156 lines
3.6 KiB
C#
156 lines
3.6 KiB
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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//AKA mapper 67
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//this may be confusing due to general chaos with the early sunsoft mappers. see docs/sunsoft.txt
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public sealed class Sunsoft3 : NES.NESBoardBase
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{
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//configuration
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int prg_bank_mask_16k, chr_bank_mask_2k;
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//state
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bool toggle;
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ByteBuffer prg_banks_16k = new ByteBuffer(2);
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ByteBuffer chr_banks_2k = new ByteBuffer(4);
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int irq_counter;
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bool irq_enable;
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bool irq_asserted;
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int clock_counter;
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public override void SyncState(Serializer ser)
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{
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base.SyncState(ser);
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ser.Sync("toggle", ref toggle);
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ser.Sync("prg_banks_16k", ref prg_banks_16k);
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ser.Sync("chr_banks_2k", ref chr_banks_2k);
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ser.Sync("irq_counter", ref irq_counter);
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ser.Sync("irq_enable", ref irq_enable);
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ser.Sync("irq_asserted", ref irq_asserted);
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ser.Sync("clock_counter", ref clock_counter);
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SyncIRQ();
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}
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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 "MAPPER067":
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break;
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case "SUNSOFT-3":
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AssertPrg(128); AssertChr(128);
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break;
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default:
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return false;
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}
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prg_bank_mask_16k = (Cart.prg_size / 16) - 1;
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chr_bank_mask_2k = (Cart.chr_size / 2) - 1;
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prg_banks_16k[0] = 0;
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prg_banks_16k[1] = 0xFF;
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ApplyMemoryMapMask(prg_bank_mask_16k, prg_banks_16k);
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return true;
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}
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void SetCHR(int block, byte value)
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{
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chr_banks_2k[block] = value;
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ApplyMemoryMapMask(chr_bank_mask_2k, chr_banks_2k);
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}
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void SyncIRQ()
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{
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IRQSignal = irq_asserted;
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}
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public override void WritePRG(int addr, byte value)
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{
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//Console.WriteLine("{0:X4} = {1:X2}", addr, value);
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switch (addr & 0xF800)
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{
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case 0x0800: //0x8800
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SetCHR(0, value);
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break;
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case 0x1800: //0x9800
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SetCHR(1, value);
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break;
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case 0x2800: //0xA800
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SetCHR(2, value);
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break;
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case 0x3800: //0xB800
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SetCHR(3, value);
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break;
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case 0x4800: //0xC800
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if (!toggle)
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irq_counter = (irq_counter & 0xFF) | (value << 8);
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else irq_counter = (irq_counter & 0xFF00) | (value);
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toggle ^= true;
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break;
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case 0x5800: //0xD800
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irq_enable = value.Bit(4);
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toggle = false;
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irq_asserted = false;
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SyncIRQ();
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break;
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case 0x6800: //0xE800:
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switch (value & 3)
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{
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case 0: SetMirrorType(NES.NESBoardBase.EMirrorType.Vertical); break;
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case 1: SetMirrorType(NES.NESBoardBase.EMirrorType.Horizontal); break;
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case 2: SetMirrorType(NES.NESBoardBase.EMirrorType.OneScreenA); break;
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case 3: SetMirrorType(NES.NESBoardBase.EMirrorType.OneScreenB); break;
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}
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break;
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case 0x7800: //0xF800:
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prg_banks_16k[0] = value;
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ApplyMemoryMapMask(prg_bank_mask_16k, prg_banks_16k);
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break;
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}
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}
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public override void ClockCPU()
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{
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if (!irq_enable) return;
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if (irq_counter == 0)
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{
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irq_counter = 0xFFFF;
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//Console.WriteLine("IRQ!!!");
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irq_asserted = true;
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SyncIRQ();
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irq_enable = false;
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}
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else irq_counter--;
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}
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public override byte ReadPRG(int addr)
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{
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addr = ApplyMemoryMap(14, prg_banks_16k, addr);
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return ROM[addr];
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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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{
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addr = ApplyMemoryMap(11, chr_banks_2k, addr);
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return base.ReadPPUChr(addr);
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}
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else return base.ReadPPU(addr);
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}
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/*
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public override void ClockPPU()
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{
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clock_counter++;
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if (clock_counter == 3)
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{
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clock_counter = 0;
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ClockCPU();
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}
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}*/
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}
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}
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