97 lines
2.6 KiB
C
97 lines
2.6 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 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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* NES 2.0 - Mapper 401 (reference from NewRisingSun)
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* Super 19-in-1 (VIP19) (crc 0x2F497313)
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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 dipswitch = 0;
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static void M401CW(uint32 A, uint8 V) {
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uint32 mask = (0xFF >> (~EXPREGS[2] & 0xF));
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uint32 bank = (EXPREGS[0] | ((EXPREGS[2] << 4) & 0xF00));
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setchr1(A, (V & mask) | bank);
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}
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static void M401PW(uint32 A, uint8 V) {
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if ((dipswitch & 1) && (EXPREGS[1] & 0x80)) {
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/* openbus */
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} else {
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uint32 mask = (~EXPREGS[3] & 0x1F);
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uint32 bank = (EXPREGS[1] & 0x1F) | (EXPREGS[2] & 0x80) |
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((dipswitch & 2) ? (EXPREGS[2] & 0x20) : ((EXPREGS[1] >> 1) & 0x20)) |
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((dipswitch & 4) ? (EXPREGS[2] & 0x40) : ((EXPREGS[1] << 1) & 0x40));
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setprg8(A, (V & mask) | bank);
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}
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}
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static DECLFR(M401Read) {
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if ((dipswitch & 1) && (EXPREGS[1] & 0x80))
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return X.DB;
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return CartBR(A);
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}
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static DECLFW(M401Write) {
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/* FCEU_printf("Wr A:%04x V:%02x index:%d\n", A, V, EXPREGS[4]); */
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if (!(EXPREGS[3] & 0x40)) {
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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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CartBW(A, V);
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}
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static void M401Reset(void) {
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dipswitch = (dipswitch + 1) & 7;
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FCEU_printf("dipswitch = %d\n", dipswitch);
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EXPREGS[0] = 0x00;
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EXPREGS[1] = 0x00;
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EXPREGS[2] = 0x0F;
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EXPREGS[3] = 0x00;
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EXPREGS[4] = 0x00;
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MMC3RegReset();
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}
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static void M401Power(void) {
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dipswitch = 7;
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EXPREGS[0] = 0x00;
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EXPREGS[1] = 0x00;
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EXPREGS[2] = 0x0F;
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EXPREGS[3] = 0x00;
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EXPREGS[4] = 0x00;
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GenMMC3Power();
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SetReadHandler(0x8000, 0xFFFF, M401Read);
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SetWriteHandler(0x6000, 0x7FFF, M401Write);
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}
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void Mapper401_Init(CartInfo *info) {
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GenMMC3_Init(info, 256, 256, 8, 0);
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cwrap = M401CW;
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pwrap = M401PW;
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info->Power = M401Power;
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info->Reset = M401Reset;
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AddExState(EXPREGS, 5, 0, "EXPR");
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AddExState(&dipswitch, 1, 0, "DPSW");
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}
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