93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
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/* 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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*
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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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// mapper 111 - Cheapocabra board by Memblers
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// http://forums.nesdev.com/viewtopic.php?p=146039
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//
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// 512k PRG-ROM in 32k pages
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// 32k CHR-ROM used as:
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// 2 x 8k pattern pages
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// 2 x 8k nametable pages
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//
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// Notes:
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// - PRG-ROM is actually flash RAM. Self-flashing should be implemented if battery backed.
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// - CHR-RAM for nametables maps to $3000-3FFF as well, but FCEUX internally limits to 4k?
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#include "mapinc.h"
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static uint8 reg;
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static uint8 *CHRRAM = NULL;
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static uint32 CHRRAMSIZE;
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static SFORMAT StateRegs[] =
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{
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{ ®, 1, "REG" },
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{ 0 }
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};
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static void Sync(void) {
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// bit 7 controls green LED
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// bit 6 controls red LED
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int nt = (reg & 0x20) ? 8192 : 0; // bit 5 controls 8k nametable page
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int chr = (reg & 0x10) ? 1 : 0; // bit 4 selects 8k CHR page
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int prg = (reg & 0x0F); // bits 0-3 select 32k PRG page
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nt += (16 * 1024);
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for (int n=0; n<4; ++n)
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{
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setntamem(CHRRAM + nt + (1024 * n),1,n);
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}
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setchr8r(0x10, chr);
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setprg32(0x8000,prg);
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}
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static DECLFW(M111Write) {
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if ((A >= 0x5000 && A <= 0x5FFF) || (A >= 0x7000 && A <= 0x7FFF))
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{
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reg = V;
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Sync();
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}
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}
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static void M111Power(void) {
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reg = 0xFF;
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Sync();
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SetReadHandler(0x8000, 0xffff, CartBR);
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SetWriteHandler(0x5000, 0x5fff, M111Write);
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SetWriteHandler(0x7000, 0x7fff, M111Write);
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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 Mapper111_Init(CartInfo *info) {
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info->Power = M111Power;
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CHRRAMSIZE = 1024 * 32;
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CHRRAM = (uint8*)FCEU_gmalloc(CHRRAMSIZE);
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SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSIZE, 1);
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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AddExState(CHRRAM, CHRRAMSIZE, 0, "CRAM");
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}
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