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https://github.com/dborth/fceugx.git
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86 lines
2.2 KiB
C++
86 lines
2.2 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) 2016 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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* FDS Conversion (Exciting Basket), weird banking addressing, seems because
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* of used addressing scheme, made to disable the lower system banks from 6000
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* but the kaiser mapper chip and PCB are the same as usual
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* probably need a hard eprom dump to verify actual banks layout
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*
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*/
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#include "mapinc.h"
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static uint8 preg;
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static SFORMAT StateRegs[] =
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{
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{ &preg, 1, "PREG" },
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{ 0 }
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};
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static void Sync(void) {
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setprg8(0x6000, preg);
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setprg8(0x8000, 0xC);
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setprg8(0xA000, 0xD);
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setprg8(0xC000, 0xE);
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setprg8(0xE000, 0xF);
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setchr8(0);
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}
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static DECLFW(UNLKS7016Write) {
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u16 mask = (A & 0x30);
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switch(A & 0xD943) {
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case 0xD943: {
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if(mask == 0x30) {
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preg = 8 | 3; // or A, or no bus (all FF)
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} else {
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preg = (A >> 2) & 0xF; // can be anything but C-F
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}
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Sync();
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break;
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}
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case 0xD903: { // this case isn't usedby the game, but addressing does this as a side effect
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if(mask == 0x30) {
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preg = 8 | ((A >> 2) & 3); // also masked C-F from output
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} else {
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preg = 8 | 3;
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}
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Sync();
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break;
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}
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}
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}
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static void UNLKS7016Power(void) {
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preg = 8;
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Sync();
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SetReadHandler(0x6000, 0xffff, CartBR);
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SetWriteHandler(0x8000, 0xffff, UNLKS7016Write);
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}
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static void StateRestore(int version) {
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Sync();
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}
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void UNLKS7016_Init(CartInfo *info) {
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info->Power = UNLKS7016Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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