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89 lines
2.3 KiB
C++
89 lines
2.3 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 Cluster
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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 470 denotes the INX_007T_V01 multicart circuit board,
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* used for the Retro-Bit re-release of Battletoads and Double Dragon.
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* It is basically AOROM with an additional outer bank register at $5000-$5FFF
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* whose data selects the 256 KiB outer bank.
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*
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* $5000-$5FFF
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* 7 bit 0
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* ---- ----
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* xxxx xxOO
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* ||
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* ++- Select outer 256 KB PRG ROM bank for CPU $8000-$FFFF
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*
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* $8000-$FFFF
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* 7 bit 0
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* ---- ----
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* xxxM xPPP
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* | |||
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* | +++- Select inner 32 KB PRG ROM bank for CPU $8000-$FFFF
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* +------ Select 1 KB VRAM page for all 4 nametables
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*
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*/
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#include "mapinc.h"
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static uint8 latch_out, latch_in;
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static void INX_007T_Sync() {
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setprg32(0x8000, (latch_in & 0b111) | (latch_out << 3));
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setmirror(MI_0 + ((latch_in >> 4) & 1));
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setchr8(0);
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}
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static void StateRestore(int version) {
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INX_007T_Sync();
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}
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static DECLFW(INX_007T_WriteLow)
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{
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latch_out = V;
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INX_007T_Sync();
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}
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static DECLFW(INX_007T_WriteHi)
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{
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latch_in = V;
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INX_007T_Sync();
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}
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static void INX_007T_Power(void) {
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latch_in = latch_out = 0;
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INX_007T_Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x5000,0x5FFF, INX_007T_WriteLow);
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SetWriteHandler(0x8000, 0xFFFF, INX_007T_WriteHi);
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}
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static void INX_007T_Reset(void) {
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latch_in = latch_out = 0;
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INX_007T_Sync();
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}
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void INX_007T_Init(CartInfo *info) {
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info->Power = INX_007T_Power;
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info->Reset = INX_007T_Reset;
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GameStateRestore = StateRestore;
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SetupCartMirroring(MI_0, 0, NULL);
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AddExState(&latch_out, 1, 0, "LATO");
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AddExState(&latch_in, 1, 0, "LATI");
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}
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