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80 lines
2.7 KiB
C++
80 lines
2.7 KiB
C++
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2015 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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* "Dragon Fighter" protected MMC3 based custom mapper board
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* mostly hacky implementation, I can't verify if this mapper can read a RAM of the
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* console or watches the bus writes somehow.
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*
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*/
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#include "mapinc.h"
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#include "mmc3.h"
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static void UNLBMW8544PW(uint32 A, uint8 V) {
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if(A == 0x8000)
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setprg8(A,EXPREGS[0] & 0x1F); // the real hardware has this bank overrided with it's own register,
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else // but MMC3 prg swap still works and you can actually change bank C000 at the same time if use 0x46 cmd
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setprg8(A,V);
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}
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static void UNLBMW8544CW(uint32 A, uint8 V) {
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if(A == 0x0000)
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setchr2(0x0000,(V >> 1) ^ EXPREGS[1]);
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else if (A == 0x0800)
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setchr2(0x0800,(V >> 1) | ((EXPREGS[2] & 0x40) << 1));
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else if (A == 0x1000)
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setchr4(0x1000, EXPREGS[2] & 0x3F);
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}
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static DECLFW(UNLBMW8544ProtWrite) {
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if(!(A & 1)) {
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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 DECLFR(UNLBMW8544ProtRead) {
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if(!fceuindbg) {
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if(!(A & 1)) {
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if((EXPREGS[0] & 0xE0) == 0xC0) {
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EXPREGS[1] = ARead[0x6a](0x6a); // program can latch some data from the BUS, but I can't say how exactly,
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} else { // without more euipment and skills ;) probably here we can try to get any write
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EXPREGS[2] = ARead[0xff](0xff); // before the read operation
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}
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FixMMC3CHR(MMC3_cmd & 0x7F); // there are more different behaviour of the board isn't used by game itself, so unimplemented here and
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} // actually will break the current logic ;)
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}
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return 0;
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}
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static void UNLBMW8544Power(void) {
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GenMMC3Power();
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SetWriteHandler(0x6000, 0x6FFF, UNLBMW8544ProtWrite);
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SetReadHandler(0x6000, 0x6FFF, UNLBMW8544ProtRead);
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}
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void UNLBMW8544_Init(CartInfo *info) {
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GenMMC3_Init(info, 128, 256, 0, 0);
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pwrap = UNLBMW8544PW;
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cwrap = UNLBMW8544CW;
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info->Power = UNLBMW8544Power;
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AddExState(EXPREGS, 3, 0, "EXPR");
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}
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