mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-29 20:51:49 +01:00
28775cc3aa
---------- * added Mega CD / Sega CD hardware emulation (incl. Sub 68K, CDD, CDC, PCM, GFX rotation/scaling, etc) * added .ISO & .BIN CD image file support * added 512K backup cartridge RAM support * added savestate support for CD games NOTES: ~~~~~~ * to play CD games, original BIOS ROM files are required in /genplus/bios/ directory: unzip & rename them to bios_CD_U.bin, bios_CD_E.bin, bios_CD_J.bin * CD audio tracks (CD-DA) are not supported (yet) [Core/CPU] ---------- * modified 68k core for Mega CD / Sega CD support [Core/VDP] --------------- * improved DMA accuracy * added support for 8-bit VRAM writes with undocumented code value (verified on real hardware by Nemesis) [Gamecube/Wii] --------------- * modified Master System & Game Gear "BIOS" support (files should be named bios_U.sms, bios_J.sms, bios_E.sms & bios.gg and copied to /genplus/bios directory). * replaced "Hard Reset" button by a Soft Reset for systems having a Reset button (Mega Drive / Genesis & Master System) * State & SRAM files are now only compressed when saving to Gamecube Memory Cards * various fixes & cleanup. [Core/SCD] ---------- * added Mega CD / Sega CD hardware emulation (incl. Sub 68K, CDD, CDC, PCM, GFX rotation/scaling, etc) * added .ISO & .BIN CD image file support * added 512K backup cartridge RAM support * added savestate support for CD games NOTES: ~~~~~~ * to play CD games, original BIOS ROM files are required in /genplus/bios/ directory: unzip & rename them to bios_CD_U.bin, bios_CD_E.bin, bios_CD_J.bin * CD audio tracks (CD-DA) are not supported (yet) [Core/CPU] ---------- * modified 68k core for Mega CD / Sega CD support [Core/VDP] --------------- * improved DMA accuracy * added support for 8-bit VRAM writes with undocumented code value (verified on real hardware by Nemesis) [Gamecube/Wii] --------------- * modified Master System & Game Gear "BIOS" support (files should be named bios_U.sms, bios_J.sms, bios_E.sms & bios.gg and copied to /genplus/bios directory). * replaced "Hard Reset" button by a Soft Reset for systems having a Reset button (Mega Drive / Genesis & Master System) * State & SRAM files are now only compressed when saving to Gamecube Memory Cards * various fixes & cleanup.
967 lines
26 KiB
C
967 lines
26 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, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
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* Copyright (C) 2007-2012 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 1
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#define P6BUTTONS 2
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#define PKEYBOARD 4
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#define PPRINTER 8
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#define PBALL 16
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#define PFLOPPY 32
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#define PACTIVATOR 64
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#define PTEAMPLAYER 128
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#define PMSYSTEMPAD 256
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#define PSERIAL 512
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#define PTABLET 1024
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#define PPADDLE 2048
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#define PCDROM 4096
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#define PMOUSE 8192
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#define MAXCOMPANY 64
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#define MAXPERIPHERALS 14
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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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char rom_filename[256];
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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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};
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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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*
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* Pass a pointer to the ROM base address.
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***************************************************************************/
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static 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 < 14; 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)
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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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* 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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* 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(void)
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{
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int size = 0;
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switch (system_hw)
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{
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case SYSTEM_MCD:
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{
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/* check if CD BOOT ROM 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 BOOT ROM */
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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));
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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));
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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));
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break;
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}
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/* CD BOOT ROM loaded ? */
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if (size > 0)
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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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else
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{
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/* CD BOOT ROM disabled (SYSTEM ERROR) */
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memset(scd.bootrom, 0xff, sizeof(scd.bootrom));
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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 "BIOS" is already loaded */
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if (!(system_bios & SYSTEM_GG))
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{
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/* mark Master System & Game Gear "BIOS" as unloaded */
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system_bios &= ~(SYSTEM_SMS | SYSTEM_GG);
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/* "BIOS" ROM is stored above cartridge ROM area, into $400000-$4FFFFF (max. 1MB) */
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if (cart.romsize <= 0x400000)
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{
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/* load Game Gear "BIOS" file */
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size = load_archive(GG_BIOS, cart.rom + 0x400000, 0x100000);
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if (size > 0)
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{
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/* mark Game Gear "BIOS" 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 "BIOS" 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 Master System & Game Gear "BIOS" as unloaded */
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system_bios &= ~(SYSTEM_SMS | SYSTEM_GG);
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/* "BIOS" ROM is stored above cartridge ROM area, into $400000-$4FFFFF (max. 1MB) */
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if (cart.romsize <= 0x400000)
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{
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/* load Master System "BIOS" 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, 0x100000);
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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, 0x100000);
|
|
break;
|
|
default:
|
|
size = load_archive(MS_BIOS_JP, cart.rom + 0x400000, 0x100000);
|
|
break;
|
|
}
|
|
|
|
if (size > 0)
|
|
{
|
|
/* mark Master System "BIOS" as loaded */
|
|
system_bios |= SYSTEM_SMS;
|
|
|
|
/* loaded "BIOS" region */
|
|
system_bios = (system_bios & 0xf0) | (region_code >> 4);
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
default:
|
|
{
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/***************************************************************************
|
|
* load_rom
|
|
*
|
|
* Load a new ROM file.
|
|
*
|
|
* Return 0 on error, 1 on success
|
|
*
|
|
***************************************************************************/
|
|
int load_rom(char *filename)
|
|
{
|
|
FILE *fd;
|
|
char buf[0x220];
|
|
int i;
|
|
|
|
/* default ROM header */
|
|
char *header = (char *)(cart.rom);
|
|
|
|
/* clear any existing patches */
|
|
ggenie_shutdown();
|
|
areplay_shutdown();
|
|
|
|
/* unload any existing disc */
|
|
if (romtype == SYSTEM_MCD)
|
|
{
|
|
cdd_unload();
|
|
}
|
|
|
|
/* .cue file support */
|
|
if (!strncmp(".cue", &filename[strlen(filename) - 4], 4))
|
|
{
|
|
/* open associated .bin file */
|
|
strncpy(&filename[strlen(filename) - 4], ".bin", 4);
|
|
}
|
|
|
|
/* file header */
|
|
fd = fopen(filename, "rb");
|
|
if (fd)
|
|
{
|
|
fread(buf, 0x220, 1, fd);
|
|
fclose(fd);
|
|
}
|
|
|
|
/* auto-detect CD image file */
|
|
if (!strncmp("SEGADISCSYSTEM", buf + 0x10, 14))
|
|
{
|
|
/* file header pointer (BIN format) */
|
|
header = buf + 0x10;
|
|
|
|
/* enable CD hardware */
|
|
system_hw = SYSTEM_MCD;
|
|
}
|
|
else if (!strncmp("SEGADISCSYSTEM", buf, 14))
|
|
{
|
|
/* file header pointer (ISO format) */
|
|
header = buf;
|
|
|
|
/* enable CD hardware */
|
|
system_hw = SYSTEM_MCD;
|
|
}
|
|
else
|
|
{
|
|
/* load file into ROM buffer (input filename is overwritten by uncompressed filename) */
|
|
int size = load_archive(filename, cart.rom, sizeof(cart.rom));
|
|
if (!size) return(0);
|
|
|
|
/* mark CD BIOS as unloaded */
|
|
system_bios &= ~0x10;
|
|
|
|
/* Auto-detect system hardware from ROM file extension */
|
|
if (!strncmp(".sms", &filename[strlen(filename) - 4], 4))
|
|
{
|
|
/* Master System II hardware */
|
|
system_hw = SYSTEM_SMS2;
|
|
}
|
|
else if (!strncmp(".gg", &filename[strlen(filename) - 3], 3))
|
|
{
|
|
/* Game Gear hardware (GG mode) */
|
|
system_hw = SYSTEM_GG;
|
|
}
|
|
else if (!strncmp(".sg", &filename[strlen(filename) - 3], 3))
|
|
{
|
|
/* SG-1000 hardware */
|
|
system_hw = SYSTEM_SG;
|
|
}
|
|
else
|
|
{
|
|
/* Mega Drive hardware (Genesis mode) */
|
|
system_hw = SYSTEM_MD;
|
|
|
|
/* Decode .MDX format */
|
|
if (!strncmp(".mdx", &filename[strlen(filename) - 4], 4))
|
|
{
|
|
for (i = 4; i < size - 1; i++)
|
|
{
|
|
cart.rom[i-4] = cart.rom[i] ^ 0x40;
|
|
}
|
|
size = size - 5;
|
|
}
|
|
}
|
|
|
|
/* auto-detect 512 byte extra header */
|
|
if (strncmp((char *)(cart.rom + 0x100),"SEGA", 4) && ((size / 512) & 1))
|
|
{
|
|
/* remove header */
|
|
size -= 512;
|
|
memcpy (cart.rom, cart.rom + 512, size);
|
|
|
|
/* interleaved 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(header);
|
|
|
|
/* set console region */
|
|
get_region(header);
|
|
|
|
/* CD image file */
|
|
if (system_hw == SYSTEM_MCD)
|
|
{
|
|
/* load CD BOOT ROM */
|
|
if (!load_bios()) return (0);
|
|
|
|
/* load CD image */
|
|
cdd_load(filename, header - buf);
|
|
|
|
/* boot from CD */
|
|
scd.cartridge.boot = 0x00;
|
|
}
|
|
|
|
/* 16-bit ROM specific */
|
|
else if (system_hw == SYSTEM_MD)
|
|
{
|
|
#ifdef LSB_FIRST
|
|
/* 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
|
|
|
|
/* byteswapped RADICA dumps (from Haze) */
|
|
if (((strstr(rominfo.product,"-K0101") != NULL) && (rominfo.checksum == 0xf424)) ||
|
|
((strstr(rominfo.product,"-K0109") != NULL) && (rominfo.checksum == 0x4f10)))
|
|
{
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* auto-detected system hardware */
|
|
romtype = system_hw;
|
|
|
|
/* PICO ROM */
|
|
if (strstr(rominfo.consoletype, "SEGA PICO") != NULL)
|
|
{
|
|
/* PICO hardware */
|
|
system_hw = SYSTEM_PICO;
|
|
}
|
|
|
|
/* CD BOOT ROM */
|
|
else if (strstr(rominfo.ROMType, "BR") != NULL)
|
|
{
|
|
/* enable CD hardware */
|
|
system_hw = SYSTEM_MCD;
|
|
|
|
/* mark CD BIOS as being loaded */
|
|
system_bios = system_bios | 0x10;
|
|
|
|
/* loaded CD BIOS region */
|
|
system_bios = (system_bios & 0xf0) | (region_code >> 4);
|
|
|
|
/* boot from CD */
|
|
scd.cartridge.boot = 0x00;
|
|
|
|
/* CD unloaded */
|
|
cdd.loaded = 0;
|
|
}
|
|
|
|
/* special ROM cartridges that use CD hardware */
|
|
else if ((strstr(rominfo.domestic,"FLUX") != NULL) || (strstr(rominfo.domestic,"WONDER LIBRARY") != NULL))
|
|
{
|
|
/* enable CD hardware */
|
|
system_hw = SYSTEM_MCD;
|
|
|
|
/* copy ROM to CD cartridge area */
|
|
memcpy(scd.cartridge.area, cart.rom, sizeof(scd.cartridge.area));
|
|
|
|
/* load CD BOOT ROM */
|
|
if (load_bios())
|
|
{
|
|
/* CD unloaded */
|
|
cdd.loaded = 0;
|
|
|
|
/* boot from cartridge */
|
|
scd.cartridge.boot = 0x40;
|
|
}
|
|
else
|
|
{
|
|
/* assume Mega Drive hardware */
|
|
system_hw = SYSTEM_MD;
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* Master System or Game Gear BIOS ROM are loaded within $400000-$4FFFFF area */
|
|
if ((cart.romsize > 0x400000) || (system_hw == SYSTEM_MCD))
|
|
{
|
|
/* Mark both BIOS as unloaded if loaded ROM is overwriting them */
|
|
system_bios &= ~(SYSTEM_SMS | SYSTEM_GG);
|
|
}
|
|
|
|
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 (romheader[0x20b])
|
|
{
|
|
case 0x7a:
|
|
region_code = REGION_USA;
|
|
break;
|
|
|
|
case 0x64:
|
|
region_code = REGION_EUROPE;
|
|
break;
|
|
|
|
default:
|
|
region_code = REGION_JAPAN_NTSC;
|
|
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 (!strncmp(rominfo.country, "eur", 3)) country |= 8;
|
|
else if (!strncmp(rominfo.country, "EUR", 3)) country |= 8;
|
|
else if (!strncmp(rominfo.country, "jap", 3)) country |= 1;
|
|
else if (!strncmp(rominfo.country, "JAP", 3)) country |= 1;
|
|
else if (!strncmp(rominfo.country, "usa", 3)) country |= 4;
|
|
else if (!strncmp(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-70096 -00") != NULL)) /* Muhammad Ali Heavyweight Boxing (Europe) */
|
|
{
|
|
/* 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;
|
|
}
|
|
|