1228 lines
35 KiB
C
1228 lines
35 KiB
C
/***************************************************************************************
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* Genesis Plus
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* ROM Loading Support
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*
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* Copyright (C) 1998-2003 Charles Mac Donald (original code)
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* Copyright (C) 2007-2023 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************************/
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#include <ctype.h>
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#include "shared.h"
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/*** ROM Information ***/
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#define ROMCONSOLE 256
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#define ROMCOPYRIGHT 272
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#define ROMDOMESTIC 288
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#define ROMWORLD 336
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#define ROMTYPE 384
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#define ROMPRODUCT 386
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#define ROMCHECKSUM 398
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#define ROMIOSUPPORT 400
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#define ROMROMSTART 416
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#define ROMROMEND 420
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#define ROMRAMINFO 424
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#define ROMRAMSTART 436
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#define ROMRAMEND 440
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#define ROMMODEMINFO 444
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#define ROMMEMO 456
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#define ROMCOUNTRY 496
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#define P3BUTTONS 0x0001
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#define P6BUTTONS 0x0002
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#define PKEYBOARD 0x0004
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#define PPRINTER 0x0008
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#define PBALL 0x0010
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#define PFLOPPY 0x0020
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#define PACTIVATOR 0x0040
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#define PTEAMPLAYER 0x0080
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#define PMSYSTEMPAD 0x0100
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#define PSERIAL 0x0200
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#define PTABLET 0x0400
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#define PPADDLE 0x0800
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#define PCDROM 0x1000
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#define PMOUSE 0x2000
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#define PMENACER 0x4000
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#define MAXCOMPANY 64
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#define MAXPERIPHERALS 15
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typedef struct
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{
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char companyid[6];
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char company[26];
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} COMPANYINFO;
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typedef struct
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{
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char pID[2];
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char pName[14];
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} PERIPHERALINFO;
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ROMINFO rominfo;
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uint8 romtype;
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static uint8 rom_region;
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/***************************************************************************
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* Genesis ROM Manufacturers
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*
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* Based on the document provided at
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* http://www.zophar.net/tech/files/Genesis_ROM_Format.txt
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**************************************************************************/
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static const COMPANYINFO companyinfo[MAXCOMPANY] =
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{
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{"ACLD", "Ballistic"},
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{"RSI", "Razorsoft"},
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{"SEGA", "SEGA"},
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{"TREC", "Treco"},
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{"VRGN", "Virgin Games"},
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{"WSTN", "Westone"},
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{"10", "Takara"},
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{"11", "Taito or Accolade"},
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{"12", "Capcom"},
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{"13", "Data East"},
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{"14", "Namco or Tengen"},
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{"15", "Sunsoft"},
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{"16", "Bandai"},
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{"17", "Dempa"},
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{"18", "Technosoft"},
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{"19", "Technosoft"},
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{"20", "Asmik"},
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{"22", "Micronet"},
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{"23", "Vic Tokai"},
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{"24", "American Sammy"},
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{"29", "Kyugo"},
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{"32", "Wolfteam"},
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{"33", "Kaneko"},
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{"35", "Toaplan"},
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{"36", "Tecmo"},
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{"40", "Toaplan"},
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{"42", "UFL Company Limited"},
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{"43", "Human"},
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{"45", "Game Arts"},
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{"47", "Sage's Creation"},
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{"48", "Tengen"},
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{"49", "Renovation or Telenet"},
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{"50", "Electronic Arts"},
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{"56", "Razorsoft"},
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{"58", "Mentrix"},
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{"60", "Victor Musical Ind."},
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{"69", "Arena"},
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{"70", "Virgin"},
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{"73", "Soft Vision"},
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{"74", "Palsoft"},
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{"76", "Koei"},
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{"79", "U.S. Gold"},
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{"81", "Acclaim/Flying Edge"},
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{"83", "Gametek"},
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{"86", "Absolute"},
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{"87", "Mindscape"},
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{"93", "Sony"},
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{"95", "Konami"},
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{"97", "Tradewest"},
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{"100", "T*HQ Software"},
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{"101", "Tecmagik"},
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{"112", "Designer Software"},
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{"113", "Psygnosis"},
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{"119", "Accolade"},
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{"120", "Code Masters"},
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{"125", "Interplay"},
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{"130", "Activision"},
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{"132", "Shiny & Playmates"},
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{"144", "Atlus"},
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{"151", "Infogrames"},
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{"161", "Fox Interactive"},
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{"177", "Ubisoft"},
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{"239", "Disney Interactive"},
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{"---", "Unknown"}
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};
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/***************************************************************************
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* Genesis Peripheral Information
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*
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* Based on the document provided at
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* http://www.zophar.net/tech/files/Genesis_ROM_Format.txt
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***************************************************************************/
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static const PERIPHERALINFO peripheralinfo[MAXPERIPHERALS] =
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{
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{"J", "3B Joypad"},
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{"6", "6B Joypad"},
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{"K", "Keyboard"},
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{"P", "Printer"},
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{"B", "Control Ball"},
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{"F", "Floppy Drive"},
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{"L", "Activator"},
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{"4", "Team Player"},
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{"0", "MS Joypad"},
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{"R", "RS232C Serial"},
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{"T", "Tablet"},
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{"V", "Paddle"},
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{"C", "CD-ROM"},
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{"M", "Mega Mouse"},
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{"G", "Menacer"},
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};
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/***************************************************************************
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*
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* Compute ROM real checksum.
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***************************************************************************/
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static uint16 getchecksum(uint8 *rom, int length)
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{
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int i;
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uint16 checksum = 0;
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for (i = 0; i < length; i += 2)
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{
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checksum += ((rom[i] << 8) + rom[i + 1]);
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}
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return checksum;
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}
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/***************************************************************************
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* deinterleave_block
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*
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* Convert interleaved (.smd) ROM files.
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***************************************************************************/
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static void deinterleave_block(uint8 * src)
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{
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int i;
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uint8 block[0x4000];
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memcpy (block, src, 0x4000);
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for (i = 0; i < 0x2000; i += 1)
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{
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src[i * 2 + 0] = block[0x2000 + (i)];
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src[i * 2 + 1] = block[0x0000 + (i)];
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}
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}
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/***************************************************************************
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*
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* Pass a pointer to the ROM base address.
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***************************************************************************/
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void getrominfo(char *romheader)
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{
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/* Clear ROM info structure */
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memset (&rominfo, 0, sizeof (ROMINFO));
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/* Genesis ROM header support */
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if (system_hw & SYSTEM_MD)
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{
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int i,j;
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memcpy (&rominfo.consoletype, romheader + ROMCONSOLE, 16);
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memcpy (&rominfo.copyright, romheader + ROMCOPYRIGHT, 16);
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/* Domestic (japanese) name */
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rominfo.domestic[0] = romheader[ROMDOMESTIC];
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j = 1;
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for (i=1; i<48; i++)
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{
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if ((rominfo.domestic[j-1] != 32) || (romheader[ROMDOMESTIC + i] != 32))
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{
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rominfo.domestic[j] = romheader[ROMDOMESTIC + i];
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j++;
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}
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}
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rominfo.domestic[j] = 0;
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/* International name */
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rominfo.international[0] = romheader[ROMWORLD];
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j=1;
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for (i=1; i<48; i++)
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{
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if ((rominfo.international[j-1] != 32) || (romheader[ROMWORLD + i] != 32))
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{
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rominfo.international[j] = romheader[ROMWORLD + i];
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j++;
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}
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}
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rominfo.international[j] = 0;
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/* ROM informations */
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memcpy (&rominfo.ROMType, romheader + ROMTYPE, 2);
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memcpy (&rominfo.product, romheader + ROMPRODUCT, 12);
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memcpy (&rominfo.checksum, romheader + ROMCHECKSUM, 2);
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memcpy (&rominfo.romstart, romheader + ROMROMSTART, 4);
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memcpy (&rominfo.romend, romheader + ROMROMEND, 4);
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memcpy (&rominfo.country, romheader + ROMCOUNTRY, 16);
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/* Checksums */
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#ifdef LSB_FIRST
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rominfo.checksum = (rominfo.checksum >> 8) | ((rominfo.checksum & 0xff) << 8);
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#endif
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rominfo.realchecksum = getchecksum(((uint8 *) cart.rom) + 0x200, cart.romsize - 0x200);
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/* Supported peripherals */
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rominfo.peripherals = 0;
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for (i = 0; i < 14; i++)
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for (j=0; j < MAXPERIPHERALS; j++)
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if (romheader[ROMIOSUPPORT+i] == peripheralinfo[j].pID[0])
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rominfo.peripherals |= (1 << j);
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}
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else
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{
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uint16 offset = 0;
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/* detect Master System ROM header */
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if (!memcmp (&romheader[0x1ff0], "TMR SEGA", 8))
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{
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offset = 0x1ff0;
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}
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else if (!memcmp (&romheader[0x3ff0], "TMR SEGA", 8))
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{
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offset = 0x3ff0;
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}
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else if (!memcmp (&romheader[0x7ff0], "TMR SEGA", 8))
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{
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offset = 0x7ff0;
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}
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/* if found, get infos from header */
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if ((offset > 0) && (offset < cart.romsize))
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{
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/* checksum */
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rominfo.checksum = romheader[offset + 0x0a] | (romheader[offset + 0x0b] << 8);
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/* product code & version */
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sprintf(&rominfo.product[0], "%02d", romheader[offset + 0x0e] >> 4);
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sprintf(&rominfo.product[2], "%02x", romheader[offset + 0x0d]);
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sprintf(&rominfo.product[4], "%02x", romheader[offset + 0x0c]);
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sprintf(&rominfo.product[6], "-%d", romheader[offset + 0x0e] & 0x0F);
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/* region code */
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switch (romheader[offset + 0x0f] >> 4)
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{
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case 3:
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strcpy(rominfo.country,"SMS Japan");
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break;
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case 4:
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strcpy(rominfo.country,"SMS Export");
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break;
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case 5:
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strcpy(rominfo.country,"GG Japan");
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break;
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case 6:
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strcpy(rominfo.country,"GG Export");
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break;
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case 7:
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strcpy(rominfo.country,"GG International");
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break;
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default:
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sprintf(rominfo.country,"Unknown (%d)", romheader[offset + 0x0f] >> 4);
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break;
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}
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/* ROM size */
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rominfo.romstart = 0;
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switch (romheader[offset + 0x0f] & 0x0F)
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{
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case 0x00:
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rominfo.romend = 0x3FFFF;
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break;
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case 0x01:
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rominfo.romend = 0x7FFFF;
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break;
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case 0x02:
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rominfo.romend = 0xFFFFF;
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break;
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case 0x0a:
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rominfo.romend = 0x1FFF;
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break;
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case 0x0b:
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rominfo.romend = 0x3FFF;
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break;
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case 0x0c:
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rominfo.romend = 0x7FFF;
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break;
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case 0x0d:
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rominfo.romend = 0xBFFF;
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break;
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case 0x0e:
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rominfo.romend = 0xFFFF;
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break;
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case 0x0f:
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rominfo.romend = 0x1FFFF;
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break;
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}
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}
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}
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}
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/***************************************************************************
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* load_bios
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*
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* Load current system BIOS file.
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*
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* Return loaded size (-1 if already loaded)
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*
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***************************************************************************/
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int load_bios(int system)
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{
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int size = 0;
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switch (system)
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{
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case SYSTEM_MCD:
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{
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/* check if CD BOOTROM is already loaded */
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if (!(system_bios & 0x10) || ((system_bios & 0x0c) != (region_code >> 4)))
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{
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/* load CD BOOTROM (fixed 128KB size) */
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switch (region_code)
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{
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case REGION_USA:
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size = load_archive(CD_BIOS_US, scd.bootrom, sizeof(scd.bootrom), 0);
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break;
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case REGION_EUROPE:
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size = load_archive(CD_BIOS_EU, scd.bootrom, sizeof(scd.bootrom), 0);
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break;
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default:
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size = load_archive(CD_BIOS_JP, scd.bootrom, sizeof(scd.bootrom), 0);
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break;
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}
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/* CD BOOTROM loaded ? */
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if (size > 0)
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{
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/* auto-detect CD hardware model */
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if (!memcmp(&scd.bootrom[0x120], "WONDER-MEGA BOOT", 16))
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{
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/* Wondermega CD hardware */
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scd.type = CD_TYPE_WONDERMEGA;
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}
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else if (!memcmp(&scd.bootrom[0x120], "WONDERMEGA2 BOOT", 16))
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{
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/* Wondermega M2 / X'Eye CD hardware */
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scd.type = CD_TYPE_WONDERMEGA_M2;
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}
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else if (!memcmp(&scd.bootrom[0x120], "CDX BOOT ROM ", 16))
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{
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/* CDX / Multi-Mega CD hardware */
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scd.type = CD_TYPE_CDX;
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}
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else
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{
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/* default CD hardware */
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scd.type = CD_TYPE_DEFAULT;
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}
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#ifdef LSB_FIRST
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/* Byteswap ROM to optimize 16-bit access */
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int i;
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for (i = 0; i < size; i += 2)
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{
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uint8 temp = scd.bootrom[i];
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scd.bootrom[i] = scd.bootrom[i+1];
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scd.bootrom[i+1] = temp;
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}
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#endif
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/* mark CD BIOS as being loaded */
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system_bios = system_bios | 0x10;
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/* loaded BIOS region */
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system_bios = (system_bios & 0xf0) | (region_code >> 4);
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}
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return size;
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}
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return -1;
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}
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case SYSTEM_GG:
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case SYSTEM_GGMS:
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{
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/* check if Game Gear BOOTROM is already loaded */
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if (!(system_bios & SYSTEM_GG))
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{
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/* mark both Master System & Game Gear BOOTROM as unloaded */
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system_bios &= ~(SYSTEM_SMS | SYSTEM_GG);
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/* BOOTROM is stored above cartridge ROM area (max. 4MB) */
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if (cart.romsize <= 0x400000)
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{
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/* load Game Gear BOOTROM file */
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size = load_archive(GG_BIOS, cart.rom + 0x400000, 0x400000, 0);
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if (size > 0)
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{
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/* mark Game Gear BOOTROM as loaded */
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system_bios |= SYSTEM_GG;
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}
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}
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return size;
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}
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return -1;
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}
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case SYSTEM_SMS:
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case SYSTEM_SMS2:
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{
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/* check if Master System BOOTROM is already loaded */
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if (!(system_bios & SYSTEM_SMS) || ((system_bios & 0x0c) != (region_code >> 4)))
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{
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/* mark both Master System & Game Gear BOOTROM as unloaded */
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system_bios &= ~(SYSTEM_SMS | SYSTEM_GG);
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/* BOOTROM is stored above cartridge ROM area (max. 4MB) */
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if (cart.romsize <= 0x400000)
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{
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/* load Master System BOOTROM file */
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switch (region_code)
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{
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case REGION_USA:
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size = load_archive(MS_BIOS_US, cart.rom + 0x400000, 0x400000, 0);
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break;
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case REGION_EUROPE:
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size = load_archive(MS_BIOS_EU, cart.rom + 0x400000, 0x400000, 0);
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break;
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default:
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size = load_archive(MS_BIOS_JP, cart.rom + 0x400000, 0x400000, 0);
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break;
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}
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if (size > 0)
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{
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/* mark Master System BOOTROM as loaded */
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system_bios |= SYSTEM_SMS;
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/* loaded BOOTROM region */
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system_bios = (system_bios & 0xf0) | (region_code >> 4);
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}
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}
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return size;
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}
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return -1;
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}
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default:
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{
|
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/* mark all BOOTROM as unloaded */
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|
system_bios &= ~(0x10 | SYSTEM_SMS | SYSTEM_GG);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/***************************************************************************
|
|
* load_rom
|
|
*
|
|
* Load a new ROM file.
|
|
*
|
|
* Return 0 on error, 1 on success
|
|
*
|
|
***************************************************************************/
|
|
int load_rom(char *filename)
|
|
{
|
|
int i, size;
|
|
|
|
#ifdef USE_DYNAMIC_ALLOC
|
|
if (!ext)
|
|
{
|
|
/* allocate & initialize memory for Cartridge / CD hardware if required */
|
|
ext = (external_t *)calloc(1, sizeof(external_t));
|
|
if (!ext) return (0);
|
|
}
|
|
#endif
|
|
|
|
/* clear any existing patches */
|
|
ggenie_shutdown();
|
|
areplay_shutdown();
|
|
|
|
/* check previous loaded ROM size */
|
|
if (cart.romsize > 0x800000)
|
|
{
|
|
/* assume no CD is currently loaded */
|
|
cdd.loaded = 0;
|
|
}
|
|
|
|
/* auto-detect CD image file */
|
|
size = cdd_load(filename, (char *)(cart.rom));
|
|
if (size < 0)
|
|
{
|
|
/* error opening file */
|
|
return (0);
|
|
}
|
|
|
|
/* CD image file ? */
|
|
if (size)
|
|
{
|
|
/* enable CD hardware */
|
|
system_hw = SYSTEM_MCD;
|
|
}
|
|
else
|
|
{
|
|
/* load file into ROM buffer */
|
|
char extension[4];
|
|
size = load_archive(filename, cart.rom, cdd.loaded ? 0x800000 : MAXROMSIZE, extension);
|
|
|
|
/* mark BOOTROM as unloaded if they have been overwritten by cartridge ROM */
|
|
if (size > 0x800000)
|
|
{
|
|
/* CD BIOS ROM are loaded at the start of CD area */
|
|
system_bios &= ~0x10;
|
|
}
|
|
else if (size > 0x400000)
|
|
{
|
|
/* Master System or Game Gear BIOS ROM are loaded within $400000-$4FFFFF area */
|
|
system_bios &= ~(SYSTEM_SMS | SYSTEM_GG);
|
|
}
|
|
else if (size <= 0)
|
|
{
|
|
/* mark all BOOTROM as unloaded since they could have been overwritten */
|
|
system_bios &= ~(0x10 | SYSTEM_SMS | SYSTEM_GG);
|
|
|
|
/* error loading file */
|
|
return 0;
|
|
}
|
|
|
|
/* convert lower case file extension to upper case */
|
|
*(uint32 *)(extension) &= 0xdfdfdfdf;
|
|
|
|
/* auto-detect system hardware from ROM file extension */
|
|
if (!memcmp("SMS", &extension[0], 3))
|
|
{
|
|
/* Master System II hardware */
|
|
system_hw = SYSTEM_SMS2;
|
|
}
|
|
else if (!memcmp("GG", &extension[1], 2))
|
|
{
|
|
/* Game Gear hardware (GG mode) */
|
|
system_hw = SYSTEM_GG;
|
|
}
|
|
else if (!memcmp("SG", &extension[1], 2))
|
|
{
|
|
/* SG-1000 hardware */
|
|
system_hw = SYSTEM_SG;
|
|
}
|
|
else
|
|
{
|
|
/* default is Mega Drive / Genesis hardware (16-bit mode) */
|
|
system_hw = SYSTEM_MD;
|
|
|
|
/* decode .MDX format */
|
|
if (!memcmp("MDX", &extension[0], 3))
|
|
{
|
|
for (i = 4; i < size - 1; i++)
|
|
{
|
|
cart.rom[i-4] = cart.rom[i] ^ 0x40;
|
|
}
|
|
size = size - 5;
|
|
}
|
|
|
|
/* auto-detect byte-swapped dumps */
|
|
if (!memcmp((char *)(cart.rom + 0x100),"ESAGM GE ARDVI E", 16) ||
|
|
!memcmp((char *)(cart.rom + 0x100),"ESAGG NESESI", 12) ||
|
|
!memcmp((char *)(cart.rom + 0x80000 + 0x100),"ESAGM GE ARDVI E", 16) ||
|
|
!memcmp((char *)(cart.rom + 0x80000 + 0x100),"ESAGG NESESI", 12))
|
|
{
|
|
for(i = 0; i < size; i += 2)
|
|
{
|
|
uint8 temp = cart.rom[i];
|
|
cart.rom[i] = cart.rom[i+1];
|
|
cart.rom[i+1] = temp;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* auto-detect 512 byte extra header */
|
|
if (memcmp((char *)(cart.rom + 0x100), "SEGA", 4) && ((size / 512) & 1) && !(size % 512))
|
|
{
|
|
/* remove header */
|
|
size -= 512;
|
|
memmove (cart.rom, cart.rom + 512, size);
|
|
|
|
/* assume interleaved Mega Drive / Genesis ROM format (.smd) */
|
|
if (system_hw == SYSTEM_MD)
|
|
{
|
|
for (i = 0; i < (size / 0x4000); i++)
|
|
{
|
|
deinterleave_block (cart.rom + (i * 0x4000));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* initialize ROM size */
|
|
cart.romsize = size;
|
|
|
|
/* get infos from ROM header */
|
|
getrominfo((char *)(cart.rom));
|
|
|
|
/* set console region */
|
|
get_region((char *)(cart.rom));
|
|
|
|
#ifdef LSB_FIRST
|
|
/* 16-bit ROM specific */
|
|
if (system_hw == SYSTEM_MD)
|
|
{
|
|
/* Byteswap ROM to optimize 16-bit access */
|
|
for (i = 0; i < cart.romsize; i += 2)
|
|
{
|
|
uint8 temp = cart.rom[i];
|
|
cart.rom[i] = cart.rom[i+1];
|
|
cart.rom[i+1] = temp;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* PICO ROM */
|
|
if (strstr(rominfo.consoletype, "SEGA PICO") != NULL)
|
|
{
|
|
/* PICO hardware */
|
|
system_hw = SYSTEM_PICO;
|
|
}
|
|
|
|
/* Save auto-detected system hardware */
|
|
romtype = system_hw;
|
|
|
|
/* CD image file */
|
|
if (system_hw == SYSTEM_MCD)
|
|
{
|
|
/* try to load CD BOOTROM for selected region */
|
|
if (!load_bios(SYSTEM_MCD))
|
|
{
|
|
/* unmount CD image */
|
|
cdd_unload();
|
|
|
|
/* error booting from CD */
|
|
return (0);
|
|
}
|
|
|
|
/* boot from CD hardware */
|
|
scd.cartridge.boot = 0x00;
|
|
}
|
|
|
|
/* 16-bit ROM cartridge (max. 8MB) with optional CD hardware add-on support enabled */
|
|
else if ((system_hw == SYSTEM_MD) && (cart.romsize <= 0x800000) && (config.add_on != HW_ADDON_NONE))
|
|
{
|
|
int len;
|
|
char fname[256];
|
|
|
|
#if defined(USE_LIBCHDR)
|
|
/* automatically try to load associated .chd file if no .cue file CD image loaded yet */
|
|
if (!cdd.loaded)
|
|
{
|
|
len = strlen(filename);
|
|
while ((len && (filename[len] != '.')) || (len > 251)) len--;
|
|
strncpy(fname, filename, len);
|
|
strcpy(&fname[len], ".chd");
|
|
fname[len+4] = 0;
|
|
cdd_load(fname, (char *)cdc.ram);
|
|
}
|
|
#endif
|
|
|
|
/* automatically enable CD hardware emulation (Mode 1) in case : */
|
|
/* - loaded ROM has known CD hardware support */
|
|
/* or */
|
|
/* - CD hardware emulation is forced on */
|
|
/* or */
|
|
/* - MegaSD add-on emulation is disabled and normal CD image file is loaded */
|
|
if ((rominfo.peripherals & PCDROM) || (strstr(rominfo.domestic,"FLUX") != NULL) ||
|
|
(config.add_on == HW_ADDON_MEGACD) || ((config.add_on | cdd.loaded) == HW_ADDON_MEGACD))
|
|
{
|
|
/* try to load CD BOOTROM for selected region */
|
|
if (load_bios(SYSTEM_MCD))
|
|
{
|
|
/* automatically try to load associated .iso file if no CD image loaded yet */
|
|
if (!cdd.loaded)
|
|
{
|
|
len = strlen(filename);
|
|
while ((len && (filename[len] != '.')) || (len > 251)) len--;
|
|
strncpy(fname, filename, len);
|
|
strcpy(&fname[len], ".iso");
|
|
fname[len+4] = 0;
|
|
cdd_load(fname, (char *)cdc.ram);
|
|
}
|
|
|
|
/* enable CD hardware */
|
|
system_hw = SYSTEM_MCD;
|
|
|
|
/* boot from cartridge */
|
|
scd.cartridge.boot = 0x40;
|
|
}
|
|
else
|
|
{
|
|
/* unmount any loaded CD image */
|
|
cdd_unload();
|
|
}
|
|
}
|
|
|
|
/* CD BOOTROM */
|
|
else if (strstr(rominfo.ROMType, "BR") != NULL)
|
|
{
|
|
/* enable CD hardware */
|
|
system_hw = SYSTEM_MCD;
|
|
|
|
/* auto-detect CD hardware model */
|
|
if (strstr(rominfo.domestic, "WONDER-MEGA BOOT"))
|
|
{
|
|
/* Wondermega CD hardware */
|
|
scd.type = CD_TYPE_WONDERMEGA;
|
|
}
|
|
else if (strstr(rominfo.domestic, "WONDERMEGA2 BOOT"))
|
|
{
|
|
/* Wondermega M2 / X'Eye CD hardware */
|
|
scd.type = CD_TYPE_WONDERMEGA_M2;
|
|
}
|
|
else if (strstr(rominfo.domestic, "CDX BOOT ROM"))
|
|
{
|
|
/* CDX / Multi-Mega CD hardware */
|
|
scd.type = CD_TYPE_CDX;
|
|
}
|
|
else
|
|
{
|
|
/* default CD hardware */
|
|
scd.type = CD_TYPE_DEFAULT;
|
|
}
|
|
|
|
/* boot from CD hardware */
|
|
scd.cartridge.boot = 0x00;
|
|
|
|
/* copy ROM to BOOTROM area */
|
|
memcpy(scd.bootrom, cart.rom, sizeof(scd.bootrom));
|
|
|
|
/* mark CD BIOS as being loaded */
|
|
system_bios = system_bios | 0x10;
|
|
|
|
/* loaded CD BIOS region */
|
|
system_bios = (system_bios & 0xf0) | (region_code >> 4);
|
|
}
|
|
}
|
|
|
|
/* Force system hardware if requested */
|
|
if (config.system == SYSTEM_MD)
|
|
{
|
|
if (!(system_hw & SYSTEM_MD))
|
|
{
|
|
/* Mega Drive in MS compatibility mode */
|
|
system_hw = SYSTEM_PBC;
|
|
}
|
|
}
|
|
else if (config.system == SYSTEM_GG)
|
|
{
|
|
if (system_hw != SYSTEM_GG)
|
|
{
|
|
/* Game Gear in MS compatibility mode */
|
|
system_hw = SYSTEM_GGMS;
|
|
}
|
|
}
|
|
else if (config.system)
|
|
{
|
|
system_hw = config.system;
|
|
}
|
|
|
|
/* 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 settings */
|
|
input.x_offset = (input.system[1] == SYSTEM_MENACER) ? 64 : 0;
|
|
input.y_offset = 0;
|
|
|
|
/* autodetect gun support */
|
|
if (strstr(rominfo.international,"MENACER") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1)
|
|
{
|
|
old_system[0] = input.system[0];
|
|
}
|
|
if (old_system[1] == -1)
|
|
{
|
|
old_system[1] = input.system[1];
|
|
}
|
|
|
|
/* force MENACER configuration */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 82;
|
|
input.y_offset = 0;
|
|
}
|
|
else if (strstr(rominfo.international,"T2 ; THE ARCADE GAME") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1)
|
|
{
|
|
old_system[0] = input.system[0];
|
|
}
|
|
if (old_system[1] == -1)
|
|
{
|
|
old_system[1] = input.system[1];
|
|
}
|
|
|
|
/* force MENACER configuration */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 133;
|
|
input.y_offset = -8;
|
|
}
|
|
else if (strstr(rominfo.international,"BODY COUNT") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1)
|
|
{
|
|
old_system[0] = input.system[0];
|
|
}
|
|
if (old_system[1] == -1)
|
|
{
|
|
old_system[1] = input.system[1];
|
|
}
|
|
|
|
/* force MENACER configuration */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 68;
|
|
input.y_offset = -24;
|
|
}
|
|
else if (strstr(rominfo.international,"CORPSE KILLER") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1)
|
|
{
|
|
old_system[0] = input.system[0];
|
|
}
|
|
if (old_system[1] == -1)
|
|
{
|
|
old_system[1] = input.system[1];
|
|
}
|
|
|
|
/* force MENACER configuration */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 64;
|
|
input.y_offset = -8;
|
|
}
|
|
else if (strstr(rominfo.international,"CRIME PATROL") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1)
|
|
{
|
|
old_system[0] = input.system[0];
|
|
}
|
|
if (old_system[1] == -1)
|
|
{
|
|
old_system[1] = input.system[1];
|
|
}
|
|
|
|
/* force MENACER configuration */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 61;
|
|
input.y_offset = 0;
|
|
}
|
|
else if (strstr(rominfo.international,"MAD DOG II THE LOST GOLD") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1)
|
|
{
|
|
old_system[0] = input.system[0];
|
|
}
|
|
if (old_system[1] == -1)
|
|
{
|
|
old_system[1] = input.system[1];
|
|
}
|
|
|
|
/* force MENACER configuration */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 70;
|
|
input.y_offset = 18;
|
|
}
|
|
else if (strstr(rominfo.international,"MAD DOG MCCREE") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1)
|
|
{
|
|
old_system[0] = input.system[0];
|
|
}
|
|
if (old_system[1] == -1)
|
|
{
|
|
old_system[1] = input.system[1];
|
|
}
|
|
|
|
/* force MENACER configuration */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 49;
|
|
input.y_offset = 0;
|
|
}
|
|
else if (strstr(rominfo.international,"WHO SHOT JOHNNY ROCK?") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1)
|
|
{
|
|
old_system[0] = input.system[0];
|
|
}
|
|
if (old_system[1] == -1)
|
|
{
|
|
old_system[1] = input.system[1];
|
|
}
|
|
|
|
/* force MENACER configuration */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 60;
|
|
input.y_offset = 30;
|
|
}
|
|
else if ((strstr(rominfo.international,"LETHAL ENFORCERS") != NULL) ||
|
|
(strstr(rominfo.international,"SNATCHER") != NULL))
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1)
|
|
{
|
|
old_system[0] = input.system[0];
|
|
}
|
|
if (old_system[1] == -1)
|
|
{
|
|
old_system[1] = input.system[1];
|
|
}
|
|
|
|
/* force JUSTIFIER configuration */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_JUSTIFIER;
|
|
input.x_offset = (strstr(rominfo.international,"GUN FIGHTERS") != NULL) ? 24 : 0;
|
|
input.y_offset = 0;
|
|
}
|
|
|
|
return(1);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* get_region
|
|
*
|
|
* Set console region from ROM header passed as parameter or
|
|
* from previous auto-detection (if NULL)
|
|
*
|
|
****************************************************************************/
|
|
void get_region(char *romheader)
|
|
{
|
|
/* region auto-detection ? */
|
|
if (romheader)
|
|
{
|
|
/* Mega CD image */
|
|
if (system_hw == SYSTEM_MCD)
|
|
{
|
|
/* security code */
|
|
switch ((unsigned char)romheader[0x20b])
|
|
{
|
|
case 0x64:
|
|
region_code = REGION_EUROPE;
|
|
break;
|
|
|
|
case 0xa1:
|
|
region_code = REGION_JAPAN_NTSC;
|
|
break;
|
|
|
|
default:
|
|
region_code = REGION_USA;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* 16-bit cartridge */
|
|
else if (system_hw & SYSTEM_MD)
|
|
{
|
|
/* country codes used to differentiate region */
|
|
/* 0001 = japan ntsc (1) */
|
|
/* 0010 = japan pal (2) -> does not exist ? */
|
|
/* 0100 = usa (4) */
|
|
/* 1000 = europe (8) */
|
|
int country = 0;
|
|
|
|
/* from Gens */
|
|
if (!memcmp(rominfo.country, "eur", 3)) country |= 8;
|
|
else if (!memcmp(rominfo.country, "EUR", 3)) country |= 8;
|
|
else if (!memcmp(rominfo.country, "Europe", 3)) country |= 8;
|
|
else if (!memcmp(rominfo.country, "jap", 3)) country |= 1;
|
|
else if (!memcmp(rominfo.country, "JAP", 3)) country |= 1;
|
|
else if (!memcmp(rominfo.country, "usa", 3)) country |= 4;
|
|
else if (!memcmp(rominfo.country, "USA", 3)) country |= 4;
|
|
else
|
|
{
|
|
int i;
|
|
char c;
|
|
|
|
/* 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 settings but have wrong header*/
|
|
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-97126 -50") != NULL) || /* Williams Arcade's Greatest Hits (Europe) */
|
|
(strstr(rominfo.product,"T-113026-50") != NULL) || /* Wiz'n'Liz - The Frantic Wabbit Wescue (Europe) */
|
|
(strstr(rominfo.product,"T-70096 -00") != NULL) || /* Muhammad Ali Heavyweight Boxing (Europe) */
|
|
((rominfo.checksum == 0x0000) && (rominfo.realchecksum == 0x1f7f))) /* Radica - Sensible Soccer Plus edition */
|
|
{
|
|
/* need PAL settings */
|
|
region_code = REGION_EUROPE;
|
|
}
|
|
else if ((rominfo.realchecksum == 0x532e) && (strstr(rominfo.product,"1011-00") != NULL))
|
|
{
|
|
/* On Dal Jang Goon (Korea) needs JAPAN region code */
|
|
region_code = REGION_JAPAN_NTSC;
|
|
}
|
|
}
|
|
|
|
/* 8-bit cartridge */
|
|
else
|
|
{
|
|
region_code = sms_cart_region_detect();
|
|
}
|
|
|
|
/* save auto-detected region */
|
|
rom_region = region_code;
|
|
}
|
|
else
|
|
{
|
|
/* restore auto-detected region */
|
|
region_code = rom_region;
|
|
}
|
|
|
|
/* force console region if requested */
|
|
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;
|
|
|
|
/* autodetect PAL/NTSC timings */
|
|
vdp_pal = (region_code >> 6) & 0x01;
|
|
|
|
/* autodetect PAL/NTSC master clock */
|
|
system_clock = vdp_pal ? MCLOCK_PAL : MCLOCK_NTSC;
|
|
|
|
/* force PAL/NTSC timings if requested */
|
|
if (config.vdp_mode == 1) vdp_pal = 0;
|
|
else if (config.vdp_mode == 2) vdp_pal = 1;
|
|
|
|
/* force PAL/NTSC master clock if requested */
|
|
if (config.master_clock == 1) system_clock = MCLOCK_NTSC;
|
|
else if (config.master_clock == 2) system_clock = MCLOCK_PAL;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* 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;
|
|
}
|
|
|