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https://github.com/dborth/fceugx.git
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109 lines
2.8 KiB
C++
109 lines
2.8 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) 2007 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 reg[16], IRQa;
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static uint32 IRQCount;
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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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{ &IRQa, 1, "IRQA" },
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{ &IRQCount, 4, "IRQC" },
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{ reg, 16, "REGS" },
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{ 0 }
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};
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static void Sync(void) {
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setchr1(0x0000, reg[0] & 0xfe);
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setchr1(0x0400, reg[1] | 1);
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setchr1(0x0800, reg[2] & 0xfe);
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setchr1(0x0c00, reg[3] | 1);
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setchr1(0x1000, reg[4]);
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setchr1(0x1400, reg[5]);
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setchr1(0x1800, reg[6]);
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setchr1(0x1c00, reg[7]);
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setprg8r(0x10, 0x6000, 0);
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setprg8(0x8000, (reg[0x8] & 0xf) | 0x10);
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setprg8(0xA000, (reg[0x9] & 0x1f));
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setprg8(0xC000, (reg[0xa] & 0x1f));
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setprg8(0xE000, (reg[0xb] & 0xf) | 0x10);
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setmirror((reg[0xc] & 1) ^ 1);
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}
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static DECLFW(M106Write) {
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A &= 0xF;
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switch (A) {
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case 0xD: IRQa = 0; IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0xE: IRQCount = (IRQCount & 0xFF00) | V; break;
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case 0xF: IRQCount = (IRQCount & 0x00FF) | (V << 8); IRQa = 1; break;
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default: reg[A] = V; Sync(); break;
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}
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}
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static void M106Power(void) {
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reg[8] = reg[9] = reg[0xa] = reg[0xb] = -1;
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Sync();
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SetReadHandler(0x6000, 0x7FFF, CartBR);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetWriteHandler(0x8000, 0xFFFF, M106Write);
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}
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static void M106Reset(void) {
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}
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static void M106Close(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 M106CpuHook(int a) {
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if (IRQa) {
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IRQCount += a;
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if (IRQCount > 0x10000) {
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa = 0;
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}
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}
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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 Mapper106_Init(CartInfo *info) {
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info->Reset = M106Reset;
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info->Power = M106Power;
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info->Close = M106Close;
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MapIRQHook = M106CpuHook;
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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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AddExState(WRAM, WRAMSIZE, 0, "WRAM");
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AddExState(&StateRegs, ~0, 0, 0);
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}
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