Add mapper 393

2022-02-10 20:50:21 +08:00
parent c6734c95d0
commit 69c1a07fc4
3 changed files with 116 additions and 0 deletions
--- a/src/boards/393.c
+++ b/src/boards/393.c
@@ -0,0 +1,112 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2022 negativeExponent
+ *
+ * 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"
+#include "mmc3.h"
+
+static uint8 *CHRRAM;
+static uint32 CHRRAMSIZE;
+
+static int getPRGBank(int bank) {
+	if ((~bank & 1) && (MMC3_cmd & 0x40)) bank ^= 2;
+	return (bank & 2) ? 0xFE | (bank & 1) : DRegBuf[6 | (bank & 1)];
+}
+
+static void M393CW(uint32 A, uint8 V) {
+	if (EXPREGS[0] & 8)
+		setchr8r(0x10, 0);
+	else
+		setchr1(A, V & 0xFF | EXPREGS[0] << 8);
+}
+
+static void M393PW(uint32 A, uint8 V) {
+	switch ((EXPREGS[0] >> 4) & 3) {
+	case 0:
+	case 1:
+		setprg8(A, (V & 0x0F) | (EXPREGS[0] << 4));
+		break;
+	case 2:
+		setprg32(0x8000, ((getPRGBank(0) >> 2) & 3) | (EXPREGS[0] << 2));
+		break;
+	case 3:
+		setprg16(0x8000, (EXPREGS[0] << 3) | (EXPREGS[1] &7));
+		setprg16(0xC000, (EXPREGS[0] << 3) | 7);
+		break;
+	}
+}
+
+static DECLFW(M393Write8) {
+	switch (A & 0xE000) {
+	case 0x8000:
+	case 0xA000:
+		MMC3_CMDWrite(A, V);
+		break;
+	case 0xC000:
+	case 0xE000:
+		MMC3_IRQWrite(A, V);
+		break;
+	}
+
+	EXPREGS[1] = V;
+	FixMMC3CHR(MMC3_cmd);
+	FixMMC3PRG(MMC3_cmd);
+}
+
+static DECLFW(M393Write6) {
+	EXPREGS[0] = A & 0xFF;
+	FixMMC3PRG(MMC3_cmd);
+	FixMMC3CHR(MMC3_cmd);
+}
+
+static void M393Power(void) {
+	EXPREGS[0] = EXPREGS[1] = 0;
+	GenMMC3Power();
+	SetWriteHandler(0x6000, 0x7FFF, M393Write6);
+	SetWriteHandler(0x8000, 0xFFFF, M393Write8);
+}
+
+static void M393Reset(void) {
+	EXPREGS[0] = EXPREGS[1] = 0;
+	MMC3RegReset();
+}
+
+static void M393lose(void) {
+	GenMMC3Close();
+	if (CHRRAM)
+		FCEU_free(CHRRAM);
+	CHRRAM = NULL;
+}
+
+void Mapper393_Init(CartInfo *info) {
+	GenMMC3_Init(info, 1024, 512, 8, 0);
+	pwrap = M393PW;
+	cwrap = M393CW;
+	info->Power = M393Power;
+	info->Reset = M393Reset;
+	info->Close = M393lose;
+	CHRRAMSIZE = 8192;
+	CHRRAM = (uint8 *)FCEU_gmalloc(CHRRAMSIZE);
+	SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSIZE, 1);
+	AddExState(CHRRAM, CHRRAMSIZE, 0, "CHRR");
+
+	AddExState(EXPREGS, 1, 0, "EXPR");
+}