mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-28 12:11:50 +01:00
5b888e725b
improved cartridge structure added Lock-ON hardware emulation (Sonic & Knuckles) added cartridge ROM mirroring support (required for Lock-ON emulation)
295 lines
8.5 KiB
C
295 lines
8.5 KiB
C
/***************************************************************************************
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* Genesis Plus
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* I/O Chip
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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 "shared.h"
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uint8 io_reg[0x10];
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uint8 region_code = REGION_USA;
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int old_system[2] = {-1,-1};
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static struct port_t
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{
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void (*data_w)(uint32 data);
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uint32 (*data_r)(void);
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} port[3];
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/*****************************************************************************
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* I/O chip functions *
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* *
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*****************************************************************************/
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void io_init(void)
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{
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/* restore previous setting */
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if (old_system[0] != -1) input.system[0] = old_system[0];
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if (old_system[1] != -1) input.system[1] = old_system[1];
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/* initialize default GUN settings */
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input.x_offset = 0x00;
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input.y_offset = 0x00;
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/**********************************************
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SEGA MENACER
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***********************************************/
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if (strstr(rominfo.international,"MENACER") != NULL)
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{
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/* save current setting */
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if (old_system[0] == -1) old_system[0] = input.system[0];
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if (old_system[1] == -1) old_system[1] = input.system[1];
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input.system[0] = NO_SYSTEM;
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input.system[1] = SYSTEM_MENACER;
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input.x_offset = 0x52;
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input.y_offset = 0x00;
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}
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else if (strstr(rominfo.international,"T2 ; THE ARCADE GAME") != NULL)
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{
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/* save current setting */
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if (old_system[0] == -1) old_system[0] = input.system[0];
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if (old_system[1] == -1) old_system[1] = input.system[1];
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input.system[0] = SYSTEM_GAMEPAD;
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input.system[1] = SYSTEM_MENACER;
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input.x_offset = 0x84;
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input.y_offset = 0x08;
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}
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else if (strstr(rominfo.international,"BODY COUNT") != NULL)
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{
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/* save current setting */
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if (old_system[0] == -1) old_system[0] = input.system[0];
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if (old_system[1] == -1) old_system[1] = input.system[1];
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input.system[0] = SYSTEM_MOUSE;
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input.system[1] = SYSTEM_MENACER;
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input.x_offset = 0x44;
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input.y_offset = 0x18;
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}
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/**********************************************
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KONAMI JUSTIFIER
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***********************************************/
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else if (strstr(rominfo.international,"LETHAL ENFORCERSII") != NULL)
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{
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/* save current setting */
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if (old_system[0] == -1) old_system[0] = input.system[0];
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if (old_system[1] == -1) old_system[1] = input.system[1];
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input.system[0] = SYSTEM_GAMEPAD;
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input.system[1] = SYSTEM_JUSTIFIER;
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input.x_offset = 0x18;
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input.y_offset = 0x00;
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}
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else if (strstr(rominfo.international,"LETHAL ENFORCERS") != NULL)
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{
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/* save current setting */
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if (old_system[0] == -1) old_system[0] = input.system[0];
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if (old_system[1] == -1) old_system[1] = input.system[1];
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input.system[0] = SYSTEM_GAMEPAD;
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input.system[1] = SYSTEM_JUSTIFIER;
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input.x_offset = 0x00;
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input.y_offset = 0x00;
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}
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/**********************************************
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J-CART
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***********************************************/
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if (cart.hw.jcart)
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{
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/* save current setting */
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if (old_system[0] == -1) old_system[0] = input.system[0];
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if (old_system[1] == -1) old_system[1] = input.system[1];
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/* set default settings */
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input.system[0] = SYSTEM_GAMEPAD;
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input.system[1] = SYSTEM_GAMEPAD;
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}
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/**********************************************
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Initialize IO Port handlers
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***********************************************/
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switch (input.system[0])
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{
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case SYSTEM_GAMEPAD:
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port[0].data_w = gamepad_1_write;
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port[0].data_r = gamepad_1_read;
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break;
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case SYSTEM_MOUSE:
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port[0].data_w = mouse_write;
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port[0].data_r = mouse_read;
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break;
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case SYSTEM_WAYPLAY:
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port[0].data_w = wayplay_1_write;
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port[0].data_r = wayplay_1_read;
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break;
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case SYSTEM_TEAMPLAYER:
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port[0].data_w = teamplayer_1_write;
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port[0].data_r = teamplayer_1_read;
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break;
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default:
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port[0].data_w = NULL;
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port[0].data_r = NULL;
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break;
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}
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switch (input.system[1])
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{
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case SYSTEM_GAMEPAD:
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port[1].data_w = gamepad_2_write;
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port[1].data_r = gamepad_2_read;
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break;
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case SYSTEM_MOUSE:
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port[1].data_w = mouse_write;
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port[1].data_r = mouse_read;
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break;
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case SYSTEM_MENACER:
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port[1].data_w = NULL;
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port[1].data_r = menacer_read;
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break;
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case SYSTEM_JUSTIFIER:
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port[1].data_w = NULL;
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port[1].data_r = justifier_read;
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break;
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case SYSTEM_WAYPLAY:
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port[1].data_w = wayplay_2_write;
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port[1].data_r = wayplay_2_read;
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break;
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case SYSTEM_TEAMPLAYER:
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port[1].data_w = teamplayer_2_write;
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port[1].data_r = teamplayer_2_read;
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break;
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default:
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port[1].data_w = NULL;
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port[1].data_r = NULL;
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break;
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}
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/* External Port (unconnected) */
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port[2].data_w = NULL;
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port[2].data_r = NULL;
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/* Initialize Input Devices */
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input_init();
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}
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void io_reset(void)
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{
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/* I/O register default settings */
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uint8 io_def[0x10] =
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{
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0xA0,
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0x7F, 0x7F, 0x7F,
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0x00, 0x00, 0x00,
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0xFF, 0x00, 0x00,
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0xFF, 0x00, 0x00,
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0xFB, 0x00, 0x00,
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};
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/* Reset I/O registers */
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memcpy (io_reg, io_def, 0x10);
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/* Reset Input Devices */
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input_reset();
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}
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void io_write(uint32 offset, uint32 value)
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{
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switch (offset)
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{
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case 0x01: /* Port A Data */
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case 0x02: /* Port B Data */
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case 0x03: /* Port C Data */
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io_reg[offset] = ((value & 0x80) | (value & io_reg[offset+3]));
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if(port[offset-1].data_w) port[offset-1].data_w(value);
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return;
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case 0x05: /* Port B Ctrl */
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if (((value & 0x7F) == 0x7F) &&
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((input.system[0] == SYSTEM_TEAMPLAYER) ||
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(input.system[1] == SYSTEM_TEAMPLAYER)))
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{
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/* autodetect 4-Way play ! */
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input.system[0] = SYSTEM_WAYPLAY;
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input.system[1] = SYSTEM_WAYPLAY;
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port[0].data_w = wayplay_1_write;
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port[0].data_r = wayplay_1_read;
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port[1].data_w = wayplay_2_write;
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port[1].data_r = wayplay_2_read;
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input_reset();
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}
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case 0x04: /* Port A Ctrl */
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case 0x06: /* Port C Ctrl */
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io_reg[offset] = value & 0xFF;
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io_reg[offset-3] = ((io_reg[offset-3] & 0x80) | (io_reg[offset-3] & io_reg[offset]));
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return;
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case 0x07: /* Port A TxData */
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case 0x0A: /* Port B TxData */
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case 0x0D: /* Port C TxData */
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io_reg[offset] = value;
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return;
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case 0x09: /* Port A S-Ctrl */
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case 0x0C: /* Port B S-Ctrl */
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case 0x0F: /* Port C S-Ctrl */
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io_reg[offset] = (value & 0xF8);
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return;
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}
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}
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uint32 io_read(uint32 offset)
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{
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switch(offset)
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{
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case 0x00: /* Version register */
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{
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uint8 has_scd = 0x20; /* No Sega CD unit attached */
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uint8 gen_ver = (config.bios_enabled == 3) ? 0x01 : 0x00; /* hardware version */
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return (region_code | has_scd | gen_ver);
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}
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case 0x01: /* Port A Data */
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case 0x02: /* Port B Data */
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case 0x03: /* Port C Data */
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{
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uint8 input = 0x7F; /* default input state */
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if(port[offset-1].data_r) input = port[offset-1].data_r();
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return (io_reg[offset] | ((~io_reg[offset+3]) & input));
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}
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default:
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return (io_reg[offset]);
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}
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}
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