119 lines
3.4 KiB
C#
119 lines
3.4 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper117 Sanko Gu(Tw) //
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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 Mapper117 : Mapper
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{
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BYTE irq_enable;
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BYTE irq_counter;
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public Mapper117(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(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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if (VROM_1K_SIZE != 0)
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{
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SetVROM_8K_Bank(0);
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}
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}
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//void Mapper117::Write(WORD addr, BYTE data)
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public override void Write(ushort addr, byte data)
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{
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switch (addr)
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{
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case 0x8000:
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SetPROM_8K_Bank(4, data);
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break;
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case 0x8001:
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SetPROM_8K_Bank(5, data);
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break;
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case 0x8002:
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SetPROM_8K_Bank(6, data);
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break;
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case 0xA000:
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SetVROM_1K_Bank(0, data);
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break;
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case 0xA001:
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SetVROM_1K_Bank(1, data);
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break;
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case 0xA002:
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SetVROM_1K_Bank(2, data);
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break;
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case 0xA003:
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SetVROM_1K_Bank(3, data);
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break;
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case 0xA004:
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SetVROM_1K_Bank(4, data);
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break;
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case 0xA005:
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SetVROM_1K_Bank(5, data);
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break;
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case 0xA006:
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SetVROM_1K_Bank(6, data);
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break;
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case 0xA007:
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SetVROM_1K_Bank(7, data);
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break;
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case 0xC001:
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case 0xC002:
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case 0xC003:
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irq_counter = data;
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break;
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case 0xE000:
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irq_enable = (byte)(data & 1);
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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 Mapper117::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 <= 239))
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{
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if (nes.ppu.IsDispON())
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{
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if (irq_enable != 0)
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{
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if (irq_counter == scanline)
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{
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irq_counter = 0;
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// nes.cpu.IRQ();
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// nes.cpu.SetIRQ( IRQ_MAPPER );
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nes.cpu.SetIRQ(IRQ_TRIGGER);
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}
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}
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}
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}
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}
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//void Mapper117::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = irq_counter;
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p[1] = irq_enable;
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}
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//void Mapper117::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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irq_counter = p[0];
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irq_enable = 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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