114 lines
2.4 KiB
C++
114 lines
2.4 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Board831128C //
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//////////////////////////////////////////////////////////////////////////
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void Board831128C::Reset()
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{
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irq_enable = 0;
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irq_counter = 0;
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irq_latch = 0;
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irq_clock = 0;
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bn = 1;
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SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
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SetVROM_8K_Bank( 0 );
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}
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void Board831128C::Write( WORD addr, BYTE data )
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{
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// DEBUGOUT( "Write - addr= %04x ; dat= %03x\n", addr, data );
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BYTE bank = (data&((0x10*bn)|0x0F))+(0x10*bn);
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switch( addr & 0x0F ) {
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case 0x00: case 0x01:
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case 0x02: case 0x03:
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case 0x04: case 0x05:
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case 0x06: case 0x07:
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SetVROM_1K_Bank( addr&0x07, data+(0x100*bn) );
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break;
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case 0x08:
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if(!bn && !(data&0x40)) SetPROM_8K_Bank( 3, bank );
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break;
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case 0x09:
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SetPROM_8K_Bank( 4, bank );
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break;
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case 0x0A:
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SetPROM_8K_Bank( 5, bank );
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break;
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case 0x0B:
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DEBUGOUT( "Write - addr= %04x ; dat= %03x\n", addr, data );
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// SetPROM_8K_Bank( 6, bank );
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break;
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case 0x0C:
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data &= 0x03;
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if( data == 0 ) SetVRAM_Mirror( VRAM_VMIRROR );
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else if( data == 1 ) SetVRAM_Mirror( VRAM_HMIRROR );
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else if( data == 2 ) SetVRAM_Mirror( VRAM_MIRROR4L );
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else SetVRAM_Mirror( VRAM_MIRROR4H );
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break;
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case 0x0D:
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irq_enable = data;
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// irq_enable = (irq_enable & 0x01) * 3;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0x0E:
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bn = (addr >> 14) & 1;
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SetPROM_32K_Bank( 0, 1, 0x0E|(0x20*bn), 0x0F|(0x20*bn) );
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break;
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case 0x0F:
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irq_counter = (irq_counter & 0xFF00) | RAM[0x0E];
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BYTE VVV = (((data-0xF1)&0xFF)^0xFF)>>1;
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irq_counter = (irq_counter & 0x00FF) | (VVV << 8);
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// irq_enable = data & 0x03;
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// irq_latch = data;
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// irq_counter = data;
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// irq_clock = 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 Board831128C::HSync( INT scanline )
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{
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if( irq_enable ) {
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irq_counter -= 114;
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if( irq_counter <= 0 ) {
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nes->cpu->SetIRQ( IRQ_MAPPER );
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irq_enable = 0;
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irq_counter = 0xFFFF;
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}
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}
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}
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void Board831128C::Clock( INT cycles )
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{
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/* if( irq_enable ) {
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irq_clock += cycles*4;
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while( irq_clock >= 455 ) {
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irq_clock -= 455;
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irq_counter++;
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if( irq_counter == 0 ) {
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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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void Board831128C::SaveState( LPBYTE p )
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{
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//
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}
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void Board831128C::LoadState( LPBYTE p )
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{
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//
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}
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