120 lines
3.4 KiB
C
120 lines
3.4 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) 2002 Xodnizel
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* Copyright (C) 2005 CaH4e3
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* Copyright (C) 2019 Libretro Team
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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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/* Waixing FS304 PCB */
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#include "mapinc.h"
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static uint8 *WRAM;
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static uint32 WRAMSIZE;
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static uint8 reg[4];
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static SFORMAT StateRegs[] =
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{
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{ reg, 4, "REGS" },
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{ 0 }
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};
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static void sync()
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{
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setprg32(0x8000, reg[2] <<4 | reg[0] &0x0C /* PRG A17-A20 always normal from $5000 and $5200 */
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| ( reg[3] &0x04 ? 0x00 : 0x02) /* PRG A16 is 1 if $5300.2=0 */
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| ( reg[3] &0x04 ?(reg[0] &0x02): 0x00) /* PRG A16 is $5000.1 if %5300.2=1 */
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| ( reg[3] &0x01? 0x00 : reg[1] >>1 &0x01) /* PRG A15 is $5100.1 if $5300.0=0 */
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| (~reg[3] &0x04 && reg[3] &0x01? 0x01 : 0x00) /* PRG A15 is 1 if $5300.2=0 and $5300.0=1 */
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| ( reg[3] &0x04 && reg[3] &0x01?(reg[0] &0x01): 0x00) /* PRG A15 is $5000.0 if $5300.2=1 and $5300.0=1 */
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);
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setprg8r(0x10, 0x6000, 0);
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if (~reg[0] &0x80)
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setchr8(0);
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}
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static void hblank(void) {
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if (reg[0] &0x80 && scanline <239)
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{ /* Actual hardware cannot look at the current scanline number, but instead latches PA09 on PA13 rises. This does not seem possible with the current PPU emulation however. */
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setchr4(0x0000, scanline >=127? 1: 0);
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setchr4(0x1000, scanline >=127? 1: 0);
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}
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else
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setchr8(0);
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}
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static DECLFR(readReg)
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{
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return 0x00;
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}
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static DECLFW(writeReg)
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{
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reg[A >>8 &3] = V;
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sync();
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}
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static void power(void)
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{
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memset(reg, 0, sizeof(reg));
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sync();
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SetReadHandler (0x5000, 0x57FF, readReg);
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SetWriteHandler(0x5000, 0x57FF, writeReg);
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SetReadHandler (0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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}
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static void reset(void)
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{
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memset(reg, 0, sizeof(reg));
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sync();
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}
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static void close(void)
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{
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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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{
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sync();
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}
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void Mapper162_Init (CartInfo *info)
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{
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info->Power = power;
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info->Reset = reset;
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info->Close = close;
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GameHBIRQHook = hblank;
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GameStateRestore = StateRestore;
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AddExState(StateRegs, ~0, 0, 0);
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WRAMSIZE = info->iNES2? (info->PRGRamSize + info->PRGRamSaveSize): 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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FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
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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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}
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