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Initial commit - http://sourceforge.net/p/fceumm/code/160/

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twinaphex
2014-03-30 22:15:17 +02:00
commit 7e6caac57d
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src/boards/117.c Normal file
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/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2002 Xodnizel
*
* 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 prgreg[4], chrreg[8], mirror;
static uint8 IRQa, IRQCount, IRQLatch;
static SFORMAT StateRegs[] =
{
{ &IRQa, 1, "IRQA" },
{ &IRQCount, 1, "IRQC" },
{ &IRQLatch, 1, "IRQL" },
{ prgreg, 4, "PREG" },
{ chrreg, 8, "CREG" },
{ &mirror, 1, "MREG" },
{ 0 }
};
static void Sync(void) {
setprg8(0x8000, prgreg[0]);
setprg8(0xa000, prgreg[1]);
setprg8(0xc000, prgreg[2]);
setprg8(0xe000, prgreg[3]);
int i;
for (i = 0; i < 8; i++)
setchr1(i << 10, chrreg[i]);
setmirror(mirror ^ 1);
}
static DECLFW(M117Write) {
if (A < 0x8004) {
prgreg[A & 3] = V;
Sync();
} else if ((A >= 0xA000) && (A <= 0xA007)) {
chrreg[A & 7] = V;
Sync();
} else switch (A) {
case 0xc001: IRQLatch = V; break;
case 0xc003: IRQCount = IRQLatch; IRQa |= 2; break;
case 0xe000: IRQa &= ~1; IRQa |= V & 1; X6502_IRQEnd(FCEU_IQEXT); break;
case 0xc002: X6502_IRQEnd(FCEU_IQEXT); break;
case 0xd000: mirror = V & 1;
}
}
static void M117Power(void) {
prgreg[0] = ~3; prgreg[1] = ~2; prgreg[2] = ~1; prgreg[3] = ~0;
Sync();
SetReadHandler(0x8000, 0xFFFF, CartBR);
SetWriteHandler(0x8000, 0xFFFF, M117Write);
}
static void M117IRQHook(void) {
if (IRQa == 3 && IRQCount) {
IRQCount--;
if (!IRQCount) {
IRQa &= 1;
X6502_IRQBegin(FCEU_IQEXT);
}
}
}
static void StateRestore(int version) {
Sync();
}
void Mapper117_Init(CartInfo *info) {
info->Power = M117Power;
GameHBIRQHook = M117IRQHook;
GameStateRestore = StateRestore;
AddExState(&StateRegs, ~0, 0, 0);
}