2025-09-11 00:03:29 +02:00
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2025 NewRisingSun
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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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#include "mapinc.h"
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#include "asic_n118.h"
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static void (*N118_cbSync)();
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static int (*N118_cbGetPRGBank)(uint8);
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static int (*N118_cbGetCHRBank)(uint8);
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static uint8 N118_index;
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static uint8 N118_reg[8];
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static SFORMAT N118_state[] = {
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{ N118_reg, 8, "N8RG" },
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{&N118_index, 1, "N8IX" },
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{ 0 }
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};
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int N118_getPRGBank (uint8 bank) {
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return bank &2? (0xFE | bank &1): N118_reg[6 | bank &1];
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}
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int N118_getCHRBank (uint8 bank) {
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return bank &4? N118_reg[bank -2]: (N118_reg[bank >>1] &~1 | bank &1);
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}
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void N118_syncPRG (int AND, int OR) {
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int bank;
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for (bank = 0; bank < 4; bank++) setprg8(0x8000 | bank <<13, N118_cbGetPRGBank(bank) &AND |OR);
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}
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void N118_syncCHR (int AND, int OR) {
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int bank;
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for (bank = 0; bank < 8; bank++) setchr1(bank <<10, N118_cbGetCHRBank(bank) &AND |OR);
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}
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2025-09-12 21:59:27 +02:00
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DECLFW (N118_writeReg) {
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2025-09-11 00:03:29 +02:00
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if (A &1) {
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N118_reg[N118_index &7] = V;
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N118_cbSync();
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} else
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N118_index = V;
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}
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void N118_clear () {
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N118_reg[0] = 0; N118_reg[1] = 2; N118_reg[2] = 4; N118_reg[3] = 5; N118_reg[4] = 6; N118_reg[5] = 7; N118_reg[6] = 0; N118_reg[7] = 1;
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N118_index = 0;
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N118_cbSync();
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}
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static void N118_setHandlers () {
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SetReadHandler (0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetWriteHandler(0x8000, 0x9FFF, N118_writeReg);
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}
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static void N118_configure (void (*sync)(), int (*prg)(uint8), int (*chr)(uint8)) {
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N118_cbSync = sync;
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N118_cbGetPRGBank = prg? prg: N118_getPRGBank;
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N118_cbGetCHRBank = chr? chr: N118_getCHRBank;
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}
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void N118_activate (uint8 clear, void (*sync)(), int (*prg)(uint8), int (*chr)(uint8)) {
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N118_configure(sync, prg, chr);
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N118_setHandlers();
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if (clear)
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N118_clear();
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else
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N118_cbSync();
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}
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void N118_addExState () {
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AddExState(N118_state, ~0, 0, 0);
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}
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void N118_restore (int version) {
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N118_cbSync();
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}
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void N118_power () {
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N118_setHandlers();
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N118_clear();
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}
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void N118_init (CartInfo *info, void (*sync)(), int (*prg)(uint8), int (*chr)(uint8)) {
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N118_addExState();
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N118_configure(sync, prg, chr);
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info->Power = N118_power;
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info->Reset = N118_cbSync;
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GameStateRestore = N118_restore;
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}
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