113 lines
2.6 KiB
C
113 lines
2.6 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) 2022 negativeExponent
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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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*
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*/
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#include "mapinc.h"
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#include "mmc3.h"
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static uint8 *CHRRAM;
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static uint32 CHRRAMSIZE;
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static int getPRGBank(int bank) {
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if ((~bank & 1) && (MMC3_cmd & 0x40)) bank ^= 2;
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return (bank & 2) ? 0xFE | (bank & 1) : DRegBuf[6 | (bank & 1)];
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}
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static void M393CW(uint32 A, uint8 V) {
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if (EXPREGS[0] & 8)
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setchr8r(0x10, 0);
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else
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setchr1(A, V & 0xFF | EXPREGS[0] << 8);
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}
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static void M393PW(uint32 A, uint8 V) {
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switch ((EXPREGS[0] >> 4) & 3) {
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case 0:
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case 1:
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setprg8(A, (V & 0x0F) | (EXPREGS[0] << 4));
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break;
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case 2:
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setprg32(0x8000, ((getPRGBank(0) >> 2) & 3) | (EXPREGS[0] << 2));
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break;
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case 3:
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setprg16(0x8000, (EXPREGS[0] << 3) | (EXPREGS[1] &7));
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setprg16(0xC000, (EXPREGS[0] << 3) | 7);
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break;
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}
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}
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static DECLFW(M393Write8) {
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switch (A & 0xE000) {
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case 0x8000:
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case 0xA000:
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MMC3_CMDWrite(A, V);
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break;
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case 0xC000:
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case 0xE000:
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MMC3_IRQWrite(A, V);
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break;
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}
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EXPREGS[1] = V;
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FixMMC3CHR(MMC3_cmd);
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FixMMC3PRG(MMC3_cmd);
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}
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static DECLFW(M393Write6) {
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EXPREGS[0] = A & 0xFF;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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static void M393Power(void) {
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EXPREGS[0] = EXPREGS[1] = 0;
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GenMMC3Power();
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SetWriteHandler(0x6000, 0x7FFF, M393Write6);
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SetWriteHandler(0x8000, 0xFFFF, M393Write8);
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}
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static void M393Reset(void) {
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EXPREGS[0] = EXPREGS[1] = 0;
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MMC3RegReset();
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}
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static void M393lose(void) {
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GenMMC3Close();
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if (CHRRAM)
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FCEU_free(CHRRAM);
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CHRRAM = NULL;
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}
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void Mapper393_Init(CartInfo *info) {
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GenMMC3_Init(info, 1024, 512, 8, 0);
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pwrap = M393PW;
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cwrap = M393CW;
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info->Power = M393Power;
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info->Reset = M393Reset;
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info->Close = M393lose;
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CHRRAMSIZE = 8192;
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CHRRAM = (uint8 *)FCEU_gmalloc(CHRRAMSIZE);
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SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSIZE, 1);
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AddExState(CHRRAM, CHRRAMSIZE, 0, "CHRR");
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AddExState(EXPREGS, 1, 0, "EXPR");
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}
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