128 lines
2.6 KiB
C#
128 lines
2.6 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 Mapper233 : 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 233 =
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========================
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Example Game:
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--------------------------
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???? "42-in-1" ????
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Notes:
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---------------------------
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Sources report this mapper as "42-in-1" with description layed out below. I did not test this,
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since I could not find a copy of the ROM in question. The only ROM I have that's marked as
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233 is "Unknown Multicart 1", and it does *not* follow the description in this doc at all.
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There is a "Super 42-in-1"... but that is mapper 226. 226, by the way, is strikingly similar
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to the below description. I wonder if below description really applies to 233?
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Registers:
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---------------------------
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$8000-FFFF: [MMOP PPPP]
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M = Mirroring
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O = PRG Mode
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P = PRG Page
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PRG Setup:
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---------------------------
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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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Mirroring:
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---------------------------
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'M' mirroring bits:
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%00 = See below
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%01 = Vert
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%10 = Horz
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%11 = 1ScB
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Mode %00 (almost, but not quite 1ScA):
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[ NTA ][ NTA ]
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[ NTA ][ NTB ]
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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 "MAPPER233":
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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_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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prg_page = value & 0x1F;
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prg_mode = value.Bit(5);
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int mirror = value >> 6;
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switch (mirror)
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{
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case 0:
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SetMirroring(0, 0, 0, 1);
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break;
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case 1:
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SetMirrorType(EMirrorType.Vertical);
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break;
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case 2:
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SetMirrorType(EMirrorType.Horizontal);
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break;
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case 3:
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SetMirrorType(EMirrorType.OneScreenB);
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break;
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}
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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 & 0x3FFF)];
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}
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}
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}
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}
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