mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 15:05:05 +01:00
86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
/* FCE Ultra - NES/Famicom Emulator
|
|
*
|
|
* Copyright notice for this file:
|
|
* Copyright (C) 2012 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 cregs[4], pregs[2];
|
|
static uint8 IRQCount, IRQa;
|
|
|
|
static SFORMAT StateRegs[] =
|
|
{
|
|
{ cregs, 4, "CREG" },
|
|
{ pregs, 2, "PREG" },
|
|
{ &IRQa, 1, "IRQA" },
|
|
{ &IRQCount, 1, "IRQC" },
|
|
{ 0 }
|
|
};
|
|
|
|
static void Sync(void) {
|
|
setprg8(0x8000, pregs[0]);
|
|
setprg8(0xa000, pregs[1]);
|
|
setprg8(0xc000, ~1);
|
|
setprg8(0xe000, ~0);
|
|
setchr2(0x0000, cregs[0]);
|
|
setchr2(0x0800, cregs[1]);
|
|
setchr2(0x1000, cregs[2]);
|
|
setchr2(0x1800, cregs[3]);
|
|
}
|
|
|
|
static DECLFW(M91Write0) {
|
|
cregs[A & 3] = V;
|
|
Sync();
|
|
}
|
|
|
|
static DECLFW(M91Write1) {
|
|
switch (A & 3) {
|
|
case 0:
|
|
case 1: pregs[A & 1] = V; Sync(); break;
|
|
case 2: IRQa = IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;
|
|
case 3: IRQa = 1; X6502_IRQEnd(FCEU_IQEXT); break;
|
|
}
|
|
}
|
|
|
|
static void M91Power(void) {
|
|
Sync();
|
|
SetWriteHandler(0x6000, 0x6fff, M91Write0);
|
|
SetWriteHandler(0x7000, 0x7fff, M91Write1);
|
|
SetReadHandler(0x8000, 0xffff, CartBR);
|
|
}
|
|
|
|
static void M91IRQHook(void) {
|
|
if (IRQCount < 8 && IRQa) {
|
|
IRQCount++;
|
|
if (IRQCount >= 8) {
|
|
X6502_IRQBegin(FCEU_IQEXT);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void StateRestore(int version) {
|
|
Sync();
|
|
}
|
|
|
|
void Mapper91_Init(CartInfo *info) {
|
|
info->Power = M91Power;
|
|
GameHBIRQHook = M91IRQHook;
|
|
GameStateRestore = StateRestore;
|
|
AddExState(&StateRegs, ~0, 0, 0);
|
|
}
|