72 lines
1.7 KiB
C#
72 lines
1.7 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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/*
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Example Games:
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--------------------------
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Quinty (J)
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Namcot Mahjong 3
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Dragon Spirit - Aratanaru Densetsu
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This is the same as Mapper206, with the following exception:
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CHR support is increased to 128KB by connecting PPU's A12 line to the CHR ROM's A16 line.
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For example, mask the CHR ROM 1K bank output from the mapper by $3F, and then OR it with $40 if the PPU address was >= $1000.
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Consequently, CHR is split into two halves. $0xxx can only have CHR from the first 64K, $1xxx can only have CHR from the second 64K.
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*/
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class Mapper088 : Namcot108Board_Base
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{
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//configuration
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int chr_bank_mask_1k;
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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//analyze board type
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switch (Cart.board_type)
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{
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case "NAMCOT-3443":
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case "NAMCOT-3433":
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case "MAPPER088":
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break;
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default:
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return false;
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}
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BaseSetup();
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SetMirrorType(EMirrorType.Vertical);
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chr_bank_mask_1k = Cart.chr_size - 1;
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return true;
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}
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int RewireCHR(int addr)
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{
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int bank_1k = mapper.Get_CHRBank_1K(addr);
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bank_1k &= 0x3F;
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if (addr >= 0x1000)
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bank_1k |= 0x40;
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bank_1k &= chr_bank_mask_1k;
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int ofs = addr & ((1 << 10) - 1);
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addr = (bank_1k << 10) + ofs;
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return 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) return VROM[RewireCHR(addr)];
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else return base.ReadPPU(addr);
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}
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public override void WritePPU(int addr, byte value)
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{
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if (addr < 0x2000) { }
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else base.WritePPU(addr, value);
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}
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}
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}
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