sin365/AxibugEmuOnline
1
0
Fork 1
Code Issues Pull Requests Projects Releases Wiki Activity
e4da00136d
AxibugEmuOnline/References/VirtuaNESex_src_191105/NES/Mapper/Mapper249.cpp

319 lines
6.7 KiB
C++
Raw Normal View History

readme + references
2024-08-05 17:58:53 +08:00
//////////////////////////////////////////////////////////////////////////
// Mapper249 MMC3 //
//////////////////////////////////////////////////////////////////////////
void Mapper249::Reset()
{
for( INT i = 0; i < 8; i++ ) {
reg[i] = 0x00;
}
prg0 = 0;
prg1 = 1;
SetPROM_32K_Bank( 0,1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
chr01 = 0;
chr23 = 2;
chr4 = 4;
chr5 = 5;
chr6 = 6;
chr7 = 7;
SetVROM_8K_Bank( 0 );
we_sram = 0; // Disable
irq_enable = 0; // Disable
irq_counter = 0;
irq_latch = 0;
irq_request = 0;
// IRQ<52>^<5E>C<EFBFBD>v<EFBFBD>ݒ<EFBFBD>
nes->SetIrqType( NES::IRQ_CLOCK );
spdata = 0;
}
void Mapper249::WriteLow( WORD addr, BYTE data )
{
if( addr == 0x5000 ) {
switch( data ) {
case 0x00:
spdata = 0;
break;
case 0x02:
spdata = 1;
break;
}
}
if( addr>=0x6000 && addr<0x8000 ) {
CPU_MEM_BANK[addr>>13][addr&0x1FFF] = data;
}
}
void Mapper249::Write( WORD addr, BYTE data )
{
BYTE m0,m1,m2,m3,m4,m5,m6,m7;
switch( addr&0xFF01 ) {
case 0x8000:
case 0x8800:
reg[0] = data;
break;
case 0x8001:
case 0x8801:
switch( reg[0] & 0x07 ) {
case 0x00:
if( spdata == 1 ) {
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=(data&0x20)>>5;
m6=(data&0x40)>>6;
m7=(data&0x80)>>7;
data=(m5<<7)|(m4<<6)|(m2<<5)|(m6<<4)|(m7<<3)|(m3<<2)|(m1<<1)|m0;
}
SetVROM_1K_Bank( 0, data&0xFE );
SetVROM_1K_Bank( 1, data|0x01 );
break;
case 0x01:
if( spdata == 1 ) {
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=(data&0x20)>>5;
m6=(data&0x40)>>6;
m7=(data&0x80)>>7;
data=(m5<<7)|(m4<<6)|(m2<<5)|(m6<<4)|(m7<<3)|(m3<<2)|(m1<<1)|m0;
}
SetVROM_1K_Bank( 2, data&0xFE );
SetVROM_1K_Bank( 3, data|0x01 );
break;
case 0x02:
if( spdata == 1 ) {
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=(data&0x20)>>5;
m6=(data&0x40)>>6;
m7=(data&0x80)>>7;
data=(m5<<7)|(m4<<6)|(m2<<5)|(m6<<4)|(m7<<3)|(m3<<2)|(m1<<1)|m0;
}
SetVROM_1K_Bank( 4, data );
break;
case 0x03:
if( spdata == 1 ) {
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=(data&0x20)>>5;
m6=(data&0x40)>>6;
m7=(data&0x80)>>7;
data=(m5<<7)|(m4<<6)|(m2<<5)|(m6<<4)|(m7<<3)|(m3<<2)|(m1<<1)|m0;
}
SetVROM_1K_Bank( 5, data );
break;
case 0x04:
if( spdata == 1 ) {
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=(data&0x20)>>5;
m6=(data&0x40)>>6;
m7=(data&0x80)>>7;
data=(m5<<7)|(m4<<6)|(m2<<5)|(m6<<4)|(m7<<3)|(m3<<2)|(m1<<1)|m0;
}
SetVROM_1K_Bank( 6, data );
break;
case 0x05:
if( spdata == 1 ) {
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=(data&0x20)>>5;
m6=(data&0x40)>>6;
m7=(data&0x80)>>7;
data=(m5<<7)|(m4<<6)|(m2<<5)|(m6<<4)|(m7<<3)|(m3<<2)|(m1<<1)|m0;
}
SetVROM_1K_Bank( 7, data );
break;
case 0x06:
if( spdata == 1 ) {
if( data < 0x20 ) {
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=0;
m6=0;
m7=0;
data=(m7<<7)|(m6<<6)|(m5<<5)|(m2<<4)|(m1<<3)|(m3<<2)|(m4<<1)|m0;
} else {
data=data-0x20;
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=(data&0x20)>>5;
m6=(data&0x40)>>6;
m7=(data&0x80)>>7;
data=(m5<<7)|(m4<<6)|(m2<<5)|(m6<<4)|(m7<<3)|(m3<<2)|(m1<<1)|m0;
}
}
SetPROM_8K_Bank( 4, data );
break;
case 0x07:
if( spdata == 1 ) {
if( data < 0x20 ) {
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=0;
m6=0;
m7=0;
data=(m7<<7)|(m6<<6)|(m5<<5)|(m2<<4)|(m1<<3)|(m3<<2)|(m4<<1)|m0;
} else {
data=data-0x20;
m0=data&0x1;
m1=(data&0x02)>>1;
m2=(data&0x04)>>2;
m3=(data&0x08)>>3;
m4=(data&0x10)>>4;
m5=(data&0x20)>>5;
m6=(data&0x40)>>6;
m7=(data&0x80)>>7;
data=(m5<<7)|(m4<<6)|(m2<<5)|(m6<<4)|(m7<<3)|(m3<<2)|(m1<<1)|m0;
}
}
SetPROM_8K_Bank( 5, data );
break;
}
break;
case 0xA000:
case 0xA800:
reg[2] = data;
if( !nes->rom->Is4SCREEN() ) {
if( data & 0x01 ) SetVRAM_Mirror( VRAM_HMIRROR );
else SetVRAM_Mirror( VRAM_VMIRROR );
}
break;
case 0xA001:
case 0xA801:
reg[3] = data;
break;
case 0xC000:
case 0xC800:
reg[4] = data;
irq_counter = data;
irq_request = 0;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0xC001:
case 0xC801:
reg[5] = data;
irq_latch = data;
irq_request = 0;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0xE000:
case 0xE800:
reg[6] = data;
irq_enable = 0;
irq_request = 0;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
case 0xE001:
case 0xE801:
reg[7] = data;
irq_enable = 1;
irq_request = 0;
nes->cpu->ClrIRQ( IRQ_MAPPER );
break;
}
}
void Mapper249::Clock( INT cycles )
{
// if( irq_request && (nes->GetIrqType() == NES::IRQ_CLOCK) ) {
// nes->cpu->IRQ_NotPending();
// }
}
void Mapper249::HSync( INT scanline )
{
if( (scanline >= 0 && scanline <= 239) ) {
if( nes->ppu->IsDispON() ) {
if( irq_enable && !irq_request ) {
if( scanline == 0 ) {
if( irq_counter ) {
irq_counter--;
}
}
if( !(irq_counter--) ) {
irq_request = 0xFF;
irq_counter = irq_latch;
nes->cpu->SetIRQ( IRQ_MAPPER );
}
}
}
}
// if( irq_request && (nes->GetIrqType() == NES::IRQ_HSYNC) ) {
// nes->cpu->IRQ_NotPending();
// }
}
void Mapper249::SaveState( LPBYTE p )
{
for( INT i = 0; i < 8; i++ ) {
p[i] = reg[i];
}
p[ 8] = prg0;
p[ 9] = prg1;
p[10] = chr01;
p[11] = chr23;
p[12] = chr4;
p[13] = chr5;
p[14] = chr6;
p[15] = chr7;
p[16] = irq_enable;
p[17] = irq_counter;
p[18] = irq_latch;
p[19] = irq_request;
p[20] = spdata;
}
void Mapper249::LoadState( LPBYTE p )
{
for( INT i = 0; i < 8; i++ ) {
reg[i] = p[i];
}
prg0 = p[ 8];
prg1 = p[ 9];
chr01 = p[10];
chr23 = p[11];
chr4 = p[12];
chr5 = p[13];
chr6 = p[14];
chr7 = p[15];
irq_enable = p[16];
irq_counter = p[17];
irq_latch = p[18];
irq_request = p[19];
spdata = p[20];
}
Reference in New Issue Copy Permalink