diff --git a/src/mame/drivers/namcos10.c b/src/mame/drivers/namcos10.c
index 34276ef1baa..3af6c3c0af2 100644
--- a/src/mame/drivers/namcos10.c
+++ b/src/mame/drivers/namcos10.c
@@ -462,7 +462,7 @@ READ16_MEMBER( namcos10_state::nand_data_r )
 	UINT16 data = nand_read2( nand_address * 2 );
 
 	//  logerror("read %08x = %04x\n", nand_address*2, data);
-	printf("read %08x = %04x\n", nand_address*2, data);
+	//printf("read %08x = %04x\n", nand_address*2, data);
 	  
 
 /*  printf( "data<-%08x (%08x)\n", data, nand_address ); */
diff --git a/src/mame/machine/ns10crypt.c b/src/mame/machine/ns10crypt.c
index 247d201cec3..91779b7260f 100644
--- a/src/mame/machine/ns10crypt.c
+++ b/src/mame/machine/ns10crypt.c
@@ -150,11 +150,11 @@ UINT16 ns10_decrypter_device::decrypt(UINT16 cipherword)
 	for (int j = 15; j >= 0; --j)
 	{
 		_mask <<= 1;
-		_mask ^= _reducer.gf2_reduce(_logic.eMask[j] & _previous_cipherwords);
-		_mask ^= _reducer.gf2_reduce(_logic.dMask[j] & _previous_plainwords);
+		_mask ^= _reducer->gf2_reduce(_logic.eMask[j] & _previous_cipherwords);
+		_mask ^= _reducer->gf2_reduce(_logic.dMask[j] & _previous_plainwords);
 	}
 	_mask ^= _logic.xMask;
-	_mask ^= _logic.nonlinear_calculation(_previous_cipherwords, _previous_plainwords, _reducer);
+	_mask ^= _logic.nonlinear_calculation(_previous_cipherwords, _previous_plainwords, *_reducer);
 
 	return plainword;
 }
@@ -162,6 +162,7 @@ UINT16 ns10_decrypter_device::decrypt(UINT16 cipherword)
 void ns10_decrypter_device::device_start()
 {
 	_active = false;
+	_reducer = auto_alloc(machine(), gf2_reducer());
 }
 
 void ns10_decrypter_device::init(int iv)
diff --git a/src/mame/machine/ns10crypt.h b/src/mame/machine/ns10crypt.h
index 0dbe3e85099..4aa7ad47266 100644
--- a/src/mame/machine/ns10crypt.h
+++ b/src/mame/machine/ns10crypt.h
@@ -44,7 +44,7 @@ private:
 	bool _active;
 	const ns10_crypto_logic& _logic;
 	static const int initSbox[16];
-	const gf2_reducer _reducer;
+	const gf2_reducer *_reducer;
 
 	void device_start();
 	void init(int iv);