87 lines
1.9 KiB
C#
87 lines
1.9 KiB
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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public sealed class Mapper046 : NES.NESBoardBase
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{
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//Rumblestation 15-in-1 (Unl).nes
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/*
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Regs at $6000-7FFF means no PRG-RAM.
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$6000-7FFF: [CCCC PPPP] High CHR, PRG bits
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$8000-FFFF: [.CCC ...P] Low CHR, PRG bits
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'C' selects 8k CHR @ $0000
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'P' select 32k PRG @ $8000
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*/
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//configuration
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int prg_bank_mask_32k, chr_bank_mask_8k;
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//state
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int prg_bank_32k_H, prg_bank_32k_L,
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chr_bank_8k_H, chr_bank_8k_L;
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public override void WriteWRAM(int addr, byte value)
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{
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prg_bank_32k_H = value & 0x0F;
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chr_bank_8k_H = value >> 4;
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}
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public override void WritePRG(int addr, byte value)
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{
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prg_bank_32k_L = value & 0x01;
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chr_bank_8k_L = (value >> 4) & 0x07;
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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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return VROM[addr + (((chr_bank_8k_H << 3) + chr_bank_8k_L) * 0x2000)];
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}
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else return base.ReadPPU(addr);
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}
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public override byte ReadPRG(int addr)
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{
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//TODO: High bits
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int offset = (prg_bank_32k_H << 1) + prg_bank_32k_L;
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return ROM[addr + (offset * 0x8000)];
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}
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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//configure
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switch (Cart.board_type)
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{
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case "MAPPER046":
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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_32k = Cart.prg_size / 32 - 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_bank_32k_H = 0;
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prg_bank_32k_L = 0;
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chr_bank_8k_H = 0;
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chr_bank_8k_L = 0;
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return true;
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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("prg_bank_32k_H", ref prg_bank_32k_H);
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ser.Sync("prg_bank_32k_L", ref prg_bank_32k_L);
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ser.Sync("chr_bank_8k_H", ref chr_bank_8k_H);
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ser.Sync("chr_bank_8k_L", ref chr_bank_8k_L);
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}
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}
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}
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