mirror of
https://github.com/dborth/fceugx.git
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111 lines
2.7 KiB
C++
111 lines
2.7 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) 2006 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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*/
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#include "mapinc.h"
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static uint16 latchea;
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static uint8 latched;
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static uint8 *WRAM = NULL;
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static uint32 WRAMSIZE;
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static SFORMAT StateRegs[] =
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{
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{ &latchea, 2, "AREG" },
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{ &latched, 1, "DREG" },
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{ 0 }
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};
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static void Sync(void) {
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int i;
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setmirror(((latched >> 6) & 1) ^ 1);
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switch (latchea) {
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case 0x8000:
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for (i = 0; i < 4; i++)
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setprg8(0x8000 + (i << 13), (((latched & 0x7F) << 1) + i) ^ (latched >> 7));
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break;
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case 0x8002:
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for (i = 0; i < 4; i++)
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setprg8(0x8000 + (i << 13), ((latched & 0x7F) << 1) + (latched >> 7));
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break;
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case 0x8001:
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case 0x8003:
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for (i = 0; i < 4; i++) {
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unsigned int b;
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b = latched & 0x7F;
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if (i >= 2 && !(latchea & 0x2))
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b = 0x7F;
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setprg8(0x8000 + (i << 13), (i & 1) + ((b << 1) ^ (latched >> 7)));
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}
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break;
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}
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}
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static DECLFW(M15Write) {
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latchea = A;
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latched = V;
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Sync();
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}
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static void StateRestore(int version) {
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Sync();
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}
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static void M15Power(void) {
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latchea = 0x8000;
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latched = 0;
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setchr8(0);
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setprg8r(0x10, 0x6000, 0);
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetWriteHandler(0x8000, 0xFFFF, M15Write);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
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Sync();
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}
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static void M15Reset(void) {
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latchea = 0x8000;
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latched = 0;
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Sync();
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}
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static void M15Close(void) {
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if (WRAM)
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FCEU_gfree(WRAM);
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WRAM = NULL;
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}
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void Mapper15_Init(CartInfo *info) {
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info->Power = M15Power;
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info->Reset = M15Reset;
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info->Close = M15Close;
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GameStateRestore = StateRestore;
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WRAMSIZE = 8192;
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WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
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SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
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if (info->battery) {
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info->SaveGame[0] = WRAM;
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info->SaveGameLen[0] = WRAMSIZE;
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}
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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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AddExState(&StateRegs, ~0, 0, 0);
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}
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