fceugx/source/fceultra/boards/65.cpp
2012-12-14 17:43:51 +00:00

105 lines
2.8 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 preg[3], creg[8], mirr;
static uint8 IRQa;
static int16 IRQCount, IRQLatch;
static SFORMAT StateRegs[] =
{
{ preg, 3, "PREG" },
{ creg, 8, "CREG" },
{ &mirr, 1, "MIRR" },
{ &IRQa, 1, "IRQA" },
{ &IRQCount, 2, "IRQC" },
{ &IRQLatch, 2, "IRQL" },
{ 0 }
};
static void Sync(void) {
setmirror(mirr);
setprg8(0x8000, preg[0]);
setprg8(0xA000, preg[1]);
setprg8(0xC000, preg[2]);
setprg8(0xE000, ~0);
setchr1(0x0000, creg[0]);
setchr1(0x0400, creg[1]);
setchr1(0x0800, creg[2]);
setchr1(0x0C00, creg[3]);
setchr1(0x1000, creg[4]);
setchr1(0x1400, creg[5]);
setchr1(0x1800, creg[6]);
setchr1(0x1C00, creg[7]);
setmirror(mirr);
}
static DECLFW(M65Write) {
switch (A) {
case 0x8000: preg[0] = V; Sync(); break;
case 0xA000: preg[1] = V; Sync(); break;
case 0xC000: preg[2] = V; Sync(); break;
case 0x9001: mirr = ((V >> 7) & 1) ^ 1; Sync(); break;
case 0x9003: IRQa = V & 0x80; X6502_IRQEnd(FCEU_IQEXT); break;
case 0x9004: IRQCount = IRQLatch; break;
case 0x9005: IRQLatch &= 0x00FF; IRQLatch |= V << 8; break;
case 0x9006: IRQLatch &= 0xFF00; IRQLatch |= V; break;
case 0xB000: creg[0] = V; Sync(); break;
case 0xB001: creg[1] = V; Sync(); break;
case 0xB002: creg[2] = V; Sync(); break;
case 0xB003: creg[3] = V; Sync(); break;
case 0xB004: creg[4] = V; Sync(); break;
case 0xB005: creg[5] = V; Sync(); break;
case 0xB006: creg[6] = V; Sync(); break;
case 0xB007: creg[7] = V; Sync(); break;
}
}
static void M65Power(void) {
preg[2] = ~1;
Sync();
SetReadHandler(0x8000, 0xFFFF, CartBR);
SetWriteHandler(0x8000, 0xFFFF, M65Write);
}
void M65IRQ(int a) {
if (IRQa) {
IRQCount -= a;
if (IRQCount < -4) {
X6502_IRQBegin(FCEU_IQEXT);
IRQa = 0;
IRQCount = -1;
}
}
}
static void StateRestore(int version) {
Sync();
}
void Mapper65_Init(CartInfo *info) {
info->Power = M65Power;
MapIRQHook = M65IRQ;
GameStateRestore = StateRestore;
AddExState(&StateRegs, ~0, 0, 0);
}