mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 06:55:05 +01:00
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/* FCE Ultra - NES/Famicom Emulator
|
|
*
|
|
* Copyright notice for this file:
|
|
* Copyright (C) 2009 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
|
|
*
|
|
* 7-in-1 Darkwing Duck, Snake, MagicBlock (PCB marked as "12 in 1")
|
|
* 12-in-1 1991 New Star Co. Ltd.
|
|
*
|
|
*/
|
|
|
|
#include "mapinc.h"
|
|
|
|
static uint8 prgchr[2], ctrl;
|
|
static SFORMAT StateRegs[] =
|
|
{
|
|
{ prgchr, 2, "REGS" },
|
|
{ &ctrl, 1, "CTRL" },
|
|
{ 0 }
|
|
};
|
|
|
|
static void Sync(void) {
|
|
uint8 bank = (ctrl & 3) << 3;
|
|
setchr4(0x0000, (prgchr[0] >> 3) | (bank << 2));
|
|
setchr4(0x1000, (prgchr[1] >> 3) | (bank << 2));
|
|
if (ctrl & 8) {
|
|
setprg16(0x8000, bank | (prgchr[0] & 6) | 0); // actually, both 0 and 1 registers used, but they will switch each PA12 transition
|
|
setprg16(0xc000, bank | (prgchr[0] & 6) | 1); // if bits are different for both registers, so they must be programmed strongly the same!
|
|
} else {
|
|
setprg16(0x8000, bank | (prgchr[0] & 7));
|
|
setprg16(0xc000, bank | 7 );
|
|
}
|
|
setmirror(((ctrl & 4) >> 2) ^ 1);
|
|
}
|
|
|
|
static DECLFW(BMC12IN1Write) {
|
|
switch (A & 0xE000) {
|
|
case 0xA000: prgchr[0] = V; Sync(); break;
|
|
case 0xC000: prgchr[1] = V; Sync(); break;
|
|
case 0xE000: ctrl = V & 0x0F; Sync(); break;
|
|
}
|
|
}
|
|
|
|
static void BMC12IN1Power(void) {
|
|
prgchr[0] = prgchr[1] = ctrl = 0;
|
|
Sync();
|
|
SetReadHandler(0x8000, 0xFFFF, CartBR);
|
|
SetWriteHandler(0x8000, 0xFFFF, BMC12IN1Write);
|
|
}
|
|
|
|
static void StateRestore(int version) {
|
|
Sync();
|
|
}
|
|
|
|
void BMC12IN1_Init(CartInfo *info) {
|
|
info->Power = BMC12IN1Power;
|
|
GameStateRestore = StateRestore;
|
|
AddExState(&StateRegs, ~0, 0, 0);
|
|
}
|
|
|