91 lines
2.3 KiB
C#
91 lines
2.3 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper040 SMB2J //
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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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using INT = System.Int32;
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namespace VirtualNes.Core
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{
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public class Mapper040 : Mapper
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{
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BYTE irq_enable;
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INT irq_line;
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public Mapper040(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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irq_enable = 0;
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irq_line = 0;
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SetPROM_8K_Bank(3, 6);
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SetPROM_32K_Bank(4, 5, 0, 7);
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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 Mapper040::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 & 0xE000)
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{
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case 0x8000:
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irq_enable = 0;
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0xA000:
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irq_enable = 0xFF;
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irq_line = 37;
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0xC000:
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break;
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case 0xE000:
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SetPROM_8K_Bank(6, data & 0x07);
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break;
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}
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}
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//void Mapper040::HSync(INT scanline)
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public override void HSync(int scanline)
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{
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if (irq_enable != 0)
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{
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if (--irq_line <= 0)
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{
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// nes.cpu.IRQ();
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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 Mapper040::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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//*(INT*)&p[1] = irq_line;
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}
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//void Mapper040::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_line = *(INT*)&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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