195 lines
3.9 KiB
C++
195 lines
3.9 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper245 Yong Zhe Dou E Long //
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//////////////////////////////////////////////////////////////////////////
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void Mapper245::Reset()
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{
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for( INT i = 0; i < 8; i++ ) {
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reg[i] = 0x00;
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}
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prg0 = 0;
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prg1 = 1;
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SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
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if( VROM_1K_SIZE ) {
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SetVROM_8K_Bank( 0 );
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}
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we_sram = 0; // Disable
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irq_enable = 0; // Disable
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irq_counter = 0;
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irq_latch = 0;
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irq_request = 0;
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nes->SetIrqType( NES::IRQ_CLOCK );
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}
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void Mapper245::Write( WORD addr, BYTE data )
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{
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switch( addr&0xF7FF ) {
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case 0x8000:
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reg[0] = data;
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break;
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case 0x8001:
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reg[1] = data;
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switch( reg[0] ) {
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case 0x00:
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reg[3]=(data & 2 )<<5;
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SetPROM_8K_Bank(6,0x3E | reg[3]);
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SetPROM_8K_Bank(7,0x3F | reg[3]);
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break;
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case 0x06:
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prg0=data;
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break;
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case 0x07:
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prg1=data;
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break;
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}
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SetPROM_8K_Bank( 4, prg0|reg[3] );
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SetPROM_8K_Bank( 5, prg1|reg[3] );
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break;
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case 0xA000:
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reg[2] = data;
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if( !nes->rom->Is4SCREEN() ) {
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if( data & 0x01 ) SetVRAM_Mirror( VRAM_HMIRROR );
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else SetVRAM_Mirror( VRAM_VMIRROR );
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}
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break;
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case 0xA001:
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break;
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case 0xC000:
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reg[4] = data;
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irq_counter = data;
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irq_request = 0;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0xC001:
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reg[5] = data;
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irq_latch = data;
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irq_request = 0;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0xE000:
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reg[6] = data;
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irq_enable = 0;
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irq_request = 0;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0xE001:
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reg[7] = data;
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irq_enable = 1;
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irq_request = 0;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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}
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}
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void Mapper245::Clock( INT cycles )
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{
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// if( irq_request && (nes->GetIrqType() == NES::IRQ_CLOCK) ) {
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// nes->cpu->IRQ_NotPending();
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// }
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}
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void Mapper245::HSync( INT scanline )
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{
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if( (scanline >= 0 && scanline <= 239) ) {
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if( nes->ppu->IsDispON() ) {
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if( irq_enable && !irq_request ) {
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if( scanline == 0 ) {
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if( irq_counter ) {
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irq_counter--;
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}
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}
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if( !(irq_counter--) ) {
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irq_request = 0xFF;
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irq_counter = irq_latch;
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nes->cpu->SetIRQ( IRQ_MAPPER );
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}
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}
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}
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}
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// if( irq_request && (nes->GetIrqType() == NES::IRQ_HSYNC) ) {
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// nes->cpu->IRQ_NotPending();
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// }
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}
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void Mapper245::SetBank_CPU()
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{
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SetPROM_32K_Bank( prg0, prg1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
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}
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void Mapper245::SetBank_PPU()
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{
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if( VROM_1K_SIZE ) {
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if( reg[0] & 0x80 ) {
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SetVROM_8K_Bank( chr4, chr5, chr6, chr7,
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chr23+1, chr23, chr01+1, chr01 );
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} else {
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SetVROM_8K_Bank( chr01, chr01+1, chr23, chr23+1,
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chr4, chr5, chr6, chr7 );
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}
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} else {
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if( reg[0] & 0x80 ) {
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SetCRAM_1K_Bank( 4, (chr01+0)&0x07 );
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SetCRAM_1K_Bank( 5, (chr01+1)&0x07 );
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SetCRAM_1K_Bank( 6, (chr23+0)&0x07 );
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SetCRAM_1K_Bank( 7, (chr23+1)&0x07 );
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SetCRAM_1K_Bank( 0, chr4&0x07 );
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SetCRAM_1K_Bank( 1, chr5&0x07 );
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SetCRAM_1K_Bank( 2, chr6&0x07 );
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SetCRAM_1K_Bank( 3, chr7&0x07 );
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} else {
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SetCRAM_1K_Bank( 0, (chr01+0)&0x07 );
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SetCRAM_1K_Bank( 1, (chr01+1)&0x07 );
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SetCRAM_1K_Bank( 2, (chr23+0)&0x07 );
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SetCRAM_1K_Bank( 3, (chr23+1)&0x07 );
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SetCRAM_1K_Bank( 4, chr4&0x07 );
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SetCRAM_1K_Bank( 5, chr5&0x07 );
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SetCRAM_1K_Bank( 6, chr6&0x07 );
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SetCRAM_1K_Bank( 7, chr7&0x07 );
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}
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}
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}
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void Mapper245::SaveState( LPBYTE p )
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{
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for( INT i = 0; i < 8; i++ ) {
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p[i] = reg[i];
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}
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p[ 8] = prg0;
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p[ 9] = prg1;
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p[10] = chr01;
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p[11] = chr23;
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p[12] = chr4;
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p[13] = chr5;
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p[14] = chr6;
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p[15] = chr7;
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p[16] = irq_enable;
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p[17] = (BYTE)irq_counter;
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p[18] = irq_latch;
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p[19] = irq_request;
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}
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void Mapper245::LoadState( LPBYTE p )
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{
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for( INT i = 0; i < 8; i++ ) {
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reg[i] = p[i];
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}
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prg0 = p[ 8];
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prg1 = p[ 9];
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chr01 = p[10];
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chr23 = p[11];
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chr4 = p[12];
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chr5 = p[13];
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chr6 = p[14];
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chr7 = p[15];
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irq_enable = p[16];
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irq_counter = (INT)p[17];
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irq_latch = p[18];
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irq_request = p[19];
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}
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