97 lines
1.9 KiB
C#
97 lines
1.9 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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class Mapper61 : NES.NESBoardBase
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{
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/*
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* Here are Disch's original notes:
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========================
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= Mapper 061 =
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========================
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Example Game:
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--------------------------
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20-in-1
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Registers:
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---------------------------
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$8000-FFFF: A~[.... .... M.LO HHHH]
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H = High 4 bits of PRG Reg
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L = Low bit of PRG Reg
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O = PRG Mode
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M = Mirroring (0=Vert, 1=Horz)
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PRG Setup:
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---------------------------
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PRG Reg is 5 bits -- combination of 'H' and 'L' bits.
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$8000 $A000 $C000 $E000
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+-------------------------------+
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PRG Mode 0: | <$8000> |
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+-------------------------------+
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PRG Mode 1: | $8000 | $8000 |
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+---------------+---------------+
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*/
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public int prg_page;
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public bool prg_mode;
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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 "MAPPER061":
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break;
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default:
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return false;
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}
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SetMirrorType(EMirrorType.Vertical);
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prg_page = 0;
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prg_mode = false;
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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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ser.Sync("prg_page", ref prg_page);
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ser.Sync("prg_mode", ref prg_mode);
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base.SyncState(ser);
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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 (addr.Bit(7))
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{
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SetMirrorType(EMirrorType.Horizontal);
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}
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else
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{
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SetMirrorType(EMirrorType.Vertical);
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}
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prg_mode = addr.Bit(4);
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prg_page = ((addr & 0x0F) << 1) | ((addr & 0x20) >> 5);
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}
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public override byte ReadPRG(int addr)
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{
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if (prg_mode == false)
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{
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return ROM[((prg_page >> 1) * 0x8000) + addr];
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}
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else
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{
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return ROM[(prg_page * 0x4000) + (addr & 0x03FFF)];
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}
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}
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}
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}
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