84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2023
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/* NES 2.0 Mapper 439 denotes the YS2309 multicart PCB.
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* Its UNIF MAPRs are BMC-DS-07 and BMC-K86B.
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*/
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#include "mapinc.h"
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#include "latch.h"
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static uint8 reg[2];
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static uint8 pad;
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static void Sync(void)
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{
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setprg16(0x8000, ((reg[0] >> 1) & ~7) | latch.data & 7);
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setprg16(0xC000, ((reg[0] >> 1) & ~7) | 7);
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setchr8(0);
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setmirror(((latch.data >> 7) & 1) ^ 1);
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}
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static DECLFR(M439ReadPad)
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{
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return pad;
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}
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static DECLFW(M439WriteReg)
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{
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reg[A & 1] = V;
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Sync();
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}
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static DECLFW(M439WriteLatch)
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{
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if (!(reg[0] & 0x80))
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latch.data = (latch.data & ~7) | (V & 7);
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else
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latch.data = V;
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Sync();
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}
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static void M439Reset(void)
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{
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pad++;
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reg[0] = reg[1] = ~0;
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LatchHardReset();
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}
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static void M439Power(void)
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{
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pad = 0;
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reg[0] = reg[1] = ~0;
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LatchPower();
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SetReadHandler(0x6000, 0x7FFF, M439ReadPad);
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SetWriteHandler(0x6000, 0x7FFF, M439WriteReg);
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SetWriteHandler(0x8000, 0xFFFF, M439WriteLatch);
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}
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void Mapper439_Init(CartInfo *info)
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{
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Latch_Init(info, Sync, NULL, 0, 1);
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info->Power = M439Power;
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info->Reset = M439Reset;
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AddExState(reg, 2, 0, "REGS");
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AddExState(&pad, 1, 0, "DIPS");
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}
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