mirror of
https://github.com/dborth/fceugx.git
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115 lines
2.7 KiB
C++
115 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) 2009 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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static uint8 chrlo[8], chrhi[8], prg, mirr, mirrisused = 0;
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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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{ &prg, 1, "PREG" },
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{ chrlo, 8, "CRGL" },
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{ chrhi, 8, "CRGH" },
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{ &mirr, 1, "MIRR" },
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{ 0 }
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};
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static void Sync(void) {
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uint32 i;
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for (i = 0; i < 8; i++)
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setchr1(i << 10, chrlo[i] | (chrhi[i] << 8));
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setprg8r(0x10, 0x6000, 0);
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setprg16(0x8000, prg);
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setprg16(0xC000, ~0);
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if (mirrisused)
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setmirror(mirr ^ 1);
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else
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setmirror(MI_0);
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}
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static DECLFW(M156Write) {
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switch (A) {
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case 0xC000:
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case 0xC001:
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case 0xC002:
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case 0xC003: chrlo[A & 3] = V; Sync(); break;
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case 0xC004:
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case 0xC005:
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case 0xC006:
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case 0xC007: chrhi[A & 3] = V; Sync(); break;
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case 0xC008:
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case 0xC009:
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case 0xC00A:
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case 0xC00B: chrlo[4 + (A & 3)] = V; Sync(); break;
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case 0xC00C:
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case 0xC00D:
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case 0xC00E:
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case 0xC00F: chrhi[4 + (A & 3)] = V; Sync(); break;
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case 0xC010: prg = V; Sync(); break;
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case 0xC014: mirr = V; mirrisused = 1; Sync(); break;
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}
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}
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static void M156Reset(void) {
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uint32 i;
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for (i = 0; i < 8; i++) {
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chrlo[i] = 0;
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chrhi[i] = 0;
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}
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prg = 0;
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mirr = 0;
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mirrisused = 0;
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}
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static void M156Power(void) {
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M156Reset();
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Sync();
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetWriteHandler(0xC000, 0xCFFF, M156Write);
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FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
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}
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static void M156Close(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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static void StateRestore(int version) {
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Sync();
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}
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void Mapper156_Init(CartInfo *info) {
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info->Reset = M156Reset;
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info->Power = M156Power;
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info->Close = M156Close;
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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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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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