mirror of
https://github.com/dborth/fceugx.git
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110 lines
2.9 KiB
C++
110 lines
2.9 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) 2005 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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* Lethal Weapon (VRC4 mapper)
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*/
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#include "mapinc.h"
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static uint8 prg0, prg1, mirr, swap;
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static uint8 chr[8];
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static uint8 IRQCount;
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static uint8 IRQPre;
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static uint8 IRQa;
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static SFORMAT StateRegs[] =
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{
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{ &prg0, 1, "PRG0" },
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{ &prg0, 1, "PRG1" },
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{ &mirr, 1, "MIRR" },
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{ &swap, 1, "SWAP" },
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{ chr, 8, "CHR" },
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{ &IRQCount, 1, "IRQC" },
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{ &IRQPre, 1, "IRQP" },
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{ &IRQa, 1, "IRQA" },
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{ 0 }
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};
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static void SyncPrg(void) {
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if (swap & 3) {
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setprg8(0x8000, ~1);
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setprg8(0xC000, prg0);
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} else {
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setprg8(0x8000, prg0);
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setprg8(0xC000, ~1);
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}
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setprg8(0xA000, prg1);
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setprg8(0xE000, ~0);
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}
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static void SyncChr(void) {
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int i;
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for (i = 0; i < 8; i++)
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setchr1(i << 10, chr[i]);
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setmirror(mirr ^ 1);
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}
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static void StateRestore(int version) {
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SyncPrg();
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SyncChr();
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}
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static DECLFW(UNLTF1201Write) {
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A = (A & 0xF003) | ((A & 0xC) >> 2);
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if ((A >= 0xB000) && (A <= 0xE003)) {
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int ind = (((A >> 11) - 6) | (A & 1)) & 7;
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int sar = ((A & 2) << 1);
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chr[ind] = (chr[ind] & (0xF0 >> sar)) | ((V & 0x0F) << sar);
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SyncChr();
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} else switch (A & 0xF003) {
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case 0x8000: prg0 = V; SyncPrg(); break;
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case 0xA000: prg1 = V; SyncPrg(); break;
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case 0x9000: mirr = V & 1; SyncChr(); break;
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case 0x9001: swap = V & 3; SyncPrg(); break;
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case 0xF000: IRQCount = ((IRQCount & 0xF0) | (V & 0xF)); break;
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case 0xF002: IRQCount = ((IRQCount & 0x0F) | ((V & 0xF) << 4)); break;
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case 0xF001:
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case 0xF003: IRQa = V & 2; X6502_IRQEnd(FCEU_IQEXT); if (scanline < 240) IRQCount -= 8; break;
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}
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}
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static void UNLTF1201IRQCounter(void) {
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if (IRQa) {
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IRQCount++;
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if (IRQCount == 237) {
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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}
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static void UNLTF1201Power(void) {
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IRQPre = IRQCount = IRQa = 0;
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, UNLTF1201Write);
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SyncPrg();
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SyncChr();
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}
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void UNLTF1201_Init(CartInfo *info) {
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info->Power = UNLTF1201Power;
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GameHBIRQHook = UNLTF1201IRQCounter;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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