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https://github.com/dborth/fceugx.git
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85 lines
2.3 KiB
C++
85 lines
2.3 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) 2005 CaH4e3
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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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#include "mapinc.h"
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#include "mmc3.h"
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static void M187CW(uint32 A, uint8 V) {
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if ((A & 0x1000) == ((MMC3_cmd & 0x80) << 5))
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setchr1(A, V | 0x100);
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else
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setchr1(A, V);
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}
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static void M187PW(uint32 A, uint8 V) {
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if (EXPREGS[0] & 0x80) {
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uint8 bank = EXPREGS[0] & 0x1F;
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if (EXPREGS[0] & 0x20) {
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if (EXPREGS[0] & 0x40)
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setprg32(0x8000, bank >> 2);
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else
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setprg32(0x8000, bank >> 1); // hacky hacky! two mappers in one! need real hw carts to test
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} else {
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setprg16(0x8000, bank);
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setprg16(0xC000, bank);
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}
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} else
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setprg8(A, V & 0x3F);
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}
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static DECLFW(M187Write8000) {
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EXPREGS[1] = 1;
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MMC3_CMDWrite(A, V);
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}
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static DECLFW(M187Write8001) {
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if (EXPREGS[1])
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MMC3_CMDWrite(A, V);
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}
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static DECLFW(M187WriteLo) {
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if ((A == 0x5000) || (A == 0x6000)) {
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EXPREGS[0] = V;
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FixMMC3PRG(MMC3_cmd);
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}
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}
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static uint8 prot_data[4] = { 0x83, 0x83, 0x42, 0x00 };
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static DECLFR(M187Read) {
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return prot_data[EXPREGS[1] & 3];
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}
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static void M187Power(void) {
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EXPREGS[0] = EXPREGS[1] = 0;
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GenMMC3Power();
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SetReadHandler(0x5000, 0x5FFF, M187Read);
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SetWriteHandler(0x5000, 0x6FFF, M187WriteLo);
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SetWriteHandler(0x8000, 0x8000, M187Write8000);
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SetWriteHandler(0x8001, 0x8001, M187Write8001);
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}
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void Mapper187_Init(CartInfo *info) {
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GenMMC3_Init(info, 256, 256, 0, 0);
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pwrap = M187PW;
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cwrap = M187CW;
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info->Power = M187Power;
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AddExState(EXPREGS, 3, 0, "EXPR");
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}
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