96 lines
2.2 KiB
C#
96 lines
2.2 KiB
C#
using System;
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using System.IO;
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using System.Diagnostics;
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namespace BizHawk.Emulation.Consoles.Nintendo
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{
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//mapper 011
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//Crystal Mines
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//Metal Fighter
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public class IC_74x377 : NES.NESBoardBase
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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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bool bus_conflict = true;
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bool bus_conflict_50282 = false;
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//state
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int prg_bank_32k, chr_bank_8k;
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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 "MAPPER011":
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break;
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case "Discrete_74x377-FLEX":
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break;
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case "COLORDREAMS-74*377":
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AssertPrg(32,64,128); AssertChr(16,32,64,128); AssertVram(0); AssertWram(0);
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break;
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case "AGCI-50282": // death race
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case "MAPPER144":
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bus_conflict_50282 = true;
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bus_conflict = false;
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SetMirrorType(Cart.pad_h, Cart.pad_v);
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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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return true;
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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 + (prg_bank_32k << 15)];
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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 << 13)];
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}
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else return base.ReadPPU(addr);
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}
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public override void WritePRG(int addr, byte value)
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{
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if (bus_conflict_50282)
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{
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// this is what fceux does
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//if (addr == 0)
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// return;
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// this is what nesdev wiki does. seems to give same results as above?
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value = (byte)((value | 1) & ReadPRG(addr));
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}
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if (bus_conflict)
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{
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byte old_value = value;
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value &= ReadPRG(addr);
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//Bible Adventures (Unl) (V1.3) [o1].nes will exercise this bus conflict, but not really test it. (works without bus conflict emulation
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Debug.Assert(old_value == value, "Found a test case of Discrete_74x377 bus conflict. please report.");
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}
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prg_bank_32k = (value & 3) & prg_bank_mask_32k;
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chr_bank_8k = ((value >> 4) & 0xF) & chr_bank_mask_8k;
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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", ref prg_bank_32k);
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ser.Sync("chr_bank_8k", ref chr_bank_8k);
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}
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}
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} |