79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
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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_latch.h"
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static uint8 pad;
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static void sync_submapper0 () {
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if (Latch_data &0x40)
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setprg32(0x8000, Latch_data >>1);
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else {
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setprg16(0x8000, Latch_data);
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setprg16(0xC000, Latch_data |7);
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}
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setchr8(0);
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if (Latch_data &0x80)
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setmirror(Latch_data &0x20? MI_1: MI_0);
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else
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setmirror(Latch_data &0x20? MI_H: MI_V);
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}
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static void sync_submapper1 () {
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if (Latch_data &0x40)
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setprg32(0x8000, Latch_data >>1 &0x03 | Latch_data >>2 &~0x03);
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else {
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setprg16(0x8000, Latch_data >>1 &~0x07 | Latch_data &0x07);
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setprg16(0xC000, Latch_data >>1 | 0x07);
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}
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setchr8(0);
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if (Latch_data &0x80)
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setmirror(Latch_data &0x20? MI_1: MI_0);
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else
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setmirror(Latch_data &0x08? MI_H: MI_V);
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}
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static DECLFR (readPad) {
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if (A &0x80) return pad >= 20? (4 | pad % 20): 0; else
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if (A &0x40) return pad >= 16? (4 | pad % 16): 0; else
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if (A &0x20) return pad >= 12? (4 | pad % 12): 0; else
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if (A &0x10) return pad >= 8? (4 | pad % 8): 0; else
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return pad >= 8? 0: pad &7;
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}
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static void power() {
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pad = 0;
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Latch_power();
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SetReadHandler(0x5000, 0x5FFF, readPad);
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}
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static void reset() {
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pad = ++pad %24;
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Latch_clear();
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}
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void Mapper285_Init (CartInfo *info) {
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Latch_init(info, info->submapper ==1? sync_submapper1: sync_submapper0, 0x8000, 0xFFFF, NULL);
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info->Power = power;
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info->Reset = reset;
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AddExState(&pad, 1, 0, "DIPS");
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}
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