mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-12 13:55:07 +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
/***************************************************************************************
|
|
* Genesis Plus
|
|
* I/O Chip
|
|
*
|
|
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
|
|
* Eke-Eke (2007,2008,2009), additional code & fixes for the GCN/Wii port
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
****************************************************************************************/
|
|
|
|
#include "shared.h"
|
|
|
|
uint8 io_reg[0x10];
|
|
uint8 region_code = REGION_USA;
|
|
int old_system[2] = {-1,-1};
|
|
|
|
static struct port_t
|
|
{
|
|
void (*data_w)(uint32 data);
|
|
uint32 (*data_r)(void);
|
|
} port[3];
|
|
|
|
/*****************************************************************************
|
|
* I/O chip functions *
|
|
* *
|
|
*****************************************************************************/
|
|
void io_init(void)
|
|
{
|
|
/* restore previous setting */
|
|
if (old_system[0] != -1) input.system[0] = old_system[0];
|
|
if (old_system[1] != -1) input.system[1] = old_system[1];
|
|
|
|
/* initialize default GUN settings */
|
|
input.x_offset = 0x00;
|
|
input.y_offset = 0x00;
|
|
|
|
/**********************************************
|
|
SEGA MENACER
|
|
***********************************************/
|
|
if (strstr(rominfo.international,"MENACER") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1) old_system[0] = input.system[0];
|
|
if (old_system[1] == -1) old_system[1] = input.system[1];
|
|
|
|
input.system[0] = NO_SYSTEM;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 0x52;
|
|
input.y_offset = 0x00;
|
|
}
|
|
else if (strstr(rominfo.international,"T2 ; THE ARCADE GAME") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1) old_system[0] = input.system[0];
|
|
if (old_system[1] == -1) old_system[1] = input.system[1];
|
|
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 0x84;
|
|
input.y_offset = 0x08;
|
|
}
|
|
else if (strstr(rominfo.international,"BODY COUNT") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1) old_system[0] = input.system[0];
|
|
if (old_system[1] == -1) old_system[1] = input.system[1];
|
|
|
|
input.system[0] = SYSTEM_MOUSE;
|
|
input.system[1] = SYSTEM_MENACER;
|
|
input.x_offset = 0x44;
|
|
input.y_offset = 0x18;
|
|
}
|
|
|
|
/**********************************************
|
|
KONAMI JUSTIFIER
|
|
***********************************************/
|
|
else if (strstr(rominfo.international,"LETHAL ENFORCERSII") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1) old_system[0] = input.system[0];
|
|
if (old_system[1] == -1) old_system[1] = input.system[1];
|
|
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_JUSTIFIER;
|
|
input.x_offset = 0x18;
|
|
input.y_offset = 0x00;
|
|
}
|
|
else if (strstr(rominfo.international,"LETHAL ENFORCERS") != NULL)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1) old_system[0] = input.system[0];
|
|
if (old_system[1] == -1) old_system[1] = input.system[1];
|
|
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_JUSTIFIER;
|
|
input.x_offset = 0x00;
|
|
input.y_offset = 0x00;
|
|
}
|
|
|
|
/**********************************************
|
|
J-CART
|
|
***********************************************/
|
|
if (cart.hw.jcart)
|
|
{
|
|
/* save current setting */
|
|
if (old_system[0] == -1) old_system[0] = input.system[0];
|
|
if (old_system[1] == -1) old_system[1] = input.system[1];
|
|
|
|
/* set default settings */
|
|
input.system[0] = SYSTEM_GAMEPAD;
|
|
input.system[1] = SYSTEM_GAMEPAD;
|
|
}
|
|
|
|
/**********************************************
|
|
Initialize IO Port handlers
|
|
***********************************************/
|
|
switch (input.system[0])
|
|
{
|
|
case SYSTEM_GAMEPAD:
|
|
port[0].data_w = gamepad_1_write;
|
|
port[0].data_r = gamepad_1_read;
|
|
break;
|
|
|
|
case SYSTEM_MOUSE:
|
|
port[0].data_w = mouse_write;
|
|
port[0].data_r = mouse_read;
|
|
break;
|
|
|
|
case SYSTEM_WAYPLAY:
|
|
port[0].data_w = wayplay_1_write;
|
|
port[0].data_r = wayplay_1_read;
|
|
break;
|
|
|
|
case SYSTEM_TEAMPLAYER:
|
|
port[0].data_w = teamplayer_1_write;
|
|
port[0].data_r = teamplayer_1_read;
|
|
break;
|
|
|
|
default:
|
|
port[0].data_w = NULL;
|
|
port[0].data_r = NULL;
|
|
break;
|
|
}
|
|
|
|
switch (input.system[1])
|
|
{
|
|
case SYSTEM_GAMEPAD:
|
|
port[1].data_w = gamepad_2_write;
|
|
port[1].data_r = gamepad_2_read;
|
|
break;
|
|
|
|
case SYSTEM_MOUSE:
|
|
port[1].data_w = mouse_write;
|
|
port[1].data_r = mouse_read;
|
|
break;
|
|
|
|
case SYSTEM_MENACER:
|
|
port[1].data_w = NULL;
|
|
port[1].data_r = menacer_read;
|
|
break;
|
|
|
|
case SYSTEM_JUSTIFIER:
|
|
port[1].data_w = NULL;
|
|
port[1].data_r = justifier_read;
|
|
break;
|
|
|
|
case SYSTEM_WAYPLAY:
|
|
port[1].data_w = wayplay_2_write;
|
|
port[1].data_r = wayplay_2_read;
|
|
break;
|
|
|
|
case SYSTEM_TEAMPLAYER:
|
|
port[1].data_w = teamplayer_2_write;
|
|
port[1].data_r = teamplayer_2_read;
|
|
break;
|
|
|
|
default:
|
|
port[1].data_w = NULL;
|
|
port[1].data_r = NULL;
|
|
break;
|
|
}
|
|
|
|
/* External Port (unconnected) */
|
|
port[2].data_w = NULL;
|
|
port[2].data_r = NULL;
|
|
|
|
/* Initialize Input Devices */
|
|
input_init();
|
|
}
|
|
|
|
|
|
void io_reset(void)
|
|
{
|
|
/* I/O register default settings */
|
|
uint8 io_def[0x10] =
|
|
{
|
|
0xA0,
|
|
0x7F, 0x7F, 0x7F,
|
|
0x00, 0x00, 0x00,
|
|
0xFF, 0x00, 0x00,
|
|
0xFF, 0x00, 0x00,
|
|
0xFB, 0x00, 0x00,
|
|
};
|
|
|
|
/* Reset I/O registers */
|
|
memcpy (io_reg, io_def, 0x10);
|
|
|
|
/* Reset Input Devices */
|
|
input_reset();
|
|
}
|
|
|
|
void io_write(uint32 offset, uint32 value)
|
|
{
|
|
switch (offset)
|
|
{
|
|
case 0x01: /* Port A Data */
|
|
case 0x02: /* Port B Data */
|
|
case 0x03: /* Port C Data */
|
|
io_reg[offset] = ((value & 0x80) | (value & io_reg[offset+3]));
|
|
if(port[offset-1].data_w) port[offset-1].data_w(value);
|
|
return;
|
|
|
|
case 0x05: /* Port B Ctrl */
|
|
if (((value & 0x7F) == 0x7F) &&
|
|
((input.system[0] == SYSTEM_TEAMPLAYER) ||
|
|
(input.system[1] == SYSTEM_TEAMPLAYER)))
|
|
{
|
|
/* autodetect 4-Way play ! */
|
|
input.system[0] = SYSTEM_WAYPLAY;
|
|
input.system[1] = SYSTEM_WAYPLAY;
|
|
port[0].data_w = wayplay_1_write;
|
|
port[0].data_r = wayplay_1_read;
|
|
port[1].data_w = wayplay_2_write;
|
|
port[1].data_r = wayplay_2_read;
|
|
input_reset();
|
|
}
|
|
|
|
case 0x04: /* Port A Ctrl */
|
|
case 0x06: /* Port C Ctrl */
|
|
io_reg[offset] = value & 0xFF;
|
|
io_reg[offset-3] = ((io_reg[offset-3] & 0x80) | (io_reg[offset-3] & io_reg[offset]));
|
|
return;
|
|
|
|
case 0x07: /* Port A TxData */
|
|
case 0x0A: /* Port B TxData */
|
|
case 0x0D: /* Port C TxData */
|
|
io_reg[offset] = value;
|
|
return;
|
|
|
|
case 0x09: /* Port A S-Ctrl */
|
|
case 0x0C: /* Port B S-Ctrl */
|
|
case 0x0F: /* Port C S-Ctrl */
|
|
io_reg[offset] = (value & 0xF8);
|
|
return;
|
|
}
|
|
}
|
|
|
|
uint32 io_read(uint32 offset)
|
|
{
|
|
switch(offset)
|
|
{
|
|
case 0x00: /* Version register */
|
|
{
|
|
uint8 has_scd = 0x20; /* No Sega CD unit attached */
|
|
uint8 gen_ver = (config.bios_enabled == 3) ? 0x01 : 0x00; /* hardware version */
|
|
return (region_code | has_scd | gen_ver);
|
|
}
|
|
|
|
case 0x01: /* Port A Data */
|
|
case 0x02: /* Port B Data */
|
|
case 0x03: /* Port C Data */
|
|
{
|
|
uint8 input = 0x7F; /* default input state */
|
|
if(port[offset-1].data_r) input = port[offset-1].data_r();
|
|
return (io_reg[offset] | ((~io_reg[offset+3]) & input));
|
|
}
|
|
|
|
default:
|
|
return (io_reg[offset]);
|
|
}
|
|
}
|