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preliminary support for mapper 253

This commit is contained in:
qeed 2009-10-04 13:56:43 +00:00
parent 1c6ac0a46c
commit b5b5c7affc
4 changed files with 211 additions and 1 deletions
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1
src/ines.cpp
View File

@ -1429,6 +1429,7 @@ static BMAPPING bmap[] = {
{245, Mapper245_Init},
{249, Mapper249_Init},
{250, Mapper250_Init},
{253, Mapper253_Init},
{254, Mapper254_Init},
{ 0, 0}
};

4
src/ines.h
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@ -107,6 +107,7 @@ struct iNES_HEADER {
}
}
};
extern struct iNES_HEADER head; //for mappers usage
void VRAM_BANK1(uint32 A, uint8 V);
void VRAM_BANK4(uint32 A,uint32 V);
@ -341,7 +342,7 @@ void Mapper247_init(void);
void Mapper249_init(void);
void Mapper251_init(void);
void Mapper252_init(void);
void Mapper253_init(void);
//void Mapper253_init(void);
void Mapper255_init(void);
void NSFVRC6_Init(void);
@ -452,6 +453,7 @@ void Mapper240_Init(CartInfo *);
void Mapper245_Init(CartInfo *);
void Mapper249_Init(CartInfo *);
void Mapper250_Init(CartInfo *);
void Mapper253_Init(CartInfo *);
void Mapper254_Init(CartInfo *);
#endif

206
src/mappers/253.cpp Normal file
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@ -0,0 +1,206 @@
//Thanks to VirtualNES developer for reverse engineering this mapper
#include "mapinc.h"
static uint8 reg[9];
static uint8 irq_enable, irq_counter, irq_latch, irq_clock;
static uint8 VRAM_switch;
static void Mapper253_IRQHook(int cycles)
{
if( irq_enable & 0x02 )
{
if( (irq_clock+=cycles) >= 0x72 )
{
irq_clock -= 0x72;
if( irq_counter == 0xFF )
{
irq_counter = irq_latch;
irq_enable = (irq_enable & 0x01) * 3;
X6502_IRQBegin(FCEU_IQEXT);
} else
{
irq_counter++;
}
}
}
}
static void SetBank_PPUSUB(int bank, int page)
{
if(page == 0x88)
{
VRAM_switch = 0;
return;
}
else if(page == 0xC8)
{
VRAM_switch = 1;
return;
}
if ((page == 4) || (page == 5))
{
if(VRAM_switch == 0)
setchr1( bank, page ); //CHR-ROM
else
setchr1( bank, page ); //CHR-RAM
}
else
setchr1( bank, page );
}
static DECLFW(Mapper253_Write)
{
printf("Address: 0x%X V: 0x%X\n", A, V);
if (A == 0x8010) //8kb select at 0x8000
{
setprg8(0x8000, V);
return;
}
if (A == 0xA010) //8kb select at 0xA000
{
setprg8(0xA000, V);
return;
}
if (A == 0x9400) //Mirroring
{
V &= 0x03;
switch (V)
{
case 0:
setmirror(MI_V);
break;
case 1:
setmirror(MI_H);
break;
case 2:
setmirror(MI_0);
break;
case 3:
setmirror(MI_1);
break;
}
}
switch (A & 0xF00C)
{
case 0xB000:
reg[0] = (reg[0] & 0xF0) | (V & 0x0F);
SetBank_PPUSUB( 0, reg[0] );
break;
case 0xB004:
reg[0] = (reg[0] & 0x0F) | ((V & 0x0F) << 4);
SetBank_PPUSUB( 0, reg[0] + ((V>>4)*0x100) );
break;
case 0xB008:
reg[1] = (reg[1] & 0xF0) | (V & 0x0F);
SetBank_PPUSUB( 1, reg[1] );
break;
case 0xB00C:
reg[1] = (reg[1] & 0x0F) | ((V & 0x0F) << 4);
SetBank_PPUSUB( 1, reg[1] + ((V>>4)*0x100) );
break;
case 0xC000:
reg[2] = (reg[2] & 0xF0) | (V & 0x0F);
SetBank_PPUSUB( 2, reg[2] );
break;
case 0xC004:
reg[2] = (reg[2] & 0x0F) | ((V & 0x0F) << 4);
SetBank_PPUSUB( 2, reg[2] + ((V>>4)*0x100) );
break;
case 0xC008:
reg[3] = (reg[3] & 0xF0) | (V & 0x0F);
SetBank_PPUSUB( 3, reg[3] );
break;
case 0xC00C:
reg[3] = (reg[3] & 0x0F) | ((V & 0x0F) << 4);
SetBank_PPUSUB( 3, reg[3] + ((V>>4)*0x100) );
break;
case 0xD000:
reg[4] = (reg[4] & 0xF0) | (V & 0x0F);
SetBank_PPUSUB( 4, reg[4] );
break;
case 0xD004:
reg[4] = (reg[4] & 0x0F) | ((V & 0x0F) << 4);
SetBank_PPUSUB( 4, reg[4] + ((V>>4)*0x100) );
break;
case 0xD008:
reg[5] = (reg[5] & 0xF0) | (V & 0x0F);
SetBank_PPUSUB( 5, reg[5] );
break;
case 0xD00C:
reg[5] = (reg[5] & 0x0F) | ((V & 0x0F) << 4);
SetBank_PPUSUB( 5, reg[5] + ((V>>4)*0x100) );
break;
case 0xE000:
reg[6] = (reg[6] & 0xF0) | (V & 0x0F);
SetBank_PPUSUB( 6, reg[6] );
break;
case 0xE004:
reg[6] = (reg[6] & 0x0F) | ((V & 0x0F) << 4);
SetBank_PPUSUB( 6, reg[6] + ((V>>4)*0x100) );
break;
case 0xE008:
reg[7] = (reg[7] & 0xF0) | (V & 0x0F);
SetBank_PPUSUB( 7, reg[7] );
break;
case 0xE00C:
reg[7] = (reg[7] & 0x0F) | ((V & 0x0F) << 4);
SetBank_PPUSUB( 7, reg[7] + ((V>>4)*0x100) );
break;
case 0xF000:
irq_latch = (irq_latch & 0xF0) | (V & 0x0F);
break;
case 0xF004:
irq_latch = (irq_latch & 0x0F) | ((V & 0x0F) << 4);
break;
case 0xF008:
irq_enable = V & 0x03;
if (irq_enable & 0x02)
{
irq_counter = irq_latch;
irq_clock = 0;
}
X6502_IRQEnd(FCEU_IQEXT);
break;
default:
printf("Not handled 0x%X 0x%X", A, V);
}
}
static void Mapper253_Power(void)
{
int i;
for (i = 0; i != 8; ++i)
reg[i] = i;
reg[8] = 0;
irq_enable = 0;
irq_counter = 0;
irq_latch = 0;
irq_clock = 0;
VRAM_switch = 0;
setprg16(0x8000, 0); //first bank
setprg16(0xC000, head.ROM_size - 1); //last bank
setchr8(0); //first bank
SetWriteHandler(0x8000, 0xFFFF, Mapper253_Write);
SetReadHandler(0x8000, 0xFFFF, CartBR);
}
static void Mapper253_Close(void)
{
}
void Mapper253_Init(CartInfo *info)
{
info->Power = Mapper253_Power;
MapIRQHook = Mapper253_IRQHook;
info->Close = Mapper253_Close;
SetWriteHandler(0x8000, 0xFFFF, Mapper253_Write);
SetReadHandler(0x8000, 0xFFFF, CartBR);
}

1
src/mappers/SConscript
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@ -1,4 +1,5 @@
my_list = Split("""
253.cpp
151.cpp
16.cpp
17.cpp