* Super Majon Club */
{0x0000,0x3b95,0x40,0x40,{{0x90,0xd3,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x401000,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,NULL}},
/* Feng Kuang Tao Hua Yuan (original version from Creaton Softec Inc) (a bootleg version also exists with patched protection and minor title screen variations) */
{0x0000,0x9dc4,0x40,0x40,{{0x90,0xd3,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x401000,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,NULL}},
/* (*) Jiu Ji Ma Jiang II - Ye Yan Bian (patched ROM, using expected register value - $0f - crashes the game) (uses 16-bits reads) */
{0x0c44,0xba81,0x40,0x40,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x400006},0,0,NULL,NULL,default_regs_r_16,NULL}},
/* 16 Zhang Ma Jiang (uses 16-bits reads) */
{0xfb40,0x4bed,0x40,0x40,{{0x00,0xaa,0x00,0xf0},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x400002,0x000000,0x400006},0,0,NULL,NULL,default_regs_r_16,NULL}},
/* 16 Tiles Mahjong II (uses 16-bits reads) */
{0xffff,0x0903,0x40,0x40,{{0x00,0x00,0xc9,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x400004,0x000000},0,0,NULL,NULL,default_regs_r_16,NULL}},
/* Thunderbolt II (uses 16-bits reads) */
{0x0000,0x1585,0x40,0x40,{{0x55,0x0f,0xaa,0xf0},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r_16,NULL}},
/* Chaoji Puke - Super Poker (correct ROM dump, original release is an overdump) */
{0xffff,0xd7b0,0x40,0x40,{{0x55,0x0f,0xaa,0xf0},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* Super Bubble Bobble */
{0x0000,0x16cd,0x40,0x40,{{0x55,0x0f,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x000000,0x000000},0,0,NULL,NULL,default_regs_r,NULL}},
/* Tenchi wo Kurau II - The Battle of Red Cliffs (Unl) */
{0x0000,0xed61,0x40,0x40,{{0x55,0x0f,0xaa,0xf0},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* Huan Le Tao Qi Shu - Smart Mouse */
{0x0000,0x1a28,0x40,0x40,{{0x55,0x0f,0xaa,0xf0},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* (*) Hei Tao 2 - Super Big 2 (patched ROM, unused registers) */
{0x0000,0x5843,0x40,0x40,{{0x55,0x0f,0xaa,0xf0},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* Mighty Morphin Power Rangers - The Fighting Edition */
{0x0000,0x2288,0x40,0x40,{{0x55,0x0f,0xc9,0x18},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* Elf Wor */
{0x0080,0x3dba,0x40,0x40,{{0x55,0x0f,0xc9,0x18},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* Ya-Se Chuanshuo */
{0xffff,0xd472,0x40,0x40,{{0x63,0x98,0xc9,0x18},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* 777 Casino (For first one, 0x55 works as well. Other values are never used so they are guessed from on other unlicensed games using similar mapper) */
{0x0000,0xf8d9,0x40,0x40,{{0x63,0x98,0xc9,0x18},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* Wu Kong Wai Zhuan (original) (a bootleg version also exists, with patched protection & modified SRAM test routine ?) */
{0x0000,0x19ff,0x40,0x40,{{0x63,0x98,0xc9,0x18},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* Soul Blade */
{0x0000,0x0c5b,0x40,0x40,{{0x63,0x98,0xc9,0xf0},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,NULL,NULL,default_regs_r,NULL}},
/* King of Fighter 98 */
{0x0000,0xd0a0,0x48,0x4f,{{0x00,0x00,0xaa,0xf0},{0xffffff,0xffffff,0xfc0000,0xfc0000},{0x000000,0x000000,0x480000,0x4c0000},0,0,NULL,NULL,default_regs_r,NULL}},
/* Rockman X3 (bootleg version ? two last register returned values are ignored, note that 0xaa/0x18 would work as well) */
{0x0000,0x9d0e,0x40,0x40,{{0x0c,0x00,0xc9,0xf0},{0xffffff,0xffffff,0xffffff,0xffffff},{0xa13000,0x000000,0x400004,0x400006},0,0,default_regs_r,NULL,default_regs_r,NULL}},
/* (*) Dragon Ball Final Bout (patched ROM, in original code, different switches occurs depending on returned value $00-$0f) */
{0xc65a,0xc65a,0x00,0x00,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0xa13000,0x000000,0x000000,0x000000},0,0,default_regs_r,NULL,NULL,NULL}},
/* (*) Yang Jia Jiang - Yang Warrior Family (patched ROM, register value unused) */
{0x0000,0x96b0,0x00,0x00,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0xa13000,0x000000,0x000000,0x000000},0,0,default_regs_r,NULL,NULL,NULL}},
/* Super Mario 2 1998 */
{0xffff,0x0474,0x00,0x00,{{0x0a,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0xa13000,0x000000,0x000000,0x000000},0,0,default_regs_r,NULL,NULL,NULL}},
/* Super Mario World */
{0x2020,0xb4eb,0x00,0x00,{{0x1c,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0xa13000,0x000000,0x000000,0x000000},0,0,default_regs_r,NULL,NULL,NULL}},
/* King of Fighter 99 */
{0x0000,0x021e,0x00,0x00,{{0x00,0x01,0x1f,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0xa13000,0xa13002,0xa1303e,0x000000},0,0,custom_regs_r,default_regs_w,NULL,NULL}},
/* Pocket Monster */
{0xd6fc,0x1eb1,0x00,0x00,{{0x00,0x01,0x1f,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0xa13000,0xa13002,0xa1303e,0x000000},0,0,custom_regs_r,default_regs_w,NULL,NULL}},
/* Pocket Monster (bootleg version ? two last register returned values are ignored & first register test has been modified) */
{0xd6fc,0x6319,0x00,0x00,{{0x14,0x01,0x1f,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0xa13000,0xa13002,0xa1303e,0x000000},0,0,default_regs_r,m68k_unused_8_w,NULL,NULL}},
/* A Bug's Life (bootleg version ? two last register returned values are ignored & first register test has been modified ?) */
{0x7f7f,0x2aad,0x00,0x00,{{0x28,0x01,0x1f,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0xa13000,0xa13002,0xa1303e,0x000000},0,0,default_regs_r,m68k_unused_8_w,NULL,NULL}},
/* Game no Kanzume Otokuyou */
{0x0000,0xf9d1,0x00,0x00,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},0,0,NULL,mapper_seganet_w,NULL,NULL}},
/* Top Shooter (arcade hardware) */
{0xffff,0x3632,0x20,0x20,{{0x00,0x00,0x00,0x00},{0xffffff,0xffffff,0xffffff,0xffffff},{0x000000,0x000000,0x000000,0x000000},0,0,NULL,NULL,topshooter_r,topshooter_w}}
};
/************************************************************
Cart Hardware initialization
*************************************************************/
void md_cart_init(void)
{
int i;
/***************************************************************************************************************
CARTRIDGE ROM MIRRORING
***************************************************************************************************************
MD Cartridge area is mapped to $000000-$3fffff:
-> when accessing ROM, 68k address lines A1 to A21 can be used by the internal cartridge hardware to decode
full 4MB address range.
-> depending on ROM total size and additional decoding hardware, some address lines might be ignored,
resulting in ROM mirroring.
Cartridges can use either 8-bits (x2) or 16-bits (x1, x2) Mask ROM chips, each chip size is a factor of 2 bytes:
-> two 8-bits chips are equivalent to one 16-bits chip, no specific address decoding is required, needed
address lines are simply connected to each chip, upper address lines are ignored and data lines are
connected appropriately to each chip (D0-D7 to one chip, D8-D15 to the other one).
ROM is generally mirrored each N bytes where N=2^(k+1) is the total ROM size (ROM1+ROM2,ROM1+ROM2,...)
-> one single 16-bits chip do not need specific address decoding, address lines are simply connected
depending on the ROM size, upper address lines being ignored.
ROM is generally mirrored each N bytes where N=2^k is the size of the ROM chip (ROM1,ROM1,ROM1,...)
-> two 16-bits chips of the same size are equivalent to one chip of double size, address decoding generally
is the same except that specific hardware is used (one address line is generally used for chip selection,
lower ones being used to address the chips and upper ones being ignored).
ROM is generally mirrored each N bytes where N=2^(k+1) is the total ROM size (ROM1,ROM2,ROM1,ROM2,...)
-> two 16-bits chips with different size are mapped differently. Address decoding is done the same way as
above (one address line used for chip selection) but the ignored & required address lines differ from
one chip to another, which makes ROM mirroring different.
ROM2 size is generally half of ROM1 size and upper half ignored (ROM1,ROM2,XXXX,ROM1,ROM2,XXXX,...)
From the emulator point of view, we only need to distinguish 2 cases:
1/ total ROM size is a factor of 2: ROM is mirrored each 2^k bytes.
2/ total ROM size is not a factor of 2: ROM is padded up to 2^k then mirrored each 2^k bytes.
******************************************************************************************************************/
/* calculate nearest size with factor of 2 */
unsigned int size = 0x10000;
while (cart.romsize > size)
size <<= 1;
/* Sonic & Knuckles */
if (strstr(rominfo.international,"SONIC & KNUCKLES"))
{
/* disable ROM mirroring at $200000-$3fffff (normally mapped to external cartridge) */
size = 0x400000;
}
/* total ROM size is not a factor of 2 */
/* TODO: handle all possible ROM configurations using cartridge database */
if (cart.romsize < size)
{
if (size < MAXROMSIZE)
{
/* ROM is padded up to 2^k bytes */
memset(cart.rom + cart.romsize, 0xff, size - cart.romsize);
}
else
{
/* ROM is padded up to max ROM size */
memset(cart.rom + cart.romsize, 0xff, MAXROMSIZE - cart.romsize);
}
}
/* ROM is mirrored each 2^k bytes */
cart.mask = size - 1;
/* no special external hardware required by default */
cart.special = 0;
/**********************************************
DEFAULT CARTRIDGE MAPPING
***********************************************/
for (i=0; i<0x40; i++)
{
/* cartridge ROM */
m68k.memory_map[i].base = cart.rom + ((i<<16) & cart.mask);
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].read = NULL;
zbank_memory_map[i].write = zbank_unused_w;
}
for (i=0x40; i<0x80; i++)
{
/* unused area */
m68k.memory_map[i].base = cart.rom + (i<<16);
m68k.memory_map[i].read8 = m68k_read_bus_8;
m68k.memory_map[i].read16 = m68k_read_bus_16;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].read = zbank_unused_r;
zbank_memory_map[i].write = zbank_unused_w;
}
/* support for Quackshot REV 01 (real) dump */
if (strstr(rominfo.product,"00004054-01") && (cart.romsize == 0x80000))
{
/* $000000-$0fffff: first 256K mirrored (A18 not connected to ROM chip, A19 not decoded) */
for (i=0x00; i<0x10; i++)
{
/* $200000-$3fffff: mirror of $000000-$1fffff (A21 not decoded) */
m68k.memory_map[i].base = m68k.memory_map[i + 0x20].base = cart.rom + ((i & 0x03) << 16);
}
/* $100000-$1fffff: second 256K mirrored (A20 connected to ROM chip A18) */
for (i=0x10; i<0x20; i++)
{
/* $200000-$3fffff: mirror of $000000-$1fffff (A21 not decoded) */
m68k.memory_map[i].base = m68k.memory_map[i + 0x20].base = cart.rom + 0x40000 + ((i & 0x03) << 16);
}
}
/**********************************************
BACKUP MEMORY
***********************************************/
sram_init();
eeprom_i2c_init();
/* external SRAM */
if (sram.on && !sram.custom)
{
/* initialize default memory mapping for SRAM */
m68k.memory_map[sram.start >> 16].base = sram.sram;
m68k.memory_map[sram.start >> 16].read8 = sram_read_byte;
m68k.memory_map[sram.start >> 16].read16 = sram_read_word;
m68k.memory_map[sram.start >> 16].write8 = sram_write_byte;
m68k.memory_map[sram.start >> 16].write16 = sram_write_word;
zbank_memory_map[sram.start >> 16].read = sram_read_byte;
zbank_memory_map[sram.start >> 16].write = sram_write_byte;
}
/**********************************************
SVP CHIP
***********************************************/
svp = NULL;
if (strstr(rominfo.international,"Virtua Racing"))
{
svp_init();
}
/**********************************************
LOCK-ON
***********************************************/
/* clear existing patches */
ggenie_shutdown();
areplay_shutdown();
/* initialize extra hardware */
switch (config.lock_on)
{
case TYPE_GG:
{
ggenie_init();
break;
}
case TYPE_AR:
{
areplay_init();
break;
}
case TYPE_SK:
{
/* store S&K ROM above cartridge ROM (and before backup memory) */
if (cart.romsize > 0x600000) break;
/* try to load Sonic & Knuckles ROM file (2 MB) */
if (load_archive(SK_ROM, cart.rom + 0x600000, 0x200000, NULL) == 0x200000)
{
/* check ROM header */
if (!memcmp(cart.rom + 0x600000 + 0x120, "SONIC & KNUCKLES",16))
{
/* try to load Sonic 2 & Knuckles UPMEM ROM (256 KB) */
if (load_archive(SK_UPMEM, cart.rom + 0x900000, 0x40000, NULL) == 0x40000)
{
/* $000000-$1FFFFF is mapped to S&K ROM */
for (i=0x00; i<0x20; i++)
{
m68k.memory_map[i].base = cart.rom + 0x600000 + (i << 16);
}
#ifdef LSB_FIRST
for (i=0; i<0x200000; i+=2)
{
/* Byteswap ROM */
uint8 temp = cart.rom[i + 0x600000];
cart.rom[i + 0x600000] = cart.rom[i + 0x600000 + 1];
cart.rom[i + 0x600000 + 1] = temp;
}
for (i=0; i<0x40000; i+=2)
{
/* Byteswap ROM */
uint8 temp = cart.rom[i + 0x900000];
cart.rom[i + 0x900000] = cart.rom[i + 0x900000 + 1];
cart.rom[i + 0x900000 + 1] = temp;
}
#endif
cart.special |= HW_LOCK_ON;
}
}
}
break;
}
default:
{
break;
}
}
/**********************************************
CARTRIDGE EXTRA HARDWARE
***********************************************/
memset(&cart.hw, 0, sizeof(cart.hw));
/* search for game into database */
for (i=0; i<(sizeof(rom_database)/sizeof(md_entry_t)); i++)
{
/* known cart found ! */
if ((rominfo.checksum == rom_database[i].chk_1) &&
(rominfo.realchecksum == rom_database[i].chk_2))
{
int j = rom_database[i].bank_start;
/* retrieve hardware information */
memcpy(&cart.hw, &(rom_database[i].cart_hw), sizeof(cart.hw));
/* initialize memory handlers for $400000-$7FFFFF region */
while (j <= rom_database[i].bank_end)
{
if (cart.hw.regs_r)
{
m68k.memory_map[j].read8 = cart.hw.regs_r;
m68k.memory_map[j].read16 = cart.hw.regs_r;
zbank_memory_map[j].read = cart.hw.regs_r;
}
if (cart.hw.regs_w)
{
m68k.memory_map[j].write8 = cart.hw.regs_w;
m68k.memory_map[j].write16 = cart.hw.regs_w;
zbank_memory_map[j].write = cart.hw.regs_w;
}
j++;
}
/* leave loop */
break;
}
}
/* Realtec mapper */
if (cart.hw.realtec)
{
/* 8k BOOT ROM */
for (i=0; i<8; i++)
{
memcpy(cart.rom + 0x900000 + i*0x2000, cart.rom + 0x7e000, 0x2000);
}
/* BOOT ROM is mapped to $000000-$3FFFFF */
for (i=0x00; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + 0x900000;
}
}
/* detect specific mappers */
if (strstr(rominfo.consoletype,"SEGA SSF"))
{
/* Everdrive extended SSF mapper */
cart.hw.time_w = mapper_512k_w;
/* cartridge ROM mapping is reinitialized on /VRES */
cart.hw.bankshift = 1;
}
else if (strstr(rominfo.domestic,"SUPER STREET FIGHTER2"))
{
/* SSF2 mapper */
cart.hw.time_w = mapper_ssf2_w;
/* cartridge ROM mapping is reinitialized on /VRES */
cart.hw.bankshift = 1;
}
else if (strstr(rominfo.product,"T-5740"))
{
/* T-5740XX-XX mapper */
cart.hw.bankshift = 1;
m68k.memory_map[0x01].read8 = mapper_t5740_r;
zbank_memory_map[0x01].read = mapper_t5740_r;
/* specific !TIME handlers */
cart.hw.time_w = mapper_t5740_w;
cart.hw.time_r = eeprom_spi_read;
/* initialize SPI EEPROM board */
eeprom_spi_init();
}
else if (strstr(rominfo.ROMType,"SF") && strstr(rominfo.product,"001"))
{
/* SF-001 mapper */
m68k.memory_map[0x00].write8 = mapper_sf001_w;
m68k.memory_map[0x00].write16 = mapper_sf001_w;
zbank_memory_map[0x00].write = mapper_sf001_w;
/* no !TIME handler */
cart.hw.time_w = m68k_unused_8_w;
/* cartridge ROM is mapped to $3C0000-$3FFFFF on reset */
for (i=0x3c; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + (i << 16);
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].read = NULL;
zbank_memory_map[i].write = m68k_unused_8_w;
}
}
else if (strstr(rominfo.ROMType,"SF") && strstr(rominfo.product,"002"))
{
/* SF-002 mapper */
m68k.memory_map[0x00].write8 = mapper_sf002_w;
m68k.memory_map[0x00].write16 = mapper_sf002_w;
zbank_memory_map[0x00].write = mapper_sf002_w;
/* no !TIME handler */
cart.hw.time_w = m68k_unused_8_w;
}
else if (strstr(rominfo.ROMType,"SF") && strstr(rominfo.product,"004"))
{
/* SF-004 mapper */
m68k.memory_map[0x00].write8 = mapper_sf004_w;
m68k.memory_map[0x00].write16 = mapper_sf004_w;
zbank_memory_map[0x00].write = mapper_sf004_w;
/* specific !TIME handlers */
cart.hw.time_r = mapper_sf004_r;
cart.hw.time_w = m68k_unused_8_w;
/* first 256K ROM bank is mirrored into $000000-$1FFFFF on reset */
for (i=0x00; i<0x20; i++)
{
m68k.memory_map[i].base = cart.rom + ((i & 0x03) << 16);
}
/* 32K static RAM mapped to $200000-$2FFFFF is disabled on reset */
for (i=0x20; i<0x30; i++)
{
m68k.memory_map[i].base = sram.sram;
m68k.memory_map[i].read8 = m68k_read_bus_8;
m68k.memory_map[i].read16 = m68k_read_bus_16;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].read = m68k_read_bus_8;
zbank_memory_map[i].write = zbank_unused_w;
}
/* $300000-$3FFFFF is not mapped */
for (i=0x30; i<0x40; i++)
{
m68k.memory_map[i].read8 = m68k_read_bus_8;
m68k.memory_map[i].read16 = m68k_read_bus_16;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].read = m68k_read_bus_8;
zbank_memory_map[i].write = zbank_unused_w;
}
}
else if (strstr(rominfo.ROMType,"GM") && strstr(rominfo.product,"00000000-42"))
{
/* Flashkit MD mapper */
m68k.memory_map[0x00].write8 = mapper_flashkit_w;
m68k.memory_map[0x00].write16 = mapper_flashkit_w;
zbank_memory_map[0x00].write = mapper_flashkit_w;
}
else if ((*(uint16 *)(cart.rom + 0x08) == 0x6000) && (*(uint16 *)(cart.rom + 0x0a) == 0x01f6) && (rominfo.realchecksum == 0xf894))
{
/* Super Mario World 64 (unlicensed) mapper */
for (i=0x08; i<0x10; i++)
{
/* lower 512KB mirrored */
m68k.memory_map[i].base = cart.rom + ((i & 7) << 16);
}
for (i=0x10; i<0x40; i++)
{
/* unused area */
m68k.memory_map[i].read8 = m68k_read_bus_8;
m68k.memory_map[i].read16 = m68k_read_bus_16;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].read = m68k_read_bus_8;
zbank_memory_map[i].write = zbank_unused_w;
}
for (i=0x60; i<0x70; i++)
{
/* custom hardware */
m68k.memory_map[i].base = cart.rom + 0x0f0000;
m68k.memory_map[i].read8 = ((i & 0x07) < 0x04) ? NULL : mapper_smw_64_r;
m68k.memory_map[i].read16 = ((i & 0x07) < 0x04) ? NULL : mapper_smw_64_r;
m68k.memory_map[i].write8 = mapper_smw_64_w;
m68k.memory_map[i].write16 = mapper_smw_64_w;
zbank_memory_map[i].read = ((i & 0x07) < 0x04) ? NULL : mapper_smw_64_r;
zbank_memory_map[i].write = mapper_smw_64_w;
}
}
else if (cart.romsize > 0x400000)
{
/* assume linear ROM mapping by default (max. 10MB) */
for (i=0x40; i<0xA0; i++)
{
m68k.memory_map[i].base = cart.rom + (i<<16);
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
zbank_memory_map[i].read = NULL;
}
}
/* default write handler for !TIME range ($A130xx)*/
if (!cart.hw.time_w)
{
cart.hw.time_w = default_time_w;
}
}
/* hardware that need to be reseted on power on */
void md_cart_reset(int hard_reset)
{
int i;
/* reset cartridge mapping */
if (cart.hw.bankshift)
{
for (i=0x00; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + ((i<<16) & cart.mask);
}
}
/* SVP chip */
if (svp)
{
svp_reset();
}
/* Lock-ON */
switch (config.lock_on)
{
case TYPE_GG:
{
ggenie_reset(hard_reset);
break;
}
case TYPE_AR:
{
areplay_reset(hard_reset);
break;
}
case TYPE_SK:
{
if (cart.special & HW_LOCK_ON)
{
/* disable UPMEM chip at $300000-$3fffff */
for (i=0x30; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + ((i<<16) & cart.mask);
}
}
break;
}
default:
{
break;
}
}
}
int md_cart_context_save(uint8 *state)
{
int i;
int bufferptr = 0;
uint8 *base;
/* cartridge mapping */
for (i=0; i<0x40; i++)
{
/* get base address */
base = m68k.memory_map[i].base;
if (base == sram.sram)
{
/* SRAM */
state[bufferptr++] = 0xff;
}
else if (base >= cart.rom && base < cart.rom + MAXROMSIZE)
{
/* ROM */
state[bufferptr++] = ((base - cart.rom) >> 16) & 0xff;
}
else
{
/* TMSS or special cartridge rom */
state[bufferptr++] = 0xfe;
}
}
/* hardware registers */
save_param(cart.hw.regs, sizeof(cart.hw.regs));
/* SVP */
if (svp)
{
save_param(svp->iram_rom, 0x800);
save_param(svp->dram,sizeof(svp->dram));
save_param(&svp->ssp1601,sizeof(ssp1601_t));
}
return bufferptr;
}
int md_cart_context_load(uint8 *state)
{
int i;
int bufferptr = 0;
uint8 offset;
/* cartridge mapping */
for (i=0; i<0x40; i++)
{
/* get offset */
offset = state[bufferptr++];
if (offset == 0xff)
{
/* SRAM */
m68k.memory_map[i].base = sram.sram;
m68k.memory_map[i].read8 = sram_read_byte;
m68k.memory_map[i].read16 = sram_read_word;
m68k.memory_map[i].write8 = sram_write_byte;
m68k.memory_map[i].write16 = sram_write_word;
zbank_memory_map[i].read = sram_read_byte;
zbank_memory_map[i].write = sram_write_byte;
}
else if (offset < (MAXROMSIZE >> 16))
{
/* check if SRAM was mapped there before loading state */
if (m68k.memory_map[i].base == sram.sram)
{
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].read = NULL;
zbank_memory_map[i].write = zbank_unused_w;
}
/* ROM */
m68k.memory_map[i].base = cart.rom + (offset << 16);
}
else
{
/* TMSS or Special cartridge ROM mapped in by reset, leave it mapped */
}
}
/* hardware registers */
load_param(cart.hw.regs, sizeof(cart.hw.regs));
/* SVP */
if (svp)
{
load_param(svp->iram_rom, 0x800);
load_param(svp->dram,sizeof(svp->dram));
load_param(&svp->ssp1601,sizeof(ssp1601_t));
}
return bufferptr;
}
/************************************************************
MAPPER handlers
*************************************************************/
/*
"official" ROM/SRAM bankswitch (Phantasy Star IV, Story of Thor/Beyond Oasis, Sonic 3 & Knuckles)
*/
static void mapper_sega_w(uint32 data)
{
int i;
if (data & 1)
{
if (sram.on)
{
/* Backup RAM mapped to $200000-$20ffff (normally mirrored up to $3fffff but this breaks Sonic Megamix and no game need it) */
m68k.memory_map[0x20].base = sram.sram;
m68k.memory_map[0x20].read8 = sram_read_byte;
m68k.memory_map[0x20].read16 = sram_read_word;
zbank_memory_map[0x20].read = sram_read_byte;
/* Backup RAM write protection */
if (data & 2)
{
m68k.memory_map[0x20].write8 = m68k_unused_8_w;
m68k.memory_map[0x20].write16 = m68k_unused_16_w;
zbank_memory_map[0x20].write = zbank_unused_w;
}
else
{
m68k.memory_map[0x20].write8 = sram_write_byte;
m68k.memory_map[0x20].write16 = sram_write_word;
zbank_memory_map[0x20].write = sram_write_byte;
}
}
/* S&K lock-on chip */
if ((cart.special & HW_LOCK_ON) && (config.lock_on == TYPE_SK))
{
/* S2K upmem chip mapped to $300000-$3fffff (256K mirrored) */
for (i=0x30; i<0x40; i++)
{
m68k.memory_map[i].base = (cart.rom + 0x900000) + ((i & 3) << 16);
}
}
}
else
{
/* cartridge ROM mapped to $200000-$3fffff */
for (i=0x20; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + ((i<<16) & cart.mask);
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
zbank_memory_map[i].read = NULL;
m68k.memory_map[i].write8 = m68k_unused_8_w;
m68k.memory_map[i].write16 = m68k_unused_16_w;
zbank_memory_map[i].write = zbank_unused_w;
}
}
}
/*
Everdrive extended SSF ROM bankswitch
documented by Krikzz (http://krikzz.com/pub/support/mega-ed/dev/extended_ssf.txt)
*/
static void mapper_512k_w(uint32 address, uint32 data)
{
uint32 i;
/* 512K ROM paging */
uint8 *src = cart.rom + (data << 19);
/* cartridge area ($000000-$3FFFFF) is divided into 8 x 512K banks */
address = (address << 2) & 0x38;
/* remap selected ROM page to selected bank */
for (i=0; i<8; i++)
{
m68k.memory_map[address++].base = src + (i<<16);
}
}
/*
Super Street Fighter 2 ROM bankswitch
documented by Bart Trzynadlowski (http://emu-docs.org/Genesis/ssf2.txt)
*/
static void mapper_ssf2_w(uint32 address, uint32 data)
{
/* only banks 1-7 are remappable, bank 0 remains unchanged */
if (address & 0x0E)
{
mapper_512k_w(address, data);
}
}
/*
SF-001 mapper
*/
static void mapper_sf001_w(uint32 address, uint32 data)
{
switch ((address >> 8) & 0xf)
{
case 0xe:
{
int i;
/* bit 6: enable / disable cartridge access */
if (data & 0x40)
{
/* $000000-$3FFFFF is not mapped */
for (i=0x00; i<0x40; i++)
{
m68k.memory_map[i].base = cart.rom + (i << 16);
m68k.memory_map[i].read8 = m68k_read_bus_8;
m68k.memory_map[i].read16 = m68k_read_bus_16;
m68k.memory_map[i].write8 = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
m68k.memory_map[i].write16 = (i > 0x00) ? m68k_unused_16_w : mapper_sf001_w;
zbank_memory_map[i].read = zbank_unused_r;
zbank_memory_map[i].write = (i > 0x00) ? m68k_unused_8_w : mapper_sf001_w;
}
}
/* bit 7: enable / disable SRAM & ROM bankswitching */
else if (data & 0x80)
{
/* 256K ROM bank #15 mapped to $000000-$03FFFF */
for (i=0x00; i<0x04; i++)
{
m68k.memory_map[i].base = cart.rom + ((0x38 + i) << 16);
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
zbank_memory_map[i].read = NULL;
}
/* 256K ROM banks #2 to #15 mapped to $040000-$3BFFFF (last revision) or $040000-$3FFFFF (older revisions) */
for (i=0x04; i<(sram.start >> 16); i++)
{
m68k.memory_map[i].base = cart.rom + (i << 16);
m68k.memory_map[i].read8 = NULL;
m68k.memory_map[i].read16 = NULL;
zbank_memory_map[i].read = NULL;
}
/* 32K static RAM mirrored into $3C0000-$3FFFFF (odd bytes only) (last revision only) */
while (i<0x40)
{
m68k.memory_map[i].base = sram.sram;
m68k.memory_map[i].read8 = sram_read_byte;
m68k.memory_map[i].read16 = sram_read_word;
m68k.memory_map[i].write8 = sram_write_byte;
m68k.memory_map[i].write16 = sram_write_word;