Change mapper 293 back (as per request)

src/mappers/mapper293.c

@@ -30,7 +30,7 @@ static SFORMAT StateRegs[] = {
 	{ 0 }
 };
 
-static void Sync(void) {
+static void M293Sync(void) {
 	uint8 mode = ((reg[0] >> 2) & 0x02) | ((reg[1] >> 6) & 0x01);
 	uint8 base = ((reg[1] << 5) & 0x20) | ((reg[1] >> 1) & 0x18);
 	uint8 bank = (reg[0] & 0x07);
@@ -49,15 +49,14 @@ static void Sync(void) {
 		setprg16(0xC000, base | bank);
 		break;
 	case 3: /* NROM-256 */
-		setprg16(0x8000, (base | bank) & 0xFE);
-		setprg16(0xC000, (base | bank) | 1);
+		setprg32(0x8000, (base | bank) >> 1);
 		break;
 	}
 	setchr8(0);
 	setmirror(((reg[1] >> 7) & 0x01) ^ 0x01);
 }
 
-static DECLFW(M293Write) {
+static void M293Write(uint32 A, uint8 V) {
 	if (!(A & 0x2000)) {
 		/* First Banking Register ($8000-$9FFF, $C000-$DFFF) */
 		reg[0] = V;
@@ -68,15 +67,33 @@ static DECLFW(M293Write) {
 	}
 }
 
+static void M293Write1(uint16 A, uint8 V) {
+	reg[0] = V;
+	reg[1] = V;
+	M293Sync();
+}
+
+static void M293Write2(uint16 A, uint8 V) {
+	reg[1] = V;
+	M293Sync();
+}
+
+static void M293Write3(uint16 A, uint8 V) {
+	reg[0] = V;
+	M293Sync();
+}
+
 static void M293Power(void) {
 	reg[0] = reg[1] = 0;
-	Sync();
+	M293Sync();
 	SetReadHandler(0x8000, 0xFFFF, CartBR);
-	SetWriteHandler(0x8000, 0xDFFF, M293Write);
+	SetWriteHandler(0x8000, 0x9FFF, M293Write1);
+	SetWriteHandler(0xA000, 0xBFFF, M293Write2);
+	SetWriteHandler(0xC000, 0xDFFF, M293Write3);
 }
 
 static void StateRestore(int version) {
-	Sync();
+	M293Sync();
 }
 
 /* BMC 12-in-1/76-in-1 (NewStar) (Unl) */