142 lines
3.8 KiB
C#
142 lines
3.8 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper043 SMB2J //
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//////////////////////////////////////////////////////////////////////////
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using System;
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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 Mapper043 : Mapper
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{
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BYTE irq_enable;
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INT irq_counter;
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public Mapper043(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 = 0xFF;
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irq_counter = 0;
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SetPROM_8K_Bank(3, 2);
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SetPROM_32K_Bank(1, 0, 4, 9);
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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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//BYTE Mapper043::ReadLow(WORD addr)
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public override byte ReadLow(ushort addr)
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{
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if (0x5000 <= addr && addr < 0x6000)
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{
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byte[] pPtr = nes.rom.GetPROM();
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return pPtr[0x2000 * 8 + 0x1000 + (addr - 0x5000)];
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}
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return (BYTE)(addr >> 8);
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}
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//void Mapper043::ExWrite(WORD addr, BYTE data)
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public override void ExWrite(ushort addr, byte data)
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{
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if ((addr & 0xF0FF) == 0x4022)
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{
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switch (data & 0x07)
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{
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case 0x00:
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case 0x02:
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case 0x03:
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case 0x04:
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SetPROM_8K_Bank(6, 4);
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break;
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case 0x01:
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SetPROM_8K_Bank(6, 3);
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break;
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case 0x05:
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SetPROM_8K_Bank(6, 7);
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break;
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case 0x06:
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SetPROM_8K_Bank(6, 5);
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break;
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case 0x07:
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SetPROM_8K_Bank(6, 6);
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break;
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}
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}
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}
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//void Mapper043::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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if ((addr & 0xF0FF) == 0x4022)
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{
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ExWrite(addr, data);
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}
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}
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//void Mapper043::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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if (addr == 0x8122)
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{
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if ((data & 0x03) != 0)
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{
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irq_enable = 1;
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}
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else
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{
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irq_counter = 0;
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irq_enable = 0;
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}
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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}
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}
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//void Mapper043::HSync(INT scanline)
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public override void HSync(int scanline)
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{
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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if (irq_enable != 0)
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{
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irq_counter += 341;
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if (irq_counter >= 12288)
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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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}
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}
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}
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//void Mapper043::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_counter;
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BitConverter.GetBytes(irq_counter).CopyTo(p, 1);
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}
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//void Mapper043::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 = *(INT*)&p[1];
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irq_counter = BitConverter.ToInt32(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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