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Genesis-Plus-GX/source/loadrom.c
ekeeke31 ab4638144c [Core/VDP] 
---------------
* added support for Master System compatibility mode (Z80 ports access mode), incl. Mode 5 rendering.
* added Mode 4 rendering for both Genesis & Master System modes.
* added alternate BG planes rendering functions (should be faster on PPC architectures).

[Core/IO]
---------------
* added support for Master System compatibility mode (Z80 ports access mode).
* added Master System peripherals emulation (Control Pad, Paddle, Sports Pad & Light Phaser).
* added XE-1AP (analog controller) emulation.
* added Activator emulation.

[Core/Extra]
---------------
* added support for all known Master System cartridge mappers.
* added copy-protection hardware emulation for a few MD unlicensed games: fixes 777 Casino (crash when talking to bunny girls).
(NB: most of those unlicensed games seem to have been already patched by ROM dumpers, main purpose is documenting them)
* added support for Top Shooter arcade board controller. (A=Shoot, B=Bet, C/RIGHT=Coins, START=Start, hold UP on startup to enter service mode)
* improved King of Fighters 98 mapper emulation (registers address decoding is now 100% accurate)
* fixed Game Genie when several codes affect same ROM address.
* fixed EEPROM types for Brian Lara Cricket & NBA Jam TE (verified on real cartridges)

[Core/General]
---------------
* added Master System compatibility mode emulation (automatically enabled when loading ROM file with .sms extension).
* improved savestate stability & compatibility (support for old 1.4.x savestates is preserved)
* various code cleanup & comments.

[Gamecube/Wii]
---------------
* fixed cheat codes handling when several codes affect same ROM address.
* improved input controller detection on menu exit.
* improved key remapping dialog box to match emulated device
* changed Menu key for Gamecube controller to allow MODE button mapping
* fixed DVD not being unmounted on swap (memory leak)

[Wii only]
---------------
* added USB mouse support for Sega Mouse emulation
* compiled with latest libogc: improves USB compatibility & fixes stability issues with Wiimotes.
2011-03-31 22:11:05 +00:00

610 lines
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/***************************************************************************************
* Genesis Plus
* ROM Loading Support
*
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
* Eke-Eke (2007,2008,2009), additional code & fixes for the GCN/Wii port
*
* 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 <ctype.h>
#include "shared.h"
/*** ROM Information ***/
#define ROMCONSOLE 256
#define ROMCOPYRIGHT 272
#define ROMDOMESTIC 288
#define ROMWORLD 336
#define ROMTYPE 384
#define ROMPRODUCT 386
#define ROMCHECKSUM 398
#define ROMIOSUPPORT 400
#define ROMROMSTART 416
#define ROMROMEND 420
#define ROMRAMINFO 424
#define ROMRAMSTART 436
#define ROMRAMEND 440
#define ROMMODEMINFO 444
#define ROMMEMO 456
#define ROMCOUNTRY 496
#define P3BUTTONS 1
#define P6BUTTONS 2
#define PKEYBOARD 4
#define PPRINTER 8
#define PBALL 16
#define PFLOPPY 32
#define PACTIVATOR 64
#define PTEAMPLAYER 128
#define PMSYSTEMPAD 256
#define PSERIAL 512
#define PTABLET 1024
#define PPADDLE 2048
#define PCDROM 4096
#define PMOUSE 8192
#define MAXCOMPANY 64
#define MAXPERIPHERALS 14
typedef struct
{
char companyid[6];
char company[26];
} COMPANYINFO;
typedef struct
{
char pID[2];
char pName[14];
} PERIPHERALINFO;
ROMINFO rominfo;
char rom_filename[256];
/***************************************************************************
* Genesis ROM Manufacturers
*
* Based on the document provided at
* http://www.zophar.net/tech/files/Genesis_ROM_Format.txt
**************************************************************************/
static const COMPANYINFO companyinfo[MAXCOMPANY] =
{
{"ACLD", "Ballistic"},
{"RSI", "Razorsoft"},
{"SEGA", "SEGA"},
{"TREC", "Treco"},
{"VRGN", "Virgin Games"},
{"WSTN", "Westone"},
{"10", "Takara"},
{"11", "Taito or Accolade"},
{"12", "Capcom"},
{"13", "Data East"},
{"14", "Namco or Tengen"},
{"15", "Sunsoft"},
{"16", "Bandai"},
{"17", "Dempa"},
{"18", "Technosoft"},
{"19", "Technosoft"},
{"20", "Asmik"},
{"22", "Micronet"},
{"23", "Vic Tokai"},
{"24", "American Sammy"},
{"29", "Kyugo"},
{"32", "Wolfteam"},
{"33", "Kaneko"},
{"35", "Toaplan"},
{"36", "Tecmo"},
{"40", "Toaplan"},
{"42", "UFL Company Limited"},
{"43", "Human"},
{"45", "Game Arts"},
{"47", "Sage's Creation"},
{"48", "Tengen"},
{"49", "Renovation or Telenet"},
{"50", "Electronic Arts"},
{"56", "Razorsoft"},
{"58", "Mentrix"},
{"60", "Victor Musical Ind."},
{"69", "Arena"},
{"70", "Virgin"},
{"73", "Soft Vision"},
{"74", "Palsoft"},
{"76", "Koei"},
{"79", "U.S. Gold"},
{"81", "Acclaim/Flying Edge"},
{"83", "Gametek"},
{"86", "Absolute"},
{"87", "Mindscape"},
{"93", "Sony"},
{"95", "Konami"},
{"97", "Tradewest"},
{"100", "T*HQ Software"},
{"101", "Tecmagik"},
{"112", "Designer Software"},
{"113", "Psygnosis"},
{"119", "Accolade"},
{"120", "Code Masters"},
{"125", "Interplay"},
{"130", "Activision"},
{"132", "Shiny & Playmates"},
{"144", "Atlus"},
{"151", "Infogrames"},
{"161", "Fox Interactive"},
{"177", "Ubisoft"},
{"239", "Disney Interactive"},
{"---", "Unknown"}
};
/***************************************************************************
* Genesis Peripheral Information
*
* Based on the document provided at
* http://www.zophar.net/tech/files/Genesis_ROM_Format.txt
***************************************************************************/
static const PERIPHERALINFO peripheralinfo[MAXPERIPHERALS] =
{
{"J", "3B Joypad"},
{"6", "6B Joypad"},
{"K", "Keyboard"},
{"P", "Printer"},
{"B", "Control Ball"},
{"F", "Floppy Drive"},
{"L", "Activator"},
{"4", "Team Player"},
{"0", "MS Joypad"},
{"R", "RS232C Serial"},
{"T", "Tablet"},
{"V", "Paddle"},
{"C", "CD-ROM"},
{"M", "Mega Mouse"},
};
/***************************************************************************
*
* Compute ROM real checksum.
***************************************************************************/
static uint16 getchecksum(uint8 *rom, int length)
{
int i;
uint16 checksum = 0;
for (i = 0; i < length; i += 2)
{
checksum += ((rom[i] << 8) + rom[i + 1]);
}
return checksum;
}
/***************************************************************************
*
* Pass a pointer to the ROM base address.
***************************************************************************/
static void getrominfo(char *romheader)
{
uint16 offset = 0;
/* Clear ROM info structure */
memset (&rominfo, 0, sizeof (ROMINFO));
/* Look for Master System ROM header */
if (!memcmp (&cart.rom[0x1ff0], "TMR SEGA", 8))
{
offset = 0x1ff0;
}
else if (!memcmp (&cart.rom[0x3ff0], "TMR SEGA", 8))
{
offset = 0x3ff0;
}
else if (!memcmp (&cart.rom[0x7ff0], "TMR SEGA", 8))
{
offset = 0x7ff0;
}
/* If found, assume this is a SMS game */
if (offset)
{
/* force SMS compatibilty mode */
system_hw = SYSTEM_PBC;
/* checksum */
rominfo.checksum = cart.rom[offset + 0x0a] | (cart.rom[offset + 0x0b] << 8);
/* product code & version */
sprintf(&rominfo.product[0], "%02d", cart.rom[offset + 0x0e] >> 4);
sprintf(&rominfo.product[2], "%02x", cart.rom[offset + 0x0d]);
sprintf(&rominfo.product[4], "%02x", cart.rom[offset + 0x0c]);
sprintf(&rominfo.product[6], "-%d", cart.rom[offset + 0x0e] & 0x0F);
/* region code */
switch (cart.rom[offset + 0x0f] >> 4)
{
case 3:
strcpy(rominfo.country,"SMS Japan");
break;
case 4:
strcpy(rominfo.country,"SMS Export");
break;
case 5:
strcpy(rominfo.country,"GG Japan");
break;
case 6:
strcpy(rominfo.country,"GG Export");
break;
case 7:
strcpy(rominfo.country,"GG International");
break;
default:
sprintf(rominfo.country,"Unknown (%d)", cart.rom[offset + 0x0f] >> 4);
break;
}
/* ROM size */
rominfo.romstart = 0;
switch (cart.rom[offset + 0x0f] & 0x0F)
{
case 0x00:
rominfo.romend = 0x3FFFF;
break;
case 0x01:
rominfo.romend = 0x7FFFF;
break;
case 0x02:
rominfo.romend = 0xFFFFF;
break;
case 0x0a:
rominfo.romend = 0x1FFF;
break;
case 0x0b:
rominfo.romend = 0x3FFF;
break;
case 0x0c:
rominfo.romend = 0x7FFF;
break;
case 0x0d:
rominfo.romend = 0xBFFF;
break;
case 0x0e:
rominfo.romend = 0xFFFF;
break;
case 0x0f:
rominfo.romend = 0x1FFFF;
break;
}
}
else
{
/* Some SMS games don't have any header */
if (system_hw == SYSTEM_PBC) return;
/* Genesis ROM header support */
memcpy (&rominfo.consoletype, romheader + ROMCONSOLE, 16);
memcpy (&rominfo.copyright, romheader + ROMCOPYRIGHT, 16);
/* Domestic (japanese) name */
rominfo.domestic[0] = romheader[ROMDOMESTIC];
int i, j = 1;
for (i=1; i<48; i++)
{
if ((rominfo.domestic[j-1] != 32) || (romheader[ROMDOMESTIC + i] != 32))
{
rominfo.domestic[j] = romheader[ROMDOMESTIC + i];
j++;
}
}
rominfo.domestic[j] = 0;
/* International name */
rominfo.international[0] = romheader[ROMWORLD];
j=1;
for (i=1; i<48; i++)
{
if ((rominfo.international[j-1] != 32) || (romheader[ROMWORLD + i] != 32))
{
rominfo.international[j] = romheader[ROMWORLD + i];
j++;
}
}
rominfo.international[j] = 0;
/* ROM informations */
memcpy (&rominfo.ROMType, romheader + ROMTYPE, 2);
memcpy (&rominfo.product, romheader + ROMPRODUCT, 12);
memcpy (&rominfo.checksum, romheader + ROMCHECKSUM, 2);
memcpy (&rominfo.romstart, romheader + ROMROMSTART, 4);
memcpy (&rominfo.romend, romheader + ROMROMEND, 4);
memcpy (&rominfo.country, romheader + ROMCOUNTRY, 16);
/* Checksums */
#ifdef LSB_FIRST
rominfo.checksum = (rominfo.checksum >> 8) | ((rominfo.checksum & 0xff) << 8);
#endif
rominfo.realchecksum = getchecksum(((uint8 *) cart.rom) + 0x200, cart.romsize - 0x200);
/* Supported peripherals */
rominfo.peripherals = 0;
for (i = 0; i < 14; i++)
for (j=0; j < 14; j++)
if (romheader[ROMIOSUPPORT+i] == peripheralinfo[j].pID[0])
rominfo.peripherals |= (1 << j);
}
}
/***************************************************************************
* deinterleave_block
*
* Convert interleaved (.smd) ROM files.
***************************************************************************/
static void deinterleave_block(uint8 * src)
{
int i;
uint8 block[0x4000];
memcpy (block, src, 0x4000);
for (i = 0; i < 0x2000; i += 1)
{
src[i * 2 + 0] = block[0x2000 + (i)];
src[i * 2 + 1] = block[0x0000 + (i)];
}
}
/***************************************************************************
* load_rom
*
* Load a new ROM file.
***************************************************************************/
int load_rom(char *filename)
{
int i, size;
#ifdef NGC
size = cart.romsize;
#else
uint8 *ptr;
ptr = load_archive(filename, &size);
if(!ptr) return (0);
memcpy(cart.rom, ptr, size);
free(ptr);
#endif
/* Minimal ROM size */
if (size < 0x4000)
{
memset(cart.rom + size, 0xFF, 0x4000 - size);
size = 0x4000;
}
/* Get file extension */
if (!strnicmp(".sms", &filename[strlen(filename) - 4], 4))
{
/* Force SMS compatibility mode */
system_hw = SYSTEM_PBC;
}
else
{
/* Assume Genesis mode */
system_hw = SYSTEM_GENESIS;
}
/* Take care of 512 byte header, if present */
if (strncmp((char *)(cart.rom + 0x100),"SEGA", 4) && ((size / 512) & 1))
{
size -= 512;
memcpy (cart.rom, cart.rom + 512, size);
/* interleaved ROM format (.smd) */
if (system_hw != SYSTEM_PBC)
{
for (i = 0; i < (size / 0x4000); i++)
{
deinterleave_block (cart.rom + (i * 0x4000));
}
}
}
/* max. 10 MBytes supported */
if (size > MAXROMSIZE) size = MAXROMSIZE;
cart.romsize = size;
/* clear unused ROM space */
memset(cart.rom + size, 0xff, MAXROMSIZE - size);
/* get infos from ROM header */
getrominfo((char *)cart.rom);
/* detect console region */
region_autodetect();
/* Genesis ROM specific */
if (system_hw != SYSTEM_PBC)
{
#ifdef LSB_FIRST
/* Byteswap ROM */
uint8 temp;
for(i = 0; i < size; i += 2)
{
temp = cart.rom[i];
cart.rom[i] = cart.rom[i+1];
cart.rom[i+1] = temp;
}
#endif
/* byteswapped RADICA dumps (from Haze) */
if (((strstr(rominfo.product,"-K0101") != NULL) && (rominfo.checksum == 0xf424)) ||
((strstr(rominfo.product,"-K0109") != NULL) && (rominfo.checksum == 0x4f10)))
{
uint8 temp;
for(i = 0; i < size; i += 2)
{
temp = cart.rom[i];
cart.rom[i] = cart.rom[i+1];
cart.rom[i+1] = temp;
}
}
/* PICO hardware */
if (strstr(rominfo.consoletype, "SEGA PICO") != NULL)
{
system_hw = SYSTEM_PICO;
}
}
return(1);
}
/****************************************************************************
* region_autodetect
*
* Set console region upon ROM header
*
****************************************************************************/
void region_autodetect(void)
{
if (system_hw == SYSTEM_PBC)
{
region_code = sms_cart_region_detect();
}
else
{
/* country codes used to differentiate region */
/* 0001 = japan ntsc (1) */
/* 0010 = japan pal (2) */
/* 0100 = usa (4) */
/* 1000 = europe (8) */
int country = 0;
int i = 0;
char c;
/* from Gens */
if (!strnicmp(rominfo.country, "eur", 3)) country |= 8;
else if (!strnicmp(rominfo.country, "usa", 3)) country |= 4;
else if (!strnicmp(rominfo.country, "jap", 3)) country |= 1;
else
{
/* look for each characters */
for(i = 0; i < 4; i++)
{
c = toupper((int)rominfo.country[i]);
if (c == 'U') country |= 4;
else if (c == 'J') country |= 1;
else if (c == 'E') country |= 8;
else if (c == 'K') country |= 1;
else if (c < 16) country |= c;
else if ((c >= '0') && (c <= '9')) country |= c - '0';
else if ((c >= 'A') && (c <= 'F')) country |= c - 'A' + 10;
}
}
/* set default console region (USA > JAPAN > EUROPE) */
if (country & 4) region_code = REGION_USA;
else if (country & 1) region_code = REGION_JAPAN_NTSC;
else if (country & 8) region_code = REGION_EUROPE;
else if (country & 2) region_code = REGION_JAPAN_PAL;
else region_code = REGION_USA;
/* some games need specific REGION setting */
if (((strstr(rominfo.product,"T-45033") != NULL) && (rominfo.checksum == 0x0F81)) || /* Alisia Dragon (Europe) */
(strstr(rominfo.product,"T-69046-50") != NULL) || /* Back to the Future III (Europe) */
(strstr(rominfo.product,"T-120106-00") != NULL) || /* Brian Lara Cricket (Europe) */
(strstr(rominfo.product,"T-70096 -00") != NULL)) /* Muhammad Ali Heavyweight Boxing (Europe) */
{
/* need PAL settings */
region_code = REGION_EUROPE;
}
if ((rominfo.realchecksum == 0x532e) && (strstr(rominfo.product,"1011-00") != NULL))
{
/* On Dal Jang Goon (Korea) needs JAPAN region code */
region_code = REGION_JAPAN_NTSC;
}
}
/* forced console region */
if (config.region_detect == 1) region_code = REGION_USA;
else if (config.region_detect == 2) region_code = REGION_EUROPE;
else if (config.region_detect == 3) region_code = REGION_JAPAN_NTSC;
else if (config.region_detect == 4) region_code = REGION_JAPAN_PAL;
/* PAL/NTSC timings */
vdp_pal = (region_code & REGION_JAPAN_PAL) >> 6;
}
/****************************************************************************
* get_company (Softdev - 2006)
*
* Try to determine which company made this rom
*
* Ok, for some reason there's no standard for this.
* It seems that there can be pretty much anything you like following the
* copyright (C) symbol!
****************************************************************************/
char *get_company(void)
{
char *s;
int i;
char company[10];
for (i = 3; i < 8; i++)
{
company[i - 3] = rominfo.copyright[i];
}
company[5] = 0;
/** OK, first look for a hyphen
* Capcom use T-12 for example
*/
s = strstr (company, "-");
if (s != NULL)
{
s++;
strcpy (company, s);
}
/** Strip any trailing spaces **/
for (i = strlen (company) - 1; i >= 0; i--)
if (company[i] == 32)
company[i] = 0;
if (strlen (company) == 0)
return (char *)companyinfo[MAXCOMPANY - 1].company;
for (i = 0; i < MAXCOMPANY - 1; i++)
{
if (!(strncmp (company, companyinfo[i].companyid, strlen (company))))
return (char *)companyinfo[i].company;
}
return (char *)companyinfo[MAXCOMPANY - 1].company;
}
/****************************************************************************
* get_peripheral (Softdev - 2006)
*
* Return peripheral name based on header code
*
****************************************************************************/
char *get_peripheral(int index)
{
if (index < MAXPERIPHERALS)
return (char *)peripheralinfo[index].pName;
return (char *)companyinfo[MAXCOMPANY - 1].company;
}
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