115 lines
2.6 KiB
C#
115 lines
2.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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// Bad Dudes.7z|Dragon Ninja (J) [p1][!].nes
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// irq doesn't work right; easily seen in any level but level 1
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public sealed class Mapper222 : NES.NESBoardBase
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{
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int prg_bank_mask_8k;
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int chr_bank_mask_1k;
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int[] prg = new int[4];
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int[] chr = new int[8];
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int irq_time = 0;
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bool irq_counting = false;
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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switch (Cart.board_type)
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{
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case "MAPPER222":
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break;
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default:
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return false;
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}
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SetMirrorType(EMirrorType.Vertical);
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prg_bank_mask_8k = Cart.prg_size / 8 - 1;
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chr_bank_mask_1k = Cart.chr_size - 1;
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prg[3] = prg_bank_mask_8k;
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prg[2] = prg[3] - 1;
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return true;
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}
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public override void WritePRG(int addr, byte value)
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{
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addr &= 0x7003;
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switch (addr)
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{
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case 0x0000:
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prg[0] = value & prg_bank_mask_8k;
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break;
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case 0x2000:
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prg[1] = value & prg_bank_mask_8k;
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break;
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case 0x7000:
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case 0x7001:
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// this is of course sort of VRC like... except it doesn't work right
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irq_time = (256 - value) * 113;
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IRQSignal = false;
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irq_counting = false;
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Console.WriteLine("IRQ Set\\Ack: SL {0} val {1}", NES.ppu.ppur.status.sl, value);
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break;
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case 0x7002:
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irq_counting = true;
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Console.WriteLine("IRQ GO: SL {0} val {1}", NES.ppu.ppur.status.sl, value);
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break;
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}
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if (addr >= 0x3000 && addr < 0x7000)
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{
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int b = (addr >> 11) - 6;
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b |= addr >> 1 & 1;
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if ((addr & 1) != 0)
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chr[b] = (chr[b] & 0x0f | value << 4) & chr_bank_mask_1k;
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else
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chr[b] = (chr[b] & 0xf0 | value & 0x0f) & chr_bank_mask_1k;
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}
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}
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public override byte ReadPRG(int addr)
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{
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return ROM[addr & 0x1fff | prg[addr >> 13] << 13];
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}
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public override byte ReadPPU(int addr)
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{
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if (addr < 0x2000)
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return VROM[addr & 0x3ff | chr[addr >> 10] << 10];
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else
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return base.ReadPPU(addr);
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}
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public override void ClockCPU()
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{
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if (irq_counting)
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{
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irq_time--;
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if (irq_time == 0)
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{
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irq_counting = false;
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IRQSignal = true;
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Console.WriteLine("IRQ TRIG: SL {0}", NES.ppu.ppur.status.sl);
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}
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}
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}
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public override void SyncState(Serializer ser)
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{
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ser.Sync("prg", ref prg, false);
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ser.Sync("chr", ref chr, false);
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ser.Sync("irq_time", ref irq_time);
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ser.Sync("irq_counting", ref irq_counting);
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base.SyncState(ser);
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}
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}
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}
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