104 lines
2.0 KiB
C#
104 lines
2.0 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper042 Mario Baby //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.MMU;
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using static VirtualNes.Core.CPU;
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using INT = System.Int32;
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using BYTE = System.Byte;
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using Codice.CM.Client.Differences;
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namespace VirtualNes.Core
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{
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public class Mapper042 : Mapper
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{
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BYTE irq_enable;
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BYTE irq_counter;
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public Mapper042(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_counter = 0;
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SetPROM_8K_Bank(3, 0);
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SetPROM_32K_Bank(PROM_8K_SIZE - 4, PROM_8K_SIZE - 3, 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 Mapper042::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 & 0xE003)
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{
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case 0xE000:
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SetPROM_8K_Bank(3, data & 0x0F);
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break;
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case 0xE001:
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if ((data & 0x08) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
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else SetVRAM_Mirror(VRAM_VMIRROR);
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break;
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case 0xE002:
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if ((data & 0x02) != 0)
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{
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irq_enable = 0xFF;
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}
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else
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{
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irq_enable = 0;
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irq_counter = 0;
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}
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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 Mapper042::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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if (irq_counter < 215)
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{
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irq_counter++;
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}
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if (irq_counter == 215)
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{
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irq_enable = 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 Mapper042::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 Mapper042::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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