mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-01 15:05:05 +01:00
86 lines
2.0 KiB
C++
86 lines
2.0 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
|
||
|
|
*
|
||
|
|
* FDS Conversion
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "mapinc.h"
|
||
|
|
|
||
|
|
static uint8 reg;
|
||
|
|
static uint32 IRQCount, IRQa;
|
||
|
|
|
||
|
|
static SFORMAT StateRegs[] =
|
||
|
|
{
|
||
|
|
{ &IRQCount, 4, "IRQC" },
|
||
|
|
{ &IRQa, 4, "IRQA" },
|
||
|
|
{ ®, 1, "REG" },
|
||
|
|
{ 0 }
|
||
|
|
};
|
||
|
|
|
||
|
|
static void Sync(void) {
|
||
|
|
setprg8(0x6000, ~1);
|
||
|
|
setprg8(0x8000, ~3);
|
||
|
|
setprg8(0xa000, ~2);
|
||
|
|
setprg8(0xc000, reg);
|
||
|
|
setprg8(0xe000, ~0);
|
||
|
|
setchr8(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static DECLFW(M40Write) {
|
||
|
|
switch (A & 0xe000) {
|
||
|
|
case 0x8000: IRQa = 0; IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;
|
||
|
|
case 0xa000: IRQa = 1; break;
|
||
|
|
case 0xe000: reg = V & 7; Sync(); break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void M40Power(void) {
|
||
|
|
reg = 0;
|
||
|
|
Sync();
|
||
|
|
SetReadHandler(0x6000, 0xffff, CartBR);
|
||
|
|
SetWriteHandler(0x8000, 0xffff, M40Write);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void M40Reset(void) {
|
||
|
|
}
|
||
|
|
|
||
|
|
static void M40IRQHook(int a) {
|
||
|
|
if (IRQa) {
|
||
|
|
if (IRQCount < 4096)
|
||
|
|
IRQCount += a;
|
||
|
|
else{
|
||
|
|
IRQa = 0;
|
||
|
|
X6502_IRQBegin(FCEU_IQEXT);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void StateRestore(int version) {
|
||
|
|
Sync();
|
||
|
|
}
|
||
|
|
|
||
|
|
void Mapper40_Init(CartInfo *info) {
|
||
|
|
info->Reset = M40Reset;
|
||
|
|
info->Power = M40Power;
|
||
|
|
MapIRQHook = M40IRQHook;
|
||
|
|
GameStateRestore = StateRestore;
|
||
|
|
AddExState(&StateRegs, ~0, 0, 0);
|
||
|
|
}
|