112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2020
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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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/* added 2020-1-28 - */
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/* NES 2.0 Mapper 372 is used for a revision of the Rockman I-VI multicart (PCB ID SFC-12).
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* It is INES Mapper 045 but with one bit of outer bank register #2 working as a CHR-ROM/RAM switch.
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*/
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#include "mapinc.h"
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#include "mmc3.h"
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static uint8 WRAM[0x2000];
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static uint32 CHRRAMSIZE;
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static uint8 *CHRRAM;
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static void M372CW(uint32 A, uint8 V) {
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if (!UNIFchrrama) {
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uint32 NV = V;
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if (EXPREGS[2] & 8)
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NV &= (1 << ((EXPREGS[2] & 7) + 1)) - 1;
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else if (EXPREGS[2])
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NV &= 0; /* hack ;( don't know exactly how it should be */
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NV |= EXPREGS[0] | ((EXPREGS[2] & 0xF0) << 4);
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if (EXPREGS[2] & 0x20)
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setchr1r(0x10, A, V);
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else
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setchr1(A, NV);
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} else
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/* setchr8(0); */ /* i don't know what cart need this, but a new one need other lol */
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setchr1(A, V);
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}
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static void M372PW(uint32 A, uint8 V) {
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uint32 MV = V & ((EXPREGS[3] & 0x3F) ^ 0x3F);
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MV |= EXPREGS[1];
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if(UNIFchrrama)
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MV |= ((EXPREGS[2] & 0x40) << 2);
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setprg8(A, MV);
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/* FCEU_printf("1:%02x 2:%02x 3:%02x A=%04x V=%03x\n",EXPREGS[1],EXPREGS[2],EXPREGS[3],A,MV); */
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}
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static DECLFW(M372Write) {
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if (EXPREGS[3] & 0x40) {
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WRAM[A - 0x6000] = V;
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return;
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}
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EXPREGS[EXPREGS[4]] = V;
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EXPREGS[4] = (EXPREGS[4] + 1) & 3;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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static DECLFR(M372Read) {
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uint32 addr = 1 << (EXPREGS[5] + 4);
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if (A & (addr | (addr - 1)))
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return X.DB | 1;
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else
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return X.DB;
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}
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static void M372Reset(void) {
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EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = EXPREGS[4] = 0;
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EXPREGS[5]++;
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EXPREGS[5] &= 7;
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MMC3RegReset();
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}
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static void M372Power(void) {
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GenMMC3Power();
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EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = EXPREGS[4] = EXPREGS[5] = 0;
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SetWriteHandler(0x5000, 0x7FFF, M372Write);
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SetReadHandler(0x5000, 0x5FFF, M372Read);
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}
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static void M372Close(void) {
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GenMMC3Close();
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if (CHRRAM)
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FCEU_gfree(CHRRAM);
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CHRRAM = NULL;
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}
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void Mapper372_Init(CartInfo *info) {
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GenMMC3_Init(info, 512, 256, 8, info->battery);
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cwrap = M372CW;
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pwrap = M372PW;
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info->Reset = M372Reset;
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info->Power = M372Power;
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info->Close = M372Close;
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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, 5, 0, "EXPR");
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}
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