mirror of
https://github.com/dborth/fceugx.git
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108 lines
2.9 KiB
C++
108 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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#include "mapinc.h"
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#include "mmc3.h"
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static uint8 chrcmd[8], prg0, prg1, bbrk, mirr, swap;
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static SFORMAT StateRegs[] =
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{
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{ chrcmd, 8, "CHRC" },
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{ &prg0, 1, "PRG0" },
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{ &prg1, 1, "PRG1" },
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{ &bbrk, 1, "BRK" },
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{ &mirr, 1, "MIRR" },
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{ &swap, 1, "SWAP" },
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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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setprg8(0x8000, prg0);
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setprg8(0xA000, prg1);
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setprg8(0xC000, ~1);
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setprg8(0xE000, ~0);
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for (i = 0; i < 8; i++)
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setchr1(i << 10, chrcmd[i]);
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setmirror(mirr ^ 1);
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}
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static void UNLSL1632CW(uint32 A, uint8 V) {
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int cbase = (MMC3_cmd & 0x80) << 5;
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int page0 = (bbrk & 0x08) << 5;
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int page1 = (bbrk & 0x20) << 3;
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int page2 = (bbrk & 0x80) << 1;
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setchr1(cbase ^ 0x0000, page0 | (DRegBuf[0] & (~1)));
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setchr1(cbase ^ 0x0400, page0 | DRegBuf[0] | 1);
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setchr1(cbase ^ 0x0800, page0 | (DRegBuf[1] & (~1)));
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setchr1(cbase ^ 0x0C00, page0 | DRegBuf[1] | 1);
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setchr1(cbase ^ 0x1000, page1 | DRegBuf[2]);
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setchr1(cbase ^ 0x1400, page1 | DRegBuf[3]);
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setchr1(cbase ^ 0x1800, page2 | DRegBuf[4]);
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setchr1(cbase ^ 0x1c00, page2 | DRegBuf[5]);
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}
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static DECLFW(UNLSL1632CMDWrite) {
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if (A == 0xA131) {
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bbrk = V;
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}
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if (bbrk & 2) {
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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if (A < 0xC000)
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MMC3_CMDWrite(A, V);
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else
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MMC3_IRQWrite(A, V);
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} else {
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if ((A >= 0xB000) && (A <= 0xE003)) {
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int ind = ((((A & 2) | (A >> 10)) >> 1) + 2) & 7;
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int sar = ((A & 1) << 2);
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chrcmd[ind] = (chrcmd[ind] & (0xF0 >> sar)) | ((V & 0x0F) << sar);
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} else
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switch (A & 0xF003) {
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case 0x8000: prg0 = V; break;
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case 0xA000: prg1 = V; break;
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case 0x9000: mirr = V & 1; break;
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}
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Sync();
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}
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}
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static void StateRestore(int version) {
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if (bbrk & 2) {
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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} else
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Sync();
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}
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static void UNLSL1632Power(void) {
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GenMMC3Power();
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SetWriteHandler(0x4100, 0xFFFF, UNLSL1632CMDWrite);
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}
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void UNLSL1632_Init(CartInfo *info) {
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GenMMC3_Init(info, 256, 512, 0, 0);
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cwrap = UNLSL1632CW;
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info->Power = UNLSL1632Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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