mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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453 lines
12 KiB
C
453 lines
12 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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* Eke-Eke (2007,2008,2009), additional code & fixes for the GCN/Wii port
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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****************************************************************************************/
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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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uint16 peripherals;
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uint16 realchecksum;
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ROMINFO rominfo;
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char rom_filename[256];
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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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COMPANYINFO companyinfo[MAXCOMPANY] = {
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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 Industries"},
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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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PERIPHERALINFO peripheralinfo[14] = {
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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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* softdev - New Checksum Calculation
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eke-eke: fixed
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*/
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static uint16 GetRealChecksum (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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* getrominfo
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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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int i,j;
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memset (&rominfo, 0, sizeof (ROMINFO));
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memcpy (&rominfo.consoletype, romheader + ROMCONSOLE, 16);
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memcpy (&rominfo.copyright, romheader + ROMCOPYRIGHT, 16);
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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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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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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.io_support, romheader + ROMIOSUPPORT, 16);
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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.RAMInfo, romheader + ROMRAMINFO, 12);
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memcpy (&rominfo.ramstart, romheader + ROMRAMSTART, 4);
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memcpy (&rominfo.ramend, romheader + ROMRAMEND, 4);
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memcpy (&rominfo.modem, romheader + ROMMODEMINFO, 12);
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memcpy (&rominfo.memo, romheader + ROMMEMO, 40);
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memcpy (&rominfo.country, romheader + ROMCOUNTRY, 16);
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realchecksum = GetRealChecksum (((uint8 *) cart.rom) + 0x200, cart.romsize - 0x200);
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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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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 (rominfo.io_support[i] == peripheralinfo[j].pID[0])
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peripherals |= (1 << j);
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}
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/* SMD (interleaved) rom support */
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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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int load_rom(char *filename)
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{
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int i, size, offset = 0;
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#ifdef NGC
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size = cart.romsize;
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sprintf(rom_filename,"%s",filename);
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rom_filename[strlen(rom_filename) - 4] = 0;
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#else
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uint8 *ptr;
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ptr = load_archive(filename, &size);
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if(!ptr) return (0);
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memcpy(cart.rom, ptr + offset, size);
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free(ptr);
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#endif
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/* detect interleaved format (.SMD) */
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if (strncmp((char *)(cart.rom + 0x100),"SEGA", 4) && ((size / 512) & 1))
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{
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size -= 512;
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offset += 512;
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for (i = 0; i < (size / 0x4000); i += 1)
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{
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deinterleave_block (cart.rom + offset + (i * 0x4000));
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}
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memcpy(cart.rom, cart.rom + offset, size);
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}
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/* max. 10 MBytes supported */
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if (size > MAXROMSIZE) size = MAXROMSIZE;
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cart.romsize = size;
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/* clear unused ROM space */
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memset (cart.rom + size, 0xff, MAXROMSIZE - size);
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/* get infos from ROM header */
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getrominfo((char *)cart.rom);
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/* set system region */
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set_region();
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#ifdef LSB_FIRST
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/* Byteswap ROM */
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uint8 temp;
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for(i = 0; i < size; i += 2)
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{
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temp = cart.rom[i];
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cart.rom[i] = cart.rom[i+1];
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cart.rom[i+1] = temp;
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}
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#endif
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/* byteswapped RADICA dumps (from Haze) */
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if (((strstr(rominfo.product,"-K0101") != NULL) && (rominfo.checksum == 0xf424)) ||
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((strstr(rominfo.product,"-K0109") != NULL) && (rominfo.checksum == 0x4f10)))
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{
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uint8 temp;
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for(i = 0; i < size; i += 2)
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{
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temp = cart.rom[i];
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cart.rom[i] = cart.rom[i+1];
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cart.rom[i+1] = temp;
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}
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}
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/* console hardware */
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if (strstr(rominfo.consoletype, "SEGA PICO") != NULL)
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system_hw = SYSTEM_PICO;
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else if (strstr(rominfo.consoletype, "SEGA MEGADRIVE") != NULL)
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system_hw = SYSTEM_MEGADRIVE;
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else
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system_hw = SYSTEM_GENESIS;
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return(1);
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}
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/* 05/05/2006: new region detection routine (taken from GENS sourcecode) */
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void set_region ()
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{
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/* country codes used to differentiate region */
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/* 0001 = japan ntsc (1) */
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/* 0010 = japan pal (2) */
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/* 0100 = usa (4) */
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/* 1000 = europe (8) */
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int country = 0;
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int i = 0;
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char c;
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/* reading header to find the country */
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if (!strnicmp(rominfo.country, "eur", 3)) country |= 8;
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else if (!strnicmp(rominfo.country, "usa", 3)) country |= 4;
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else if (!strnicmp(rominfo.country, "jap", 3)) country |= 1;
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else for(i = 0; i < 4; i++)
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{
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c = toupper((int)rominfo.country[i]);
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if (c == 'U') country |= 4;
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else if (c == 'J') country |= 1;
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else if (c == 'E') country |= 8;
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else if (c == 'K') country |= 1;
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else if (c < 16) country |= c;
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else if ((c >= '0') && (c <= '9')) country |= c - '0';
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else if ((c >= 'A') && (c <= 'F')) country |= c - 'A' + 10;
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}
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/* automatic detection */
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/* setting region */
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/* this is used by IO register */
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if (country & 4) region_code = REGION_USA;
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else if (country & 1) region_code = REGION_JAPAN_NTSC;
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else if (country & 8) region_code = REGION_EUROPE;
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else if (country & 2) region_code = REGION_JAPAN_PAL;
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else region_code = REGION_USA;
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/* some games need specific REGION setting */
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if (((strstr(rominfo.product,"T-45033") != NULL) && (rominfo.checksum == 0x0F81)) || /* Alisia Dragon (PAL) */
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(strstr(rominfo.product,"T-69046-50") != NULL) || /* Back to the Future III (PAL) */
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(strstr(rominfo.product,"T-120106-00") != NULL) || /* Brian Lara Cricket (PAL) */
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(strstr(rominfo.product,"T-70096 -00") != NULL)) /* Muhammad Ali Heavyweight Boxing (PAL) */
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{
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/* need PAL settings */
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region_code = REGION_EUROPE;
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}
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else if ((realchecksum == 0x532e) && (strstr(rominfo.product,"1011-00") != NULL))
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{
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/* On Dal Jang Goon (Korea) needs JAP region code */
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region_code = REGION_JAPAN_NTSC;
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}
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/* Force region setting */
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if (config.region_detect == 1)
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region_code = REGION_USA;
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else if (config.region_detect == 2)
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region_code = REGION_EUROPE;
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else if (config.region_detect == 3)
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region_code = REGION_JAPAN_NTSC;
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else if (config.region_detect == 4)
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region_code = REGION_JAPAN_PAL;
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/* Set VDP default mode */
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switch (region_code)
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{
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case REGION_EUROPE:
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case REGION_JAPAN_PAL:
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vdp_pal = 1;
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break;
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default:
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vdp_pal = 0;
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break;
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}
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}
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/****************************************************************************
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* getcompany
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*
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* Try to determine which company made this rom
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*
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* Ok, for some reason there's no standard for this.
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* It seems that there can be pretty much anything you like following the
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* copyright (C) symbol!
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****************************************************************************/
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int getcompany ()
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{
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char *s;
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int i;
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char company[10];
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for (i = 3; i < 8; i++) company[i - 3] = rominfo.copyright[i];
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company[5] = 0;
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/** OK, first look for a hyphen
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* Capcom use T-12 for example
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*/
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s = strstr (company, "-");
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if (s != NULL)
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{
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s++;
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strcpy (company, s);
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}
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/** Strip any trailing spaces **/
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for (i = strlen (company) - 1; i >= 0; i--)
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if (company[i] == 32) company[i] = 0;
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if (strlen (company) == 0) return MAXCOMPANY - 1;
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for (i = 0; i < MAXCOMPANY - 1; i++)
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{
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if (!(strncmp (company, companyinfo[i].companyid, strlen (company)))) return i;
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}
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return MAXCOMPANY - 1;
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}
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