mirror of
https://github.com/dborth/fceugx.git
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101 lines
2.5 KiB
C++
101 lines
2.5 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) 2008 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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// T-227-1, 820632, MMC3 based, multimenu, 60000in1 (0010) dip switches
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#include "mapinc.h"
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#include "mmc3.h"
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static uint8 reset_flag = 0x07;
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static void BMCT2271CW(uint32 A, uint8 V) {
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uint32 va = V;
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if (EXPREGS[0] & 0x20) {
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va |= 0x200;
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va |= (EXPREGS[0] & 0x10) << 4;
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} else {
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va &= 0x7F;
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va |= (EXPREGS[0] & 0x18) << 4;
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}
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setchr1(A, va);
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}
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static void BMCT2271PW(uint32 A, uint8 V) {
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uint32 va = V & 0x3F;
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if (EXPREGS[0] & 0x20) {
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va &= 0x1F;
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va |= 0x40;
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va |= (EXPREGS[0] & 0x10) << 1;
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} else {
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va &= 0x0F;
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va |= (EXPREGS[0] & 0x18) << 1;
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}
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switch (EXPREGS[0] & 3) {
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case 0x00: setprg8(A, va); break;
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case 0x02:
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{
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va = (va & 0xFD) | ((EXPREGS[0] & 4) >> 1);
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if (A < 0xC000) {
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setprg16(0x8000, va >> 1);
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setprg16(0xC000, va >> 1);
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}
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break;
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}
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case 0x01:
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case 0x03: if (A < 0xC000) setprg32(0x8000, va >> 2); break;
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}
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}
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static DECLFW(BMCT2271LoWrite) {
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if (!(EXPREGS[0] & 0x80))
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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 DECLFR(BMCT2271HiRead) {
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uint32 av = A;
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if (EXPREGS[0] & 0x40) av = (av & 0xFFF0) | reset_flag;
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return CartBR(av);
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}
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static void BMCT2271Reset(void) {
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EXPREGS[0] = 0x00;
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reset_flag++;
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reset_flag &= 0x0F;
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MMC3RegReset();
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}
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static void BMCT2271Power(void) {
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EXPREGS[0] = 0x00;
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GenMMC3Power();
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SetWriteHandler(0x6000, 0x7FFF, BMCT2271LoWrite);
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SetReadHandler(0x8000, 0xFFFF, BMCT2271HiRead);
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}
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void BMCT2271_Init(CartInfo *info) {
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GenMMC3_Init(info, 128, 128, 8, 0);
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pwrap = BMCT2271PW;
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cwrap = BMCT2271CW;
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info->Power = BMCT2271Power;
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info->Reset = BMCT2271Reset;
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AddExState(EXPREGS, 1, 0, "EXPR");
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}
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