mirror of
https://github.com/dborth/fceugx.git
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86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2005 CaH4e3
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* GG1 boards, similar to T-262, with no Data latch
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*
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*/
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#include "mapinc.h"
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static uint16 cmdreg;
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static uint8 reset;
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static SFORMAT StateRegs[] =
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{
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{ &reset, 1, "REST" },
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{ &cmdreg, 2, "CREG" },
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{ 0 }
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};
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static void Sync(void) {
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uint32 base = ((cmdreg & 0x060) | ((cmdreg & 0x100) >> 1)) >> 2;
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uint32 bank = (cmdreg & 0x01C) >> 2;
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uint32 lbank = (cmdreg & 0x200) ? 7 : ((cmdreg & 0x80) ? bank : 0);
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if (PRGptr[1]) {
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setprg16r(base >> 3, 0x8000, bank); // for versions with split ROMs
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setprg16r(base >> 3, 0xC000, lbank);
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} else {
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setprg16(0x8000, base | bank);
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setprg16(0xC000, base | lbank);
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}
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setmirror(((cmdreg & 2) >> 1) ^ 1);
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}
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static DECLFR(UNL8157Read) {
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if ((cmdreg & 0x100) && (PRGsize[0] < (1024 * 1024))) {
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A = (A & 0xFFF0) + reset;
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}
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return CartBR(A);
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}
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static DECLFW(UNL8157Write) {
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cmdreg = A;
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Sync();
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}
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static void UNL8157Power(void) {
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setchr8(0);
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SetWriteHandler(0x8000, 0xFFFF, UNL8157Write);
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SetReadHandler(0x8000, 0xFFFF, UNL8157Read);
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cmdreg = reset = 0;
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Sync();
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}
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static void UNL8157Reset(void) {
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cmdreg = reset = 0;
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reset++;
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reset &= 0x1F;
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Sync();
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}
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static void UNL8157Restore(int version) {
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Sync();
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}
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void UNL8157_Init(CartInfo *info) {
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info->Power = UNL8157Power;
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info->Reset = UNL8157Reset;
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GameStateRestore = UNL8157Restore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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