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snes9x/bsx.cpp

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/***********************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com),
Jerremy Koot (jkoot@snes9x.com)
(c) Copyright 2002 - 2004 Matthew Kendora
(c) Copyright 2002 - 2005 Peter Bortas (peter@bortas.org)
(c) Copyright 2004 - 2005 Joel Yliluoma (http://iki.fi/bisqwit/)
(c) Copyright 2001 - 2006 John Weidman (jweidman@slip.net)
(c) Copyright 2002 - 2006 funkyass (funkyass@spam.shaw.ca),
Kris Bleakley (codeviolation@hotmail.com)
(c) Copyright 2002 - 2010 Brad Jorsch (anomie@users.sourceforge.net),
Nach (n-a-c-h@users.sourceforge.net),
(c) Copyright 2002 - 2011 zones (kasumitokoduck@yahoo.com)
(c) Copyright 2006 - 2007 nitsuja
(c) Copyright 2009 - 2016 BearOso,
OV2
BS-X C emulator code
(c) Copyright 2005 - 2006 Dreamer Nom,
zones
C4 x86 assembler and some C emulation code
(c) Copyright 2000 - 2003 _Demo_ (_demo_@zsnes.com),
Nach,
zsKnight (zsknight@zsnes.com)
C4 C++ code
(c) Copyright 2003 - 2006 Brad Jorsch,
Nach
DSP-1 emulator code
(c) Copyright 1998 - 2006 _Demo_,
Andreas Naive (andreasnaive@gmail.com),
Gary Henderson,
Ivar (ivar@snes9x.com),
John Weidman,
Kris Bleakley,
Matthew Kendora,
Nach,
neviksti (neviksti@hotmail.com)
DSP-2 emulator code
(c) Copyright 2003 John Weidman,
Kris Bleakley,
Lord Nightmare (lord_nightmare@users.sourceforge.net),
Matthew Kendora,
neviksti
DSP-3 emulator code
(c) Copyright 2003 - 2006 John Weidman,
Kris Bleakley,
Lancer,
z80 gaiden
DSP-4 emulator code
(c) Copyright 2004 - 2006 Dreamer Nom,
John Weidman,
Kris Bleakley,
Nach,
z80 gaiden
OBC1 emulator code
(c) Copyright 2001 - 2004 zsKnight,
pagefault (pagefault@zsnes.com),
Kris Bleakley
Ported from x86 assembler to C by sanmaiwashi
SPC7110 and RTC C++ emulator code used in 1.39-1.51
(c) Copyright 2002 Matthew Kendora with research by
zsKnight,
John Weidman,
Dark Force
SPC7110 and RTC C++ emulator code used in 1.52+
(c) Copyright 2009 byuu,
neviksti
S-DD1 C emulator code
(c) Copyright 2003 Brad Jorsch with research by
Andreas Naive,
John Weidman
S-RTC C emulator code
(c) Copyright 2001 - 2006 byuu,
John Weidman
ST010 C++ emulator code
(c) Copyright 2003 Feather,
John Weidman,
Kris Bleakley,
Matthew Kendora
Super FX x86 assembler emulator code
(c) Copyright 1998 - 2003 _Demo_,
pagefault,
zsKnight
Super FX C emulator code
(c) Copyright 1997 - 1999 Ivar,
Gary Henderson,
John Weidman
Sound emulator code used in 1.5-1.51
(c) Copyright 1998 - 2003 Brad Martin
(c) Copyright 1998 - 2006 Charles Bilyue'
Sound emulator code used in 1.52+
(c) Copyright 2004 - 2007 Shay Green (gblargg@gmail.com)
S-SMP emulator code used in 1.54+
(c) Copyright 2016 byuu
SH assembler code partly based on x86 assembler code
(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
2xSaI filter
(c) Copyright 1999 - 2001 Derek Liauw Kie Fa
HQ2x, HQ3x, HQ4x filters
(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
NTSC filter
(c) Copyright 2006 - 2007 Shay Green
GTK+ GUI code
(c) Copyright 2004 - 2016 BearOso
Win32 GUI code
(c) Copyright 2003 - 2006 blip,
funkyass,
Matthew Kendora,
Nach,
nitsuja
(c) Copyright 2009 - 2011 OV2
Mac OS GUI code
(c) Copyright 1998 - 2001 John Stiles
(c) Copyright 2001 - 2011 zones
Specific ports contains the works of other authors. See headers in
individual files.
Snes9x homepage: http://www.snes9x.com/
Permission to use, copy, modify and/or distribute Snes9x in both binary
and source form, for non-commercial purposes, is hereby granted without
fee, providing that this license information and copyright notice appear
with all copies and any derived work.
This software is provided 'as-is', without any express or implied
warranty. In no event shall the authors be held liable for any damages
arising from the use of this software or it's derivatives.
Snes9x is freeware for PERSONAL USE only. Commercial users should
seek permission of the copyright holders first. Commercial use includes,
but is not limited to, charging money for Snes9x or software derived from
Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
using Snes9x as a promotion for your commercial product.
The copyright holders request that bug fixes and improvements to the code
should be forwarded to them so everyone can benefit from the modifications
in future versions.
Super NES and Super Nintendo Entertainment System are trademarks of
Nintendo Co., Limited and its subsidiary companies.
***********************************************************************************/
// Dreamer Nom wrote:
// Large thanks to John Weidman for all his initial research
// Thanks to Seph3 for his modem notes
#include "snes9x.h"
#include "memmap.h"
#include "display.h"
//#define BSX_DEBUG
#define BIOS_SIZE 0x100000
#define FLASH_SIZE 0x200000
#define PSRAM_SIZE 0x80000
#define Map Memory.Map
#define BlockIsRAM Memory.BlockIsRAM
#define BlockIsROM Memory.BlockIsROM
#define RAM Memory.RAM
#define SRAM Memory.SRAM
#define PSRAM Memory.BSRAM
#define BIOSROM Memory.BIOSROM
#define MAP_BSX Memory.MAP_BSX
#define MAP_CPU Memory.MAP_CPU
#define MAP_PPU Memory.MAP_PPU
#define MAP_NONE Memory.MAP_NONE
#define BSXPPUBASE 0x2180
struct SBSX_RTC
{
int hours;
int minutes;
int seconds;
int ticks;
};
static struct SBSX_RTC BSX_RTC;
// flash card vendor information
static const uint8 flashcard[20] =
{
0x4D, 0x00, 0x50, 0x00, // vendor id
0x00, 0x00, // ?
0x2B, 0x00, // 2MB Flash (1MB = 0x2A)
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const uint8 init2192[32] = // FIXME
{
00, 00, 00, 00, 00, // unknown
01, 01, 00, 00, 00,
00, // seconds (?)
00, // minutes
00, // hours
10, 10, 10, 10, 10, // unknown
10, 10, 10, 10, 10, // dummy
00, 00, 00, 00, 00, 00, 00, 00, 00
};
static bool8 FlashMode;
static uint32 FlashSize;
static uint8 *MapROM, *FlashROM;
static void BSX_Map_SNES (void);
static void BSX_Map_LoROM (void);
static void BSX_Map_HiROM (void);
static void BSX_Map_MMC (void);
static void BSX_Map_FlashIO (void);
static void BSX_Map_SRAM (void);
static void BSX_Map_PSRAM (void);
static void BSX_Map_BIOS (void);
static void BSX_Map_RAM (void);
static void BSX_Map_Dirty (void);
static void BSX_Map (void);
static void BSX_Set_Bypass_FlashIO (uint16, uint8);
static uint8 BSX_Get_Bypass_FlashIO (uint16);
static bool8 BSX_LoadBIOS (void);
static void map_psram_mirror_sub (uint32);
static int is_bsx (unsigned char *);
static void BSX_Map_SNES (void)
{
// These maps will be partially overwritten
int c;
// Banks 00->3F and 80->BF
for (c = 0; c < 0x400; c += 16)
{
Map[c + 0] = Map[c + 0x800] = RAM;
Map[c + 1] = Map[c + 0x801] = RAM;
BlockIsRAM[c + 0] = BlockIsRAM[c + 0x800] = TRUE;
BlockIsRAM[c + 1] = BlockIsRAM[c + 0x801] = TRUE;
Map[c + 2] = Map[c + 0x802] = (uint8 *) MAP_PPU;
Map[c + 3] = Map[c + 0x803] = (uint8 *) MAP_PPU;
Map[c + 4] = Map[c + 0x804] = (uint8 *) MAP_CPU;
Map[c + 5] = Map[c + 0x805] = (uint8 *) MAP_CPU;
Map[c + 6] = Map[c + 0x806] = (uint8 *) MAP_NONE;
Map[c + 7] = Map[c + 0x807] = (uint8 *) MAP_NONE;
}
}
static void BSX_Map_LoROM (void)
{
// These maps will be partially overwritten
int i, c;
// Banks 00->3F and 80->BF
for (c = 0; c < 0x400; c += 16)
{
for (i = c + 8; i < c + 16; i++)
{
Map[i] = Map[i + 0x800] = &MapROM[(c << 11) % FlashSize] - 0x8000;
BlockIsRAM[i] = BlockIsRAM[i + 0x800] = BSX.write_enable;
BlockIsROM[i] = BlockIsROM[i + 0x800] = !BSX.write_enable;
}
}
// Banks 40->7F and C0->FF
for (c = 0; c < 0x400; c += 16)
{
for (i = c; i < c + 8; i++)
Map[i + 0x400] = Map[i + 0xC00] = &MapROM[(c << 11) % FlashSize];
for (i = c + 8; i < c + 16; i++)
Map[i + 0x400] = Map[i + 0xC00] = &MapROM[(c << 11) % FlashSize] - 0x8000;
for (i = c; i < c + 16; i++)
{
BlockIsRAM[i + 0x400] = BlockIsRAM[i + 0xC00] = BSX.write_enable;
BlockIsROM[i + 0x400] = BlockIsROM[i + 0xC00] = !BSX.write_enable;
}
}
}
static void BSX_Map_HiROM (void)
{
// These maps will be partially overwritten
int i, c;
// Banks 00->3F and 80->BF
for (c = 0; c < 0x400; c += 16)
{
for (i = c + 8; i < c + 16; i++)
{
Map[i] = Map[i + 0x800] = &MapROM[(c << 12) % FlashSize];
BlockIsRAM[i] = BlockIsRAM[i + 0x800] = BSX.write_enable;
BlockIsROM[i] = BlockIsROM[i + 0x800] = !BSX.write_enable;
}
}
// Banks 40->7F and C0->FF
for (c = 0; c < 0x400; c += 16)
{
for (i = c; i < c + 16; i++)
{
Map[i + 0x400] = Map[i + 0xC00] = &MapROM[(c << 12) % FlashSize];
BlockIsRAM[i + 0x400] = BlockIsRAM[i + 0xC00] = BSX.write_enable;
BlockIsROM[i + 0x400] = BlockIsROM[i + 0xC00] = !BSX.write_enable;
}
}
}
static void BSX_Map_MMC (void)
{
int c;
// Banks 01->0E:5000-5FFF
for (c = 0x010; c < 0x0F0; c += 16)
{
Map[c + 5] = (uint8 *) MAP_BSX;
BlockIsRAM[c + 5] = BlockIsROM[c + 5] = FALSE;
}
}
static void BSX_Map_FlashIO (void)
{
if (BSX.MMC[0x0C] || BSX.MMC[0x0D])
{
// Bank C0:0000, 2AAA, 5555, FF00-FF1F
for (int c = 0; c < 16; c++)
{
Map[c + 0xC00] = (uint8 *) MAP_BSX;
BlockIsRAM[c + 0xC00] = TRUE;
BlockIsROM[c + 0xC00] = FALSE;
}
}
}
static void BSX_Map_SRAM (void)
{
int c;
// Banks 10->17:5000-5FFF
for (c = 0x100; c < 0x180; c += 16)
{
Map[c + 5] = (uint8 *) SRAM + ((c & 0x70) << 8) - 0x5000;
BlockIsRAM[c + 5] = TRUE;
BlockIsROM[c + 5] = FALSE;
}
}
static void map_psram_mirror_sub (uint32 bank)
{
int i, c;
bank <<= 4;
if (BSX.MMC[0x02])
{
for (c = 0; c < 0x100; c += 16)
{
for (i = c; i < c + 16; i++)
{
Map[i + bank] = &PSRAM[(c << 12) % PSRAM_SIZE];
BlockIsRAM[i + bank] = TRUE;
BlockIsROM[i + bank] = FALSE;
}
}
}
else
{
for (c = 0; c < 0x100; c += 16)
{
for (i = c; i < c + 8; i++)
Map[i + bank] = &PSRAM[(c << 11) % PSRAM_SIZE];
for (i = c + 8; i < c + 16; i++)
Map[i + bank] = &PSRAM[(c << 11) % PSRAM_SIZE] - 0x8000;
for (i = c; i < c + 16; i++)
{
BlockIsRAM[i + bank] = TRUE;
BlockIsROM[i + bank] = FALSE;
}
}
}
}
static void BSX_Map_PSRAM (void)
{
int c;
// Banks 70->77:0000-FFFF
// FIXME: could be toggled by $03
for (c = 0; c < 0x80; c++)
{
Map[c + 0x700] = &PSRAM[((c & 0x70) << 12) % PSRAM_SIZE];
BlockIsRAM[c + 0x700] = TRUE;
BlockIsROM[c + 0x700] = FALSE;
}
// Banks 20->3F:6000-7FFF mirrors 70->77:6000-7FFF
for (c = 0x200; c < 0x400; c += 16)
{
Map[c + 6] = &PSRAM[((c & 0x70) << 12) % PSRAM_SIZE];
Map[c + 7] = &PSRAM[((c & 0x70) << 12) % PSRAM_SIZE];
BlockIsRAM[c + 6] = TRUE;
BlockIsRAM[c + 7] = TRUE;
BlockIsROM[c + 6] = FALSE;
BlockIsROM[c + 7] = FALSE;
}
if (!BSX.MMC[0x05])
// Banks 40->4F:0000-FFFF mirrors 70->77:0000-7FFF
map_psram_mirror_sub(0x40);
if (!BSX.MMC[0x06])
// Banks 50->5F:0000-FFFF mirrors 70->77:0000-7FFF
map_psram_mirror_sub(0x50);
// FIXME
if (!BSX.MMC[0x03])
// Banks 60->6F:0000-FFFF mirrors 70->77:0000-7FFF (?)
map_psram_mirror_sub(0x60);
}
static void BSX_Map_BIOS (void)
{
int i,c;
// Banks 00->1F:8000-FFFF
if (BSX.MMC[0x07])
{
for (c = 0; c < 0x200; c += 16)
{
for (i = c + 8; i < c + 16; i++)
{
Map[i] = &BIOSROM[(c << 11) % BIOS_SIZE] - 0x8000;
BlockIsRAM[i] = FALSE;
BlockIsROM[i] = TRUE;
}
}
}
// Banks 80->9F:8000-FFFF
if (BSX.MMC[0x08])
{
for (c = 0; c < 0x200; c += 16)
{
for (i = c + 8; i < c + 16; i++)
{
Map[i + 0x800] = &BIOSROM[(c << 11) % BIOS_SIZE] - 0x8000;
BlockIsRAM[i + 0x800] = FALSE;
BlockIsROM[i + 0x800] = TRUE;
}
}
}
}
static void BSX_Map_RAM (void)
{
int c;
// Banks 7E->7F
for (c = 0; c < 16; c++)
{
Map[c + 0x7E0] = RAM;
Map[c + 0x7F0] = RAM + 0x10000;
BlockIsRAM[c + 0x7E0] = TRUE;
BlockIsRAM[c + 0x7F0] = TRUE;
BlockIsROM[c + 0x7E0] = FALSE;
BlockIsROM[c + 0x7F0] = FALSE;
}
}
static void BSX_Map_Dirty (void)
{
// for the quick bank change
int i, c;
// Banks 00->1F and 80->9F:8000-FFFF
if (BSX.MMC[0x02])
{
for (c = 0; c < 0x200; c += 16)
{
for (i = c + 8; i < c + 16; i++)
{
Map[i] = Map[i + 0x800] = &MapROM[(c << 12) % FlashSize];
BlockIsRAM[i] = BlockIsRAM[i + 0x800] = BSX.write_enable;
BlockIsROM[i] = BlockIsROM[i + 0x800] = !BSX.write_enable;
}
}
}
else
{
for (c = 0; c < 0x200; c += 16)
{
for (i = c + 8; i < c + 16; i++)
{
Map[i] = Map[i + 0x800] = &MapROM[(c << 11) % FlashSize] - 0x8000;
BlockIsRAM[i] = BlockIsRAM[i + 0x800] = BSX.write_enable;
BlockIsROM[i] = BlockIsROM[i + 0x800] = !BSX.write_enable;
}
}
}
}
static void BSX_Map (void)
{
#ifdef BSX_DEBUG
printf("BS: Remapping\n");
for (int i = 0; i < 32; i++)
printf("BS: MMC %02X: %d\n", i, BSX.MMC[i]);
#endif
memcpy(BSX.prevMMC, BSX.MMC, sizeof(BSX.MMC));
// Do a quick bank change
if (BSX.dirty2 && !BSX.dirty)
{
BSX_Map_Dirty();
BSX_Map_BIOS();
BSX.dirty2 = FALSE;
Memory.map_WriteProtectROM();
return;
}
if (BSX.MMC[0x01])
{
MapROM = PSRAM;
FlashSize = PSRAM_SIZE;
}
else
{
MapROM = FlashROM;
FlashSize = FLASH_SIZE;
}
BSX_Map_SNES();
if (BSX.MMC[0x02])
BSX_Map_HiROM();
else
BSX_Map_LoROM();
BSX_Map_PSRAM();
BSX_Map_SRAM();
BSX_Map_RAM();
BSX_Map_BIOS();
BSX_Map_FlashIO();
BSX_Map_MMC();
// Monitor new register changes
BSX.dirty = FALSE;
BSX.dirty2 = FALSE;
Memory.map_WriteProtectROM();
}
static uint8 BSX_Get_Bypass_FlashIO (uint16 offset)
{
if (BSX.MMC[0x02])
return (MapROM[offset]);
else
{
if (offset < 0x8000)
return (MapROM[offset]);
else
return (MapROM[offset - 0x8000]);
}
}
static void BSX_Set_Bypass_FlashIO (uint16 offset, uint8 byte)
{
if (BSX.MMC[0x02])
MapROM[offset] = byte;
else
{
if (offset < 0x8000)
MapROM[offset] = byte;
else
MapROM[offset - 0x8000] = byte;
}
}
uint8 S9xGetBSX (uint32 address)
{
uint8 bank = (address >> 16) & 0xFF;
uint16 offset = address & 0xFFFF;
uint8 t = 0;
// MMC
if ((bank >= 0x01 && bank <= 0x0E) && (offset == 0x5000))
return (BSX.MMC[bank]);
// Flash IO
if (bank == 0xC0)
{
// default: read-through mode
t = BSX_Get_Bypass_FlashIO(offset);
// note: may be more registers, purposes unknown
switch (offset)
{
case 0x0002:
if (BSX.flash_enable)
t = 0x80; // status register?
break;
case 0x5555:
if (BSX.flash_enable)
t = 0x80; // ???
break;
case 0xFF00:
case 0xFF02:
case 0xFF04:
case 0xFF06:
case 0xFF08:
case 0xFF0A:
case 0xFF0C:
case 0xFF0E:
case 0xFF10:
case 0xFF12:
// return flash vendor information
if (BSX.read_enable)
t = flashcard[offset - 0xFF00];
break;
}
}
return (t);
}
void S9xSetBSX (uint8 byte, uint32 address)
{
uint8 bank = (address >> 16) & 0xFF;
uint16 offset = address & 0xFFFF;
// MMC
if ((bank >= 0x01 && bank <= 0x0E) && (offset == 0x5000))
{
switch (bank)
{
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x09:
case 0x0A:
case 0x0B:
case 0x0C:
case 0x0D:
if (BSX.MMC[bank] != byte)
{
BSX.MMC[bank] = byte;
BSX.dirty = TRUE;
}
break;
case 0x07:
case 0x08:
if (BSX.MMC[bank] != byte)
{
BSX.MMC[bank] = byte;
BSX.dirty2 = TRUE;
}
break;
case 0x0E:
BSX.MMC[bank] = byte;
if (byte && (BSX.dirty || BSX.dirty2))
BSX_Map();
break;
}
}
// Flash IO
if (bank == 0xC0)
{
BSX.old_write = BSX.new_write;
BSX.new_write = address;
// ???: double writes to the desired address will bypass
// flash registers
if (BSX.old_write == BSX.new_write && BSX.write_enable)
{
BSX_Set_Bypass_FlashIO(offset, byte);
return;
}
// flash command handling
// note: incomplete
switch (offset)
{
case 0x0000:
BSX.flash_command <<= 8;
BSX.flash_command |= byte;
if ((BSX.flash_command & 0xFFFF) == 0x38D0)
{
// retrieve information about the flash card
BSX.flash_enable = TRUE;
BSX.read_enable = TRUE;
}
break;
case 0x2AAA:
BSX.flash_command <<= 8;
BSX.flash_command |= byte;
break;
case 0x5555:
BSX.flash_command <<= 8;
BSX.flash_command |= byte;
switch (BSX.flash_command & 0xFFFFFF)
{
case 0xAA55F0:
// turn off flash i/o
BSX.flash_enable = FALSE;
BSX.write_enable = FALSE;
BSX.read_enable = FALSE;
break;
case 0xAA55A0:
// enable writing to flash
BSX.old_write = 0;
BSX.new_write = 0;
BSX.flash_enable = TRUE;
BSX.write_enable = TRUE;
BSX_Map();
break;
case 0xAA5570:
// turn on write-protection
BSX.write_enable = FALSE;
BSX_Map();
break;
case 0xAA5580:
case 0xAA5510:
// ???
break;
}
break;
}
}
}
uint8 S9xGetBSXPPU (uint16 address)
{
uint8 t;
// known read registers
switch (address)
{
// Test register low? (r/w)
case 0x2188:
t = BSX.PPU[0x2188 - BSXPPUBASE];
break;
// Test register high? (r/w)
case 0x2189:
t = BSX.PPU[0x2189 - BSXPPUBASE];
break;
case 0x218A:
t = BSX.PPU[0x218A - BSXPPUBASE];
break;
case 0x218C:
t = BSX.PPU[0x218C - BSXPPUBASE];
break;
// Transmission number low? (r/w)
case 0x218E:
t = BSX.PPU[0x218E - BSXPPUBASE];
break;
// Transmission number high? (r/w)
case 0x218F:
t = BSX.PPU[0x218F - BSXPPUBASE];
break;
// Status register? (r)
case 0x2190:
t = BSX.PPU[0x2190 - BSXPPUBASE];
break;
// Data register? (r/w)
case 0x2192:
// t = BSX.PPU[0x2192 - BSXPPUBASE];
// test
t = BSX.test2192[BSX.out_index++];
if (BSX.out_index == 32)
BSX.out_index = 0;
BSX_RTC.ticks++;
if (BSX_RTC.ticks >= 1000)
{
BSX_RTC.ticks = 0;
BSX_RTC.seconds++;
}
if (BSX_RTC.seconds >= 60)
{
BSX_RTC.seconds = 0;
BSX_RTC.minutes++;
}
if (BSX_RTC.minutes >= 60)
{
BSX_RTC.minutes = 0;
BSX_RTC.hours++;
}
if (BSX_RTC.hours >= 24)
BSX_RTC.hours = 0;
BSX.test2192[10] = BSX_RTC.seconds;
BSX.test2192[11] = BSX_RTC.minutes;
BSX.test2192[12] = BSX_RTC.hours;
break;
// Transmission status? (r/w)
case 0x2193:
// Data ready when bits 2/3 clear?
t = BSX.PPU[0x2193 - BSXPPUBASE] & ~0x0C;
break;
// Reset? (r/w)
case 0x2194:
t = BSX.PPU[0x2194 - BSXPPUBASE];
break;
// Unknown (r)
case 0x2196:
t = BSX.PPU[0x2196 - BSXPPUBASE];
break;
// Unknown (r/w)
case 0x2197:
t = BSX.PPU[0x2197 - BSXPPUBASE];
break;
// Modem protocol? (r/w)
case 0x2199:
t = BSX.PPU[0x2199 - BSXPPUBASE];
break;
default:
t = OpenBus;
break;
}
return (t);
}
void S9xSetBSXPPU (uint8 byte, uint16 address)
{
// known write registers
switch (address)
{
// Test register low? (r/w)
case 0x2188:
BSX.PPU[0x2188 - BSXPPUBASE] = byte;
break;
// Test register high? (r/w)
case 0x2189:
BSX.PPU[0x2189 - BSXPPUBASE] = byte;
break;
case 0x218A:
BSX.PPU[0x218A - BSXPPUBASE] = byte;
break;
case 0x218B:
BSX.PPU[0x218B - BSXPPUBASE] = byte;
break;
case 0x218C:
BSX.PPU[0x218C - BSXPPUBASE] = byte;
break;
// Transmission number low? (r/w)
case 0x218E:
BSX.PPU[0x218E - BSXPPUBASE] = byte;
break;
// Transmission number high? (r/w)
case 0x218F:
BSX.PPU[0x218F - BSXPPUBASE] = byte;
// ?
BSX.PPU[0x218E - BSXPPUBASE] >>= 1;
BSX.PPU[0x218E - BSXPPUBASE] = BSX.PPU[0x218F - BSXPPUBASE] - BSX.PPU[0x218E - BSXPPUBASE];
BSX.PPU[0x218F - BSXPPUBASE] >>= 1;
BSX.PPU[0x2190 - BSXPPUBASE] = 0x80; // ?
break;
// Strobe assert? (w)
case 0x2191:
BSX.PPU[0x2191 - BSXPPUBASE] = byte;
BSX.out_index = 0;
break;
// Data register? (r/w)
case 0x2192:
BSX.PPU[0x2192 - BSXPPUBASE] = 0x01; // ?
BSX.PPU[0x2190 - BSXPPUBASE] = 0x80; // ?
break;
// Transmission status? (r/w)
case 0x2193:
BSX.PPU[0x2193 - BSXPPUBASE] = byte;
break;
// Reset? (r/w)
case 0x2194:
BSX.PPU[0x2194 - BSXPPUBASE] = byte;
break;
// Unknown (r/w)
case 0x2197:
BSX.PPU[0x2197 - BSXPPUBASE] = byte;
break;
// Modem protocol? (r/w)
case 0x2199:
// Lots of modem strings written here when
// connection is lost or no uplink established
BSX.PPU[0x2199 - BSXPPUBASE] = byte;
break;
}
}
uint8 * S9xGetBasePointerBSX (uint32 address)
{
return (MapROM);
}
static bool8 BSX_LoadBIOS (void)
{
FILE *fp;
char path[PATH_MAX + 1], name[PATH_MAX + 1];
bool8 r = FALSE;
strcpy(path, S9xGetDirectory(BIOS_DIR));
strcat(path, SLASH_STR);
strcpy(name, path);
strcat(name, "BS-X.bin");
fp = fopen(name, "rb");
if (!fp)
{
strcpy(name, path);
strcat(name, "BS-X.bios");
fp = fopen(name, "rb");
}
if (fp)
{
size_t size;
size = fread((void *) BIOSROM, 1, BIOS_SIZE, fp);
fclose(fp);
if (size == BIOS_SIZE)
r = TRUE;
}
#ifdef BSX_DEBUG
if (r)
printf("BS: BIOS found.\n");
else
printf("BS: BIOS not found!\n");
#endif
return (r);
}
static bool8 is_BSX_BIOS (const uint8 *data, uint32 size)
{
if (size == BIOS_SIZE && strncmp((char *) (data + 0x7FC0), "Satellaview BS-X ", 21) == 0)
return (TRUE);
else
return (FALSE);
}
void S9xInitBSX (void)
{
Settings.BS = FALSE;
if (is_BSX_BIOS(Memory.ROM,Memory.CalculatedSize))
{
// BS-X itself
Settings.BS = TRUE;
Settings.BSXItself = TRUE;
Memory.LoROM = TRUE;
Memory.HiROM = FALSE;
memmove(BIOSROM, Memory.ROM, BIOS_SIZE);
FlashMode = FALSE;
FlashSize = FLASH_SIZE;
BSX.bootup = TRUE;
}
else
{
Settings.BSXItself = FALSE;
int r1, r2;
r1 = (is_bsx(Memory.ROM + 0x7FC0) == 1);
r2 = (is_bsx(Memory.ROM + 0xFFC0) == 1);
Settings.BS = (r1 | r2) ? TRUE : FALSE;
if (Settings.BS)
{
// BS games
Memory.LoROM = r1 ? TRUE : FALSE;
Memory.HiROM = r2 ? TRUE : FALSE;
uint8 *header = r1 ? Memory.ROM + 0x7FC0 : Memory.ROM + 0xFFC0;
FlashMode = (header[0x18] & 0xEF) == 0x20 ? FALSE : TRUE;
FlashSize = (header[0x19] & 0x20) ? PSRAM_SIZE : FLASH_SIZE;
#ifdef BSX_DEBUG
for (int i = 0; i <= 0x1F; i++)
printf("BS: ROM Header %02X: %02X\n", i, header[i]);
printf("BS: FlashMode: %d, FlashSize: %x\n", FlashMode, FlashSize);
#endif
BSX.bootup = Settings.BSXBootup;
if (!BSX_LoadBIOS() && !is_BSX_BIOS(BIOSROM,BIOS_SIZE))
{
BSX.bootup = FALSE;
memset(BIOSROM, 0, BIOS_SIZE);
}
}
}
if (Settings.BS)
{
MapROM = NULL;
FlashROM = Memory.ROM;
time_t t;
struct tm *tmr;
time(&t);
tmr = localtime(&t);
BSX_RTC.ticks = 0;
memcpy(BSX.test2192, init2192, sizeof(init2192));
BSX.test2192[10] = BSX_RTC.seconds = tmr->tm_sec;
BSX.test2192[11] = BSX_RTC.minutes = tmr->tm_min;
BSX.test2192[12] = BSX_RTC.hours = tmr->tm_hour;
#ifdef BSX_DEBUG
printf("BS: Current Time: %02d:%02d:%02d\n", BSX_RTC.hours, BSX_RTC.minutes, BSX_RTC.seconds);
#endif
SNESGameFixes.SRAMInitialValue = 0x00;
}
}
void S9xResetBSX (void)
{
if (Settings.BSXItself)
memset(Memory.ROM, 0, FLASH_SIZE);
memset(BSX.PPU, 0, sizeof(BSX.PPU));
memset(BSX.MMC, 0, sizeof(BSX.MMC));
memset(BSX.prevMMC, 0, sizeof(BSX.prevMMC));
BSX.dirty = FALSE;
BSX.dirty2 = FALSE;
BSX.flash_enable = FALSE;
BSX.write_enable = FALSE;
BSX.read_enable = FALSE;
BSX.flash_command = 0;
BSX.old_write = 0;
BSX.new_write = 0;
BSX.out_index = 0;
memset(BSX.output, 0, sizeof(BSX.output));
// starting from the bios
if (BSX.bootup)
BSX.MMC[0x07] = BSX.MMC[0x08] = 0x80;
else
{
BSX.MMC[0x02] = FlashMode ? 0x80: 0;
// per bios: run from psram or flash card
if (FlashSize == PSRAM_SIZE)
{
memcpy(PSRAM, FlashROM, PSRAM_SIZE);
BSX.MMC[0x01] = 0x80;
BSX.MMC[0x03] = 0x80;
BSX.MMC[0x04] = 0x80;
BSX.MMC[0x0C] = 0x80;
BSX.MMC[0x0D] = 0x80;
}
else
{
BSX.MMC[0x03] = 0x80;
BSX.MMC[0x05] = 0x80;
BSX.MMC[0x06] = 0x80;
}
BSX.MMC[0x0E] = 0x80;
}
BSX_Map();
}
void S9xBSXPostLoadState (void)
{
uint8 temp[16];
bool8 pd1, pd2;
pd1 = BSX.dirty;
pd2 = BSX.dirty2;
memcpy(temp, BSX.MMC, sizeof(BSX.MMC));
memcpy(BSX.MMC, BSX.prevMMC, sizeof(BSX.MMC));
BSX_Map();
memcpy(BSX.MMC, temp, sizeof(BSX.MMC));
BSX.dirty = pd1;
BSX.dirty2 = pd2;
}
static bool valid_normal_bank (unsigned char bankbyte)
{
switch (bankbyte)
{
case 32: case 33: case 48: case 49:
return (true);
break;
}
return (false);
}
static int is_bsx (unsigned char *p)
{
if ((p[26] == 0x33 || p[26] == 0xFF) && (!p[21] || (p[21] & 131) == 128) && valid_normal_bank(p[24]))
{
unsigned char m = p[22];
if (!m && !p[23])
return (2);
if ((m == 0xFF && p[23] == 0xFF) || (!(m & 0xF) && ((m >> 4) - 1 < 12)))
return (1);
}
return (0);
}
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