115 lines
2.8 KiB
C#
115 lines
2.8 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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namespace BizHawk.Emulation.Consoles.Nintendo
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{
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//iNES Mapper 72
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//Example Games:
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//--------------------------
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//Pinball Quest (J)
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//Moero!! Pro Tennis
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//Moero!! Juudou Warriors
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//based on the chips on the pcb (3x 4bit registers and some OR gates) i'm gonna speculate something a little different about how this works.
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//there isnt enough memory for 2 bank registers, a latched bank, and a latched command. so i think the bank isnt latched--the command is latched.
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//when the top 2 bits are 0, then the low 4 bits are written to the register specified by the latch
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//when the top 2 bits arent 0, theyre written to the latch
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//interestingly, this works (for pinball quest) only when bus conflicts are applied, otherwise the game cant get past the title
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class JALECO_JF_17 : NES.NESBoardBase
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{
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//configuration
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int prg_bank_mask_16k;
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int chr_bank_mask_8k;
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//state
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int latch;
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ByteBuffer prg_banks_16k = new ByteBuffer(2);
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ByteBuffer chr_banks_8k = new ByteBuffer(1);
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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 "MAPPER072":
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break;
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case "JALECO-JF-17":
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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_8k = (Cart.chr_size / 8) - 1;
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SetMirrorType(Cart.pad_h, Cart.pad_v);
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prg_banks_16k[1] = 0xFF;
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chr_banks_8k[0] = 0;
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SyncMap();
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return true;
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}
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void SyncMap()
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{
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ApplyMemoryMapMask(prg_bank_mask_16k, prg_banks_16k);
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ApplyMemoryMapMask(chr_bank_mask_8k, chr_banks_8k);
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}
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public override void Dispose()
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{
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prg_banks_16k.Dispose();
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base.Dispose();
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}
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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("latch", ref latch);
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ser.Sync("prg_banks_16k", ref prg_banks_16k);
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ser.Sync("chr_banks_8k", ref chr_banks_8k);
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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("MAP {0:X4} = {1:X2}", addr, value);
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value = HandleNormalPRGConflict(addr, value);
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int command = value >> 6;
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switch (command)
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{
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case 0:
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if (latch == 1)
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chr_banks_8k[0] = (byte)(value & 0xF);
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else if (latch == 2)
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prg_banks_16k[0] = (byte)(value & 0xF);
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SyncMap();
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break;
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default:
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latch = command;
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break;
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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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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(13, chr_banks_8k, 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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}
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