mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-10 04:45:08 +01:00
601 lines
18 KiB
C
601 lines
18 KiB
C
/****************************************************************************
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* Genesis Plus 1.2a
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* Cartridge Hardware support
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*
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* code by Eke-Eke, GC/Wii port
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*
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* Lots of protection mechanism have been discovered by Haze
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* (http://haze.mameworld.info/)
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*
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* Realtec mapper has been figured out by TascoDeluxe
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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***************************************************************************/
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#include "shared.h"
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#include "m68kcpu.h"
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#define CART_CNT 26
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/* Function prototypes */
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void default_time_w(unsigned int address, unsigned int value);
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void special_mapper_w(unsigned int address, unsigned int value);
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void realtec_mapper_w(unsigned int address, unsigned int value);
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void seganet_mapper_w(unsigned int address, unsigned int value);
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unsigned int radica_mapper_r(unsigned int address);
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void default_regs_w(unsigned int address, unsigned int value);
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unsigned int default_regs_r(unsigned int address);
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void special_regs_w(unsigned int address, unsigned int value);
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/* Cart database entry */
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typedef struct
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{
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uint16 chk_1; /* header checksum */
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uint16 chk_2; /* real checksum */
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uint8 bank_start; /* first mapped bank in $400000-$7fffff region */
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uint8 bank_end; /* last mapped bank in $400000-$7fffff region */
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T_CART_HW cart_hw; /* hardware description */
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} T_CART_ENTRY;
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/* Games that need extra hardware emulation:
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- copy protection device
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- custom ROM banking device
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*/
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T_CART_ENTRY rom_database[CART_CNT] =
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{
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/* Game no Kanzume Otokuyou */
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{0x0000,0xf9d1,0,0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},0,0,seganet_mapper_w,0,0}},
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/* RADICA (Volume 1) (not byteswapped) */
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{0x0000,0x2326,0,0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},0,radica_mapper_r,0,0,0}},
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/* RADICA (Volume 2) */
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{0x4f10,0x0836,0,0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},0,radica_mapper_r,0,0,0}},
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/* RADICA (Volume 1) */
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{0xf424,0x9f82,0,0,{{0,0,0,0},{0,0,0,0},{0,0,0,0},0,radica_mapper_r,0,0,0}},
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/* Funny World & Balloon Boy */
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{0x0000,0x06ab,8,8,{{0,0,0,0},{0,0,0,0},{0,0,0,0},1,0,0,0,realtec_mapper_w}},
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/* Whac-a-Critter */
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{0xffff,0xf863,8,8,{{0,0,0,0},{0,0,0,0},{0,0,0,0},1,0,0,0,realtec_mapper_w}},
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/* Earth Defense */
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{0xffff,0x44fb,8,8,{{0,0,0,0},{0,0,0,0},{0,0,0,0},1,0,0,0,realtec_mapper_w}},
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/* Super Mario 2 1998 */
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{0xffff,0x0474,0,0,{{0x0a,0,0,0},{0xffffff,0,0,0},{0xa13000,0,0,0},0,default_regs_r,0,0,0}},
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/* Super Mario 2 1998 */
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{0x2020,0xb4eb,0,0,{{0x1c,0,0,0},{0xffffff,0,0,0},{0xa13000,0,0,0},0,default_regs_r,0,0,0}},
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/* Supper Bubble Bobble */
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{0x0000,0x16cd,8,8,{{0x55,0x0f,0,0},{0xffffff,0xffffff,0,0},{0x400000,0x400002,0,0},0,0,0,default_regs_r,0}},
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/* Mahjong Lover */
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{0x0000,0x7037,8,8,{{0x90,0xd3,0,0},{0xffffff,0xffffff,0,0},{0x400000,0x401000,0,0},0,0,0,default_regs_r,0}},
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/* Lion King 2 */
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{0xffff,0x1d9b,8,8,{{0,0,0,0},{0xfffffd,0xfffffd,0,0},{0x400000,0x400004,0,0},0,0,0,default_regs_r,default_regs_w}},
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/* Squirell King */
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{0x0000,0x8ec8,8,8,{{0,0,0,0},{0xfffffd,0xfffffd,0,0},{0x400000,0x400004,0,0},0,0,0,default_regs_r,default_regs_w}},
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/* Rockman X3 */
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{0x0000,0x9d0e,8,8,{{0x0c,0x88,0,0},{0xffffff,0xffffff,0,0},{0xa13000,0x400004,0,0},0,default_regs_r,0,default_regs_r,0}},
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/* A Bug's Life */
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{0x7f7f,0x2aad,0,0,{{0x28,0x1f,0x01,0},{0xffffff,0xffffff,0xffffff,0},{0xa13000,0xa13002,0xa1303e,0},0,default_regs_r,0,0,0}},
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/* King of Fighter 99 */
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{0x0000,0x21e,0,0,{{0x00,0x01,0x1f,0},{0xffffff,0xffffff,0xffffff,0},{0xa13000,0xa13002,0xa1303e,0},0,default_regs_r,0,0,0}},
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/* Pocket Monster */
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{0xd6fc,0x1eb1,0,0,{{0x00,0x01,0x1f,0},{0xffffff,0xffffff,0xffffff,0},{0xa13000,0xa13002,0xa1303e,0},0,default_regs_r,0,0,0}},
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/* Lion King 3 */
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{0x0000,0x507c,12,15,{{0,0,0,0},{0xf0000e,0xf0000e,0xf0000e,0},{0x600000,0x600002,0x600004,0},0,0,0,default_regs_r,special_regs_w}},
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/* Super King Kong 99 */
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{0x0000,0x7d6e,12,15,{{0,0,0,0},{0xf0000e,0xf0000e,0xf0000e,0},{0x600000,0x600002,0x600004,0},0,0,0,default_regs_r,special_regs_w}},
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/* Pokemon Stadium */
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{0x0000,0x843c,14,15,{{0,0,0,0},{0,0,0,0},{0,0,0,0},0,0,0,0,special_regs_w}},
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/* Elf Wor */
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{0x0080,0x3dba,8,8,{{0x55,0x0f,0xc9,0x18},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,0,default_regs_r,0}},
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/* Huan Le Tao Qi Shu - Smart Mouse */
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{0x0000,0x1a28,8,8,{{0x55,0x0f,0xaa,0xf0},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,0,default_regs_r,0}},
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/* Ya-Se Chuanshuo */
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{0xffff,0xd472,8,8,{{0x63,0x98,0xc9,0x18},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,0,default_regs_r,0}},
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/* Soul Blade */
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{0x0000,0x0c5b,8,8,{{0x00,0x98,0xc9,0xF0},{0xffffff,0xffffff,0xffffff,0xffffff},{0x400000,0x400002,0x400004,0x400006},0,0,0,default_regs_r,0}},
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/* King of Fighter 98 */
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{0x0000,0xd0a0,9,9,{{0xaa,0xa0,0xf0,0xa0},{0xfc0000,0xffffff,0xffffff,0xffffff},{0x480000,0x4c82c0,0x4cdda0,0x4f8820},0,0,0,default_regs_r,0}},
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/* Lian Huan Pao - Barver Battle Saga */
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{0x30b9,0x1c2a,8,8,{{0,0,0,0},{0,0,0,0},{0,0,0,0},0,0,0,default_regs_r,0}}
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};
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/* current cart hardware */
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T_CART_HW cart_hw;
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uint8 j_cart;
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static int old_system[2] = {-1,-1};
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/************************************************************
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Cart Hardware initialization
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*************************************************************/
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/* hardware that need to be reseted on power on */
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void cart_hw_reset()
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{
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/* Realtec mapper */
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if (cart_hw.realtec & 1)
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{
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int i;
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/* enable BOOTROM */
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for (i=0; i<8; i++) m68k_readmap_16[i] = REALTEC_ROM;
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cart_hw.realtec |= 2;
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}
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/* SVP chip */
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if (svp) svp_reset();
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}
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/* cart hardware detection */
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void cart_hw_init()
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{
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int i;
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/**********************************************
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DEFAULT CART MAPPING
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***********************************************/
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for (i=0; i<8; i++)
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{
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m68k_readmap_8[i] = ROM;
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m68k_readmap_16[i] = ROM;
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m68k_writemap_8[i] = UNUSED;
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m68k_writemap_16[i] = UNUSED;
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}
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for (i=8; i<16; i++)
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{
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m68k_readmap_8[i] = UNUSED;
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m68k_readmap_16[i] = UNUSED;
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m68k_writemap_8[i] = UNUSED;
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m68k_writemap_16[i] = UNUSED;
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}
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/* restore previous setting */
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if (old_system[0] != -1) input.system[0] = old_system[0];
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if (old_system[1] != -1) input.system[1] = old_system[1];
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/**********************************************
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EXTERNAL RAM
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***********************************************/
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sram_init();
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eeprom_init();
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if (sram.on)
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{
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if (sram.custom)
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{
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/* serial EEPROM */
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m68k_readmap_8[eeprom.type.sda_out_adr >> 19] = EEPROM;
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m68k_readmap_16[eeprom.type.sda_out_adr >> 19] = EEPROM;
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m68k_writemap_8[eeprom.type.sda_in_adr >> 19] = EEPROM;
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m68k_writemap_16[eeprom.type.sda_in_adr >> 19] = EEPROM;
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m68k_writemap_8[eeprom.type.scl_adr >> 19] = EEPROM;
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m68k_writemap_16[eeprom.type.scl_adr >> 19] = EEPROM;
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}
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else
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{
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/* 64KB SRAM */
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m68k_readmap_8[sram.start >> 19] = SRAM;
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m68k_readmap_16[sram.start >> 19] = SRAM;
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if (sram.write)
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{
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m68k_writemap_8[sram.start >> 19] = SRAM;
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m68k_writemap_16[sram.start >> 19] = SRAM;
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}
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}
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}
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/**********************************************
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SVP CHIP
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***********************************************/
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svp = NULL;
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if ((strstr(rominfo.product,"MK-1229") != NULL) ||
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(strstr(rominfo.product,"G-7001") != NULL))
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{
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svp_init();
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m68k_readmap_16[6] = SVP_DRAM;
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m68k_writemap_16[6] = SVP_DRAM;
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m68k_readmap_16[7] = SVP_CELL;
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m68k_writemap_16[7] = SVP_CELL;
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}
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/**********************************************
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SEGA MENACER
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***********************************************/
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input.x_offset = 0;
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input.y_offset = 0;
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if (strstr(rominfo.product,"MK-1658") != NULL) /* Menacer 6-in-1 pack */
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{
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/* save current setting */
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if (old_system[0] == -1) old_system[0] = input.system[0];
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if (old_system[1] == -1) old_system[1] = input.system[1];
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input.system[0] = NO_SYSTEM;
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input.system[1] = SYSTEM_MENACER;
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/* specific game adjustment */
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input.x_offset = 0x52;
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}
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else if (strstr(rominfo.product,"T-081156") != NULL) /* T2: Arcade Game */
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{
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input.system[0] = SYSTEM_GAMEPAD;
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input.system[1] = SYSTEM_MENACER;
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/* specific game adjustment */
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input.x_offset = 0x84;
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input.y_offset = 8;
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}
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else if (strstr(rominfo.product,"T-95136") != NULL) /* Lethal Enforcers II */
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{
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input.system[0] = SYSTEM_GAMEPAD;
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input.system[1] = SYSTEM_JUSTIFIER;
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/* specific game adjustment */
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input.x_offset = 0x18;
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}
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else if ((strstr(rominfo.product,"T-95096") != NULL) || /* Lethal Enforcers (USA,Europe) */
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(strstr(rominfo.product,"T-95073") != NULL)) /* Lethal Enforcers (J)*/
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{
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input.system[0] = SYSTEM_GAMEPAD;
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input.system[1] = SYSTEM_JUSTIFIER;
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}
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/**********************************************
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J-CART
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***********************************************/
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j_cart = 0;
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if (((strstr(rominfo.product,"00000000") != NULL) && (rominfo.checksum == 0x168b)) || /* Super Skidmarks, Micro Machines Military*/
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((strstr(rominfo.product,"00000000") != NULL) && (rominfo.checksum == 0x165e)) || /* Pete Sampras Tennis (1991), Micro Machines 96 */
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((strstr(rominfo.product,"00000000") != NULL) && (rominfo.checksum == 0xcee0)) || /* Micro Machines Military (bad) */
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((strstr(rominfo.product,"00000000") != NULL) && (rominfo.checksum == 0x2c41)) || /* Micro Machines 96 (bad) */
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((strstr(rominfo.product,"XXXXXXXX") != NULL) && (rominfo.checksum == 0xdf39)) || /* Sampras Tennis 96 */
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((strstr(rominfo.product,"T-123456") != NULL) && (rominfo.checksum == 0x1eae)) || /* Sampras Tennis 96 */
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((strstr(rominfo.product,"T-120066") != NULL) && (rominfo.checksum == 0x16a4)) || /* Pete Sampras Tennis (1994)*/
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(strstr(rominfo.product,"T-120096") != NULL)) /* Micro Machines 2 */
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{
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if (genromsize <= 0x380000) /* just to be sure (checksum might not be enough) */
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{
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j_cart = 1;
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m68k_readmap_16[7] = J_CART;
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m68k_writemap_16[7] = J_CART;
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/* save current setting */
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if (old_system[0] == -1) old_system[0] = input.system[0];
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if (old_system[1] == -1) old_system[1] = input.system[1];
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/* PORT B by default */
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input.system[0] = SYSTEM_GAMEPAD;
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input.system[1] = SYSTEM_GAMEPAD;
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}
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}
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/**********************************************
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ULTIMATE MK3 HACK
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***********************************************/
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if (genromsize > 0x600000)
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{
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for (i=8; i<20; i++)
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{
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m68k_readmap_8[i] = UMK3_HACK;
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m68k_readmap_16[i] = UMK3_HACK;
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}
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#if M68K_EMULATE_ADDRESS_ERROR
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/* this game does not work properly on real hardware */
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emulate_address_error = 0;
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#endif
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}
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#if M68K_EMULATE_ADDRESS_ERROR
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/* default behavior */
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else emulate_address_error = 1;
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#endif
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/**********************************************
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Mappers & HW registers
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***********************************************/
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memset(&cart_hw, 0, sizeof(cart_hw));
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/* default write handler for !TIME signal */
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cart_hw.time_w = default_time_w;
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/* search for game into database */
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for (i=0; i < CART_CNT + 1; i++)
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{
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/* known cart found ! */
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if ((rominfo.checksum == rom_database[i].chk_1) &&
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(realchecksum == rom_database[i].chk_2))
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{
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/* retrieve hardware information */
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memcpy(&cart_hw, &(rom_database[i].cart_hw), sizeof(cart_hw));
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/* initialize memory handlers for $400000-$7fffff region */
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int j = rom_database[i].bank_start;
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while (j <= rom_database[i].bank_end)
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{
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if (cart_hw.regs_r) m68k_readmap_8[j] = CART_HW;
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if (cart_hw.regs_w) m68k_writemap_8[j] = CART_HW;
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j++;
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}
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i = CART_CNT + 1;
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}
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}
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}
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/************************************************************
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MAPPER handlers
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*************************************************************/
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/*
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"official" ROM/RAM switch
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*/
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static inline void sega_mapper_w(unsigned int address, unsigned int value)
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{
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uint8 bank = (address >> 1) & 7;
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switch (bank)
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{
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case 0:
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{
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/* ROM/RAM switch (Phantasy Star IV, Story of Thor/Beyond Oasis, Sonic 3 & Knuckles) */
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if (value & 1)
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{
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/* SRAM is mapped above 200000h */
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m68k_readmap_8[4] = SRAM;
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m68k_readmap_16[4] = SRAM;
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if (value & 2)
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{
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/* SRAM write protected */
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m68k_writemap_8[4] = UNUSED;
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m68k_writemap_16[4] = UNUSED;
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}
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else
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{
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/* SRAM write enabled */
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m68k_writemap_8[4] = SRAM;
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m68k_writemap_16[4] = SRAM;
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}
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}
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else
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{
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/* ROM is mapped above 200000h */
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m68k_readmap_8[4] = ROM;
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m68k_readmap_16[4] = ROM;
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m68k_writemap_8[4] = UNUSED;
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m68k_writemap_16[4] = UNUSED;
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}
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break;
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}
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default:
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/* ROM Bankswitch (Super Street Fighter 2)
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documented by Bart Trzynadlowski (http://www.trzy.org/files/ssf2.txt)
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*/
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rom_readmap[bank] = &cart_rom[value << 19];
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break;
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}
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}
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/*
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custom ROM Bankswitch used by pirate "Multi-in-1" carts
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(documented by Haze)
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*/
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static inline void multi_mapper_w(unsigned int address, unsigned int value)
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{
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int i;
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uint32 bank_addr = (address & 0x3F) << 16;
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/* those games are generally not bigger than 1MB but it's safer to update all 512K banks */
|
|
for (i=0; i<8; i++)
|
|
{
|
|
if (bank_addr >= genromsize) return;
|
|
rom_readmap[i] = &cart_rom[bank_addr];
|
|
bank_addr += 0x80000;
|
|
}
|
|
}
|
|
|
|
/*
|
|
Special ROM Bankswitch used for copy protection
|
|
Used by unlicensed cartridges (Lion King III, Super King Kong 99)
|
|
(documented by Haze)
|
|
*/
|
|
void special_mapper_w(unsigned int address, unsigned int value)
|
|
{
|
|
rom_readmap[0] = &cart_rom[value << 15];
|
|
}
|
|
|
|
/*
|
|
Realtec ROM Bankswitch (Earth Defend, Balloon Boy & Funny World, Whac-A-Critter)
|
|
(documented by TascoDeluxe)
|
|
*/
|
|
void realtec_mapper_w(unsigned int address, unsigned int value)
|
|
{
|
|
uint32 base_addr;
|
|
|
|
if (cart_hw.realtec & 2)
|
|
{
|
|
int i;
|
|
cart_hw.realtec &= ~2;
|
|
|
|
/* disable Realtec BOOTROM */
|
|
for (i=0; i<8; i++)
|
|
{
|
|
m68k_readmap_8[i] = ROM;
|
|
m68k_readmap_16[i] = ROM;
|
|
}
|
|
}
|
|
|
|
switch (address)
|
|
{
|
|
case 0x404000: /* three lower bits of ROM base address */
|
|
cart_hw.regs[0] = value;
|
|
base_addr = (value | ((cart_hw.regs[1] & 6) << 2)) << 17;
|
|
rom_readmap[0] = &cart_rom[base_addr];
|
|
return;
|
|
|
|
case 0x400000: /* two higher bits of ROM base address */
|
|
cart_hw.regs[1] = value;
|
|
base_addr = ((cart_hw.regs[0] & 7) | ((value & 6) << 2)) << 17;
|
|
rom_readmap[0] = &cart_rom[base_addr];
|
|
return;
|
|
|
|
case 0x402000: /* size of ROM range to map */
|
|
cart_hw.regs[2] = value;
|
|
return;
|
|
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/* Game no Kanzume Otokuyou ROM Mapper */
|
|
void seganet_mapper_w(unsigned int address, unsigned int value)
|
|
{
|
|
int i;
|
|
switch (address & 0xff)
|
|
{
|
|
case 0x01:
|
|
if (value & 1)
|
|
{
|
|
/* ROM disabled */
|
|
for (i=0; i<8; i++)
|
|
{
|
|
m68k_readmap_8[i] = UNUSED;
|
|
m68k_readmap_16[i] = UNUSED;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* ROM enabled */
|
|
for (i=0; i<8; i++)
|
|
{
|
|
m68k_readmap_8[i] = ROM;
|
|
m68k_readmap_16[i] = ROM;
|
|
}
|
|
}
|
|
break;;
|
|
|
|
case 0xf1:
|
|
if (value & 1)
|
|
{
|
|
/* ROM Write protected*/
|
|
for (i=0; i<8; i++)
|
|
{
|
|
m68k_writemap_8[i] = UNUSED;
|
|
m68k_writemap_16[i] = UNUSED;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* ROM Write enabled */
|
|
for (i=0; i<8; i++)
|
|
{
|
|
m68k_writemap_8[i] = ROM;
|
|
m68k_writemap_16[i] = ROM;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
RADICA ROM Bankswitch
|
|
(documented by Haze)
|
|
*/
|
|
unsigned int radica_mapper_r(unsigned int address)
|
|
{
|
|
/* 64KB ROM banks */
|
|
uint8 bank = (address >> 1) & 0x3F;
|
|
rom_readmap[0] = &cart_rom[bank * 0x10000];
|
|
rom_readmap[1] = &cart_rom[bank * 0x10000 + 0x80000]; /* ROM is max. 1MB */
|
|
return 0xff;
|
|
}
|
|
|
|
|
|
/************************************************************
|
|
default !TIME signal handler
|
|
*************************************************************/
|
|
|
|
/* default ROM bankswitch */
|
|
void default_time_w(unsigned int address, unsigned int value)
|
|
{
|
|
if ((address & 0xf1) == 0xf1) sega_mapper_w(address, value);
|
|
else if (address < 0xa13040) multi_mapper_w(address, value);
|
|
}
|
|
|
|
/************************************************************
|
|
Internal register handlers
|
|
*************************************************************/
|
|
|
|
unsigned int default_regs_r(unsigned int address)
|
|
{
|
|
uint8 i;
|
|
for (i=0; i<4; i++)
|
|
{
|
|
if ((address & cart_hw.mask[i]) == cart_hw.addr[i])
|
|
return cart_hw.regs[i];
|
|
}
|
|
|
|
/* unused */
|
|
return -1;
|
|
}
|
|
|
|
void default_regs_w(unsigned int address, unsigned int value)
|
|
{
|
|
uint8 i;
|
|
for (i=0; i<4; i++)
|
|
{
|
|
if ((address & cart_hw.mask[i]) == cart_hw.addr[i])
|
|
{
|
|
cart_hw.regs[i] = value;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* special register behaviour (Lion King III, Super Donkey Kong 99) */
|
|
void special_regs_w(unsigned int address, unsigned int value)
|
|
{
|
|
/* ROM bankswitch */
|
|
if ((address >> 16) > 0x6f)
|
|
{
|
|
special_mapper_w(address, value);
|
|
return;
|
|
}
|
|
|
|
/* write regs */
|
|
default_regs_w(address, value);
|
|
|
|
/* bitswapping (documented by Haze) */
|
|
uint8 temp = cart_hw.regs[0];
|
|
switch (cart_hw.regs[1])
|
|
{
|
|
case 1:
|
|
cart_hw.regs[2] = (temp >> 1);
|
|
return;
|
|
|
|
case 2:
|
|
cart_hw.regs[2] = ((temp >> 4) | ((temp & 0x0F) << 4));
|
|
return;
|
|
|
|
default:
|
|
cart_hw.regs[2] = (((temp >> 7) & 0x01) | ((temp >> 5) & 0x02) |
|
|
((temp >> 3) & 0x04) | ((temp >> 1) & 0x08) |
|
|
((temp << 1) & 0x10) | ((temp << 3) & 0x20) |
|
|
((temp << 5) & 0x40) | ((temp << 7) & 0x80));
|
|
return;
|
|
}
|
|
}
|