static void brickzn_decrypt()
{
	UINT8   *RAM    =   DrvZ80ROM0;
	size_t  size    =   0x50000;
	UINT8   *decrypt =  DrvZ80Decrypted;
	int i;


	memcpy(decrypt, RAM, size);
	for (i = 0; i < 0x50000; i++)
	{
		static const UINT8 opcode_swaptable[8] =
		{
			1,1,1,0,0,1,1,0
		};
		static const UINT8 data_swaptable[16] =
		{
			1,1,1,0,0,1,1,1,1,0,1,1,1,1,1,1
		};
		int opcode_swap = opcode_swaptable[((i & 0x00c) >> 2) | ((i & 0x040) >> 4)];
		int data_swap = (i >= 0x8000) ? 0 : data_swaptable[(i & 0x003) | ((i & 0x008) >> 1) | ((i & 0x400) >> 7)];
		UINT8 x = RAM[i];

		if (data_swap)
		{
			x = BITSWAP8(x, 7,6,5,4,3,2,0,1);
			RAM[i] = BITSWAP8(x, 7,2,3,4,5,6,1,0) ^ 0x10;
		}

		if (opcode_swap)
			x ^= 0x80;

		if (opcode_swap || data_swap)
			x = BITSWAP8(x, 7,2,3,4,5,6,1,0) ^ 0x10;

		decrypt[i] = x;

		// Alternate data decryption, activated at run-time. Store in higher banks.
		if (i >= 0x10000)
			RAM[i+0x40000] = RAM[i] ^ 0x44;
	}

	return decrypt;
}

DRIVER_INIT_MEMBER(suna8_state,brickzn)
{
	UINT8   *RAM    =   memregion("maincpu")->base();
	UINT8   *decrypt = brickzn_decrypt();
	int i;

	// Opcodes decrypted as data (to do: activated at run-time)
	for (i = 0; i < 0x8000; i++)
	{
		if (    ((i >= 0x072b) && (i <= 0x076f)) ||
				((i >= 0x45c5) && (i <= 0x45e4)) ||
				((i >= 0x7393) && (i <= 0x73ba)) ||
				((i >= 0x7a79) && (i <= 0x7aa9)) )
		{
			decrypt[i] = RAM[i];
		}
	}

	// !!!!!! PATCHES !!!!!!

	// To do: ROM banking should be disabled here
	decrypt[0x11bb] = 0x00; // LD ($C040),A -> NOP
	decrypt[0x11bc] = 0x00; // LD ($C040),A -> NOP
	decrypt[0x11bd] = 0x00; // LD ($C040),A -> NOP

	decrypt[0x3349] = 0xc9; // RET Z -> RET (to avoid: jp $C800)

	// NMI enable / source??
	decrypt[0x1431] = 0xc9; // HALT -> RET
	decrypt[0x24b5] = 0x00; // HALT -> NOP
	decrypt[0x2593] = 0x00; // HALT -> NOP

	// Data banks: 00-0f normal data decryption, 10-1f alternate data decryption:
	membank("bank1")->configure_entries(0, 16*2, memregion("maincpu")->base() + 0x10000, 0x4000);
	// Opcode banks: 00-1f normal opcode decryption:
	membank("bank1")->configure_decrypted_entries(0, 16, decrypt + 0x10000, 0x4000);
	membank("bank1")->configure_decrypted_entries(16, 16, decrypt + 0x10000, 0x4000);
}