mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-09-10 16:53:15 +02:00
610 lines
17 KiB
C
610 lines
17 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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#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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/***************************************************************************
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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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uint16 offset = 0;
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/* Clear ROM info structure */
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memset (&rominfo, 0, sizeof (ROMINFO));
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/* Look for Master System ROM header */
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if (!memcmp (&cart.rom[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 (&cart.rom[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 (&cart.rom[0x7ff0], "TMR SEGA", 8))
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{
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offset = 0x7ff0;
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}
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/* If found, assume this is a SMS game */
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if (offset)
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{
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/* force SMS compatibilty mode */
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system_hw = SYSTEM_PBC;
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/* checksum */
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rominfo.checksum = cart.rom[offset + 0x0a] | (cart.rom[offset + 0x0b] << 8);
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/* product code & version */
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sprintf(&rominfo.product[0], "%02d", cart.rom[offset + 0x0e] >> 4);
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sprintf(&rominfo.product[2], "%02x", cart.rom[offset + 0x0d]);
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sprintf(&rominfo.product[4], "%02x", cart.rom[offset + 0x0c]);
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sprintf(&rominfo.product[6], "-%d", cart.rom[offset + 0x0e] & 0x0F);
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/* region code */
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switch (cart.rom[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)", cart.rom[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 (cart.rom[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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else
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{
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/* Some SMS games don't have any header */
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if (system_hw == SYSTEM_PBC) return;
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/* Genesis ROM header support */
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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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int i, 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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}
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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_rom
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*
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* Load a new ROM file.
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***************************************************************************/
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int load_rom(char *filename)
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{
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int i, size;
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#ifdef NGC
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size = cart.romsize;
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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, size);
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free(ptr);
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#endif
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/* Minimal ROM size */
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if (size < 0x4000)
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{
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memset(cart.rom + size, 0xFF, 0x4000 - size);
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size = 0x4000;
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}
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/* Get file extension */
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if (!strnicmp(".sms", &filename[strlen(filename) - 4], 4))
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{
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/* Force SMS compatibility mode */
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system_hw = SYSTEM_PBC;
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}
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else
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{
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/* Assume Genesis mode */
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system_hw = SYSTEM_GENESIS;
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}
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/* Take care of 512 byte header, if present */
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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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memcpy (cart.rom, cart.rom + 512, size);
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/* interleaved ROM format (.smd) */
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if (system_hw != SYSTEM_PBC)
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{
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for (i = 0; i < (size / 0x4000); i++)
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{
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deinterleave_block (cart.rom + (i * 0x4000));
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}
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}
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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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/* detect console region */
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region_autodetect();
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/* Genesis ROM specific */
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if (system_hw != SYSTEM_PBC)
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{
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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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{
|
||
|
temp = cart.rom[i];
|
||
|
cart.rom[i] = cart.rom[i+1];
|
||
|
cart.rom[i+1] = temp;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* PICO hardware */
|
||
|
if (strstr(rominfo.consoletype, "SEGA PICO") != NULL)
|
||
|
{
|
||
|
system_hw = SYSTEM_PICO;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return(1);
|
||
|
}
|
||
|
|
||
|
/****************************************************************************
|
||
|
* region_autodetect
|
||
|
*
|
||
|
* Set console region upon ROM header
|
||
|
*
|
||
|
****************************************************************************/
|
||
|
void region_autodetect(void)
|
||
|
{
|
||
|
if (system_hw == SYSTEM_PBC)
|
||
|
{
|
||
|
region_code = sms_cart_region_detect();
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
/* country codes used to differentiate region */
|
||
|
/* 0001 = japan ntsc (1) */
|
||
|
/* 0010 = japan pal (2) */
|
||
|
/* 0100 = usa (4) */
|
||
|
/* 1000 = europe (8) */
|
||
|
int country = 0;
|
||
|
int i = 0;
|
||
|
char c;
|
||
|
|
||
|
/* from Gens */
|
||
|
if (!strnicmp(rominfo.country, "eur", 3)) country |= 8;
|
||
|
else if (!strnicmp(rominfo.country, "usa", 3)) country |= 4;
|
||
|
else if (!strnicmp(rominfo.country, "jap", 3)) country |= 1;
|
||
|
else
|
||
|
{
|
||
|
/* look for each characters */
|
||
|
for(i = 0; i < 4; i++)
|
||
|
{
|
||
|
c = toupper((int)rominfo.country[i]);
|
||
|
|
||
|
if (c == 'U') country |= 4;
|
||
|
else if (c == 'J') country |= 1;
|
||
|
else if (c == 'E') country |= 8;
|
||
|
else if (c == 'K') country |= 1;
|
||
|
else if (c < 16) country |= c;
|
||
|
else if ((c >= '0') && (c <= '9')) country |= c - '0';
|
||
|
else if ((c >= 'A') && (c <= 'F')) country |= c - 'A' + 10;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* set default console region (USA > JAPAN > EUROPE) */
|
||
|
if (country & 4) region_code = REGION_USA;
|
||
|
else if (country & 1) region_code = REGION_JAPAN_NTSC;
|
||
|
else if (country & 8) region_code = REGION_EUROPE;
|
||
|
else if (country & 2) region_code = REGION_JAPAN_PAL;
|
||
|
else region_code = REGION_USA;
|
||
|
|
||
|
/* some games need specific REGION setting */
|
||
|
if (((strstr(rominfo.product,"T-45033") != NULL) && (rominfo.checksum == 0x0F81)) || /* Alisia Dragon (Europe) */
|
||
|
(strstr(rominfo.product,"T-69046-50") != NULL) || /* Back to the Future III (Europe) */
|
||
|
(strstr(rominfo.product,"T-120106-00") != NULL) || /* Brian Lara Cricket (Europe) */
|
||
|
(strstr(rominfo.product,"T-70096 -00") != NULL)) /* Muhammad Ali Heavyweight Boxing (Europe) */
|
||
|
{
|
||
|
/* need PAL settings */
|
||
|
region_code = REGION_EUROPE;
|
||
|
}
|
||
|
|
||
|
if ((rominfo.realchecksum == 0x532e) && (strstr(rominfo.product,"1011-00") != NULL))
|
||
|
{
|
||
|
/* On Dal Jang Goon (Korea) needs JAPAN region code */
|
||
|
region_code = REGION_JAPAN_NTSC;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* forced console region */
|
||
|
if (config.region_detect == 1) region_code = REGION_USA;
|
||
|
else if (config.region_detect == 2) region_code = REGION_EUROPE;
|
||
|
else if (config.region_detect == 3) region_code = REGION_JAPAN_NTSC;
|
||
|
else if (config.region_detect == 4) region_code = REGION_JAPAN_PAL;
|
||
|
|
||
|
/* PAL/NTSC timings */
|
||
|
vdp_pal = (region_code & REGION_JAPAN_PAL) >> 6;
|
||
|
}
|
||
|
|
||
|
|
||
|
/****************************************************************************
|
||
|
* get_company (Softdev - 2006)
|
||
|
*
|
||
|
* Try to determine which company made this rom
|
||
|
*
|
||
|
* Ok, for some reason there's no standard for this.
|
||
|
* It seems that there can be pretty much anything you like following the
|
||
|
* copyright (C) symbol!
|
||
|
****************************************************************************/
|
||
|
char *get_company(void)
|
||
|
{
|
||
|
char *s;
|
||
|
int i;
|
||
|
char company[10];
|
||
|
|
||
|
for (i = 3; i < 8; i++)
|
||
|
{
|
||
|
company[i - 3] = rominfo.copyright[i];
|
||
|
}
|
||
|
company[5] = 0;
|
||
|
|
||
|
/** OK, first look for a hyphen
|
||
|
* Capcom use T-12 for example
|
||
|
*/
|
||
|
s = strstr (company, "-");
|
||
|
if (s != NULL)
|
||
|
{
|
||
|
s++;
|
||
|
strcpy (company, s);
|
||
|
}
|
||
|
|
||
|
/** Strip any trailing spaces **/
|
||
|
for (i = strlen (company) - 1; i >= 0; i--)
|
||
|
if (company[i] == 32)
|
||
|
company[i] = 0;
|
||
|
|
||
|
if (strlen (company) == 0)
|
||
|
return (char *)companyinfo[MAXCOMPANY - 1].company;
|
||
|
|
||
|
for (i = 0; i < MAXCOMPANY - 1; i++)
|
||
|
{
|
||
|
if (!(strncmp (company, companyinfo[i].companyid, strlen (company))))
|
||
|
return (char *)companyinfo[i].company;
|
||
|
}
|
||
|
|
||
|
return (char *)companyinfo[MAXCOMPANY - 1].company;
|
||
|
}
|
||
|
|
||
|
/****************************************************************************
|
||
|
* get_peripheral (Softdev - 2006)
|
||
|
*
|
||
|
* Return peripheral name based on header code
|
||
|
*
|
||
|
****************************************************************************/
|
||
|
char *get_peripheral(int index)
|
||
|
{
|
||
|
if (index < MAXPERIPHERALS)
|
||
|
return (char *)peripheralinfo[index].pName;
|
||
|
return (char *)companyinfo[MAXCOMPANY - 1].company;
|
||
|
}
|
||
|
|