103 lines
2.8 KiB
C#
103 lines
2.8 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper091 PC-HK-SF3 //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.Core.CPU;
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using static VirtualNes.MMU;
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using BYTE = System.Byte;
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namespace VirtualNes.Core
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{
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public class Mapper091 : Mapper
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{
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BYTE irq_enable;
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BYTE irq_counter;
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public Mapper091(NES parent) : base(parent)
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{
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}
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public override void Reset()
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{
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SetPROM_32K_Bank(PROM_8K_SIZE - 2, PROM_8K_SIZE - 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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if (VROM_8K_SIZE != 0)
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{
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SetVROM_8K_Bank(0, 0, 0, 0, 0, 0, 0, 0);
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}
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irq_enable = 0;
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irq_counter = 0;
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nes.SetRenderMethod(EnumRenderMethod.POST_ALL_RENDER);
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}
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//void Mapper091::WriteLow(WORD addr, BYTE data)
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public override void WriteLow(ushort addr, byte data)
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{
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//DEBUGOUT( "$%04X:$%02X(%3d) L=%3d\n", addr, data, data, nes.GetScanline() );
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switch (addr & 0xF003)
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{
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case 0x6000:
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case 0x6001:
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case 0x6002:
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case 0x6003:
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SetVROM_2K_Bank((byte)((addr & 0x03) * 2), data);
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break;
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case 0x7000:
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SetPROM_8K_Bank(4, data);
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break;
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case 0x7001:
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SetPROM_8K_Bank(5, data);
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break;
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case 0x7002:
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irq_enable = 0;
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irq_counter = 0;
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0x7003:
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irq_enable = 1;
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break;
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}
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}
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//void Mapper091::HSync(INT scanline)
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public override void HSync(int scanline)
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{
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if ((scanline >= 0 && scanline < 240) && nes.ppu.IsDispON())
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{
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if (irq_enable != 0)
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{
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irq_counter++;
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}
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if (irq_counter >= 8)
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{
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// nes.cpu.IRQ_NotPending();
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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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//void Mapper091::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = irq_enable;
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p[1] = irq_counter;
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}
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//void Mapper091::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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irq_enable = p[0];
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irq_counter = p[1];
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}
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public override bool IsStateSave()
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{
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return true;
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}
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}
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}
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