72 lines
1.7 KiB
C#
72 lines
1.7 KiB
C#
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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, masking the CHR ROM address output from the mapper by $FFFF, and then OR it with $10000 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_byte_mask;
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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": //TODO: just a guess, find a ROM with this
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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_byte_mask = (Cart.chr_size*1024) - 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 chrrom_addr = base.MapCHR(addr);
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chrrom_addr &= 0xFFFF;
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if (addr >= 0x1000)
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chrrom_addr |= 0x10000;
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chrrom_addr &= chr_byte_mask;
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return chrrom_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[Get_CHRBank_1K(addr)];
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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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