fceux/src/boards/88.cpp

84 lines
2.1 KiB
C++

/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2005 CaH4e3
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "mapinc.h"
static uint8 reg[8];
static uint8 mirror, cmd, is154;
static SFORMAT StateRegs[] =
{
{ &cmd, 1, "CMD" },
{ &mirror, 1, "MIRR" },
{ reg, 8, "REGS" },
{ 0 }
};
static void Sync(void) {
setchr2(0x0000, reg[0] >> 1);
setchr2(0x0800, reg[1] >> 1);
setchr1(0x1000, reg[2] | 0x40);
setchr1(0x1400, reg[3] | 0x40);
setchr1(0x1800, reg[4] | 0x40);
setchr1(0x1C00, reg[5] | 0x40);
setprg8(0x8000, reg[6]);
setprg8(0xA000, reg[7]);
setprg8(0xC000, ~1);
setprg8(0xE000, ~0);
}
static void MSync(void) {
if (is154) setmirror(MI_0 + (mirror & 1));
}
static DECLFW(M88Write) {
switch (A & 0x8001) {
case 0x8000: cmd = V & 7; mirror = V >> 6; MSync(); break;
case 0x8001: reg[cmd] = V; Sync(); break;
}
}
static void M88Power(void) {
reg[0] = reg[1] = reg[2] = reg[3] = reg[4] = reg[5] = reg[6] = reg[7] = 0;
Sync();
MSync();
SetReadHandler(0x8000, 0xFFFF, CartBR);
SetWriteHandler(0x8000, 0xFFFF, M88Write);
}
static void StateRestore(int version) {
Sync();
MSync();
}
void Mapper88_Init(CartInfo *info) {
is154 = 0;
info->Power = M88Power;
GameStateRestore = StateRestore;
AddExState(&StateRegs, ~0, 0, 0);
}
void Mapper154_Init(CartInfo *info) {
is154 = 1;
info->Power = M88Power;
GameStateRestore = StateRestore;
AddExState(&StateRegs, ~0, 0, 0);
}