92 lines
1.6 KiB
C#
92 lines
1.6 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper099 VS-Unisystem //
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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 System;
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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 Mapper099 : Mapper
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{
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BYTE coin;
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public Mapper099(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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// set CPU bank pointers
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if (PROM_8K_SIZE > 2)
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{
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SetPROM_32K_Bank(0, 1, 2, 3);
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}
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else if (PROM_8K_SIZE > 1)
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{
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SetPROM_32K_Bank(0, 1, 0, 1);
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}
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else
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{
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SetPROM_32K_Bank(0, 0, 0, 0);
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}
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// set VROM bank
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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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coin = 0;
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}
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//BYTE Mapper099::ExRead(WORD addr)
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public override byte ExRead(ushort addr)
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{
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if (addr == 0x4020)
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{
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return coin;
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}
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return (byte)(addr >> 8);
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}
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//void Mapper099::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 == 0x4016)
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{
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if ((data & 0x04) != 0)
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{
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SetVROM_8K_Bank(1);
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}
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else
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{
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SetVROM_8K_Bank(0);
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}
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if (nes.rom.GetPROM_CRC() == 0xC99EC059)
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{ // VS Raid on Bungeling Bay(J)
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if ((data & 0x02) != 0)
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{
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nes.cpu.SetIRQ(IRQ_MAPPER);
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}
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else
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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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}
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if (addr == 0x4020)
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{
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coin = data;
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}
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}
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}
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}
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