diff --git a/src/mame/drivers/raiden2.c b/src/mame/drivers/raiden2.c
index 8787fdb588f..834c9c2fca6 100644
--- a/src/mame/drivers/raiden2.c
+++ b/src/mame/drivers/raiden2.c
@@ -2061,6 +2061,11 @@ static DRIVER_INIT (raiden2)
 	raiden2_decrypt_sprites(machine);
 }
 
+static DRIVER_INIT (nzerotea)
+{
+	raiden2_decrypt_sprites(machine);
+}
+
 static DRIVER_INIT (xsedae)
 {
 	memory_configure_bank(machine, "mainbank", 0, 2, memory_region(machine, "mainprg"), 0x20000);
@@ -2315,7 +2320,7 @@ GAME( 1993, zeroteams,zeroteam,raiden2,  raiden2,  raiden2,  ROT0,   "Seibu Kaih
 GAME( 1995, xsedae,   0,       raiden2,  raiden2,  xsedae,   ROT0,   "Dream Island",   "X Se Dae Quiz", GAME_NOT_WORKING|GAME_NO_SOUND)
 
 // 'V33 system type_b' - uses V33 CPU, COPX-D3 external protection rom, but still has the proper sound system
-GAME( 1993, nzerotea, zeroteam,  nzerotea, nzerotea,  raiden2,  ROT0,   "Seibu Kaihatsu", "New Zero Team", GAME_NOT_WORKING|GAME_NO_SOUND) // this uses a v33 and COPD3
+GAME( 1993, nzerotea, zeroteam,  nzerotea, nzerotea,  nzerotea,  ROT0,   "Seibu Kaihatsu", "New Zero Team", GAME_NOT_WORKING|GAME_NO_SOUND) // this uses a v33 and COPD3
 
 // newer PCB, with V33 CPU and COPD3 protection, but weak sound hardware. - was marked as Raiden DX New in the rom dump, but boots as Raiden 2 New version, is it switchable?
 GAME( 1996, r2dx_v33, 0, rdx_v33,  rdx_v33, rdx_v33,  ROT270, "Seibu Kaihatsu", "Raiden II / DX (newer V33 PCB)", GAME_NOT_WORKING|GAME_NO_SOUND)
diff --git a/src/mame/drivers/segaorun.c b/src/mame/drivers/segaorun.c
index 4f4fcc59cad..fc3d81275fa 100644
--- a/src/mame/drivers/segaorun.c
+++ b/src/mame/drivers/segaorun.c
@@ -416,7 +416,9 @@ static void outrun_generic_init(running_machine *machine)
 	state->subcpu = machine->device("sub");
 	state->ppi8255 = machine->device("ppi8255");
 	
-	machine->device<nvram_device>("nvram")->set_base(workram, 0x8000);
+	nvram_device *nvram = machine->device<nvram_device>("nvram");
+	if (nvram != NULL)
+		nvram->set_base(workram, 0x8000);
 
 	state_save_register_global(machine, state->adc_select);
 	state_save_register_global(machine, state->vblank_irq_state);
@@ -1129,7 +1131,6 @@ static MACHINE_CONFIG_START( outrun_base, segas1x_state )
 	MDRV_VIDEO_START(outrun)
 	MDRV_VIDEO_UPDATE(outrun)
 
-
 	/* sound hardware */
 	MDRV_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")
 
diff --git a/src/mame/drivers/vamphalf.c b/src/mame/drivers/vamphalf.c
index 05cbe91e08f..6650659c6ce 100644
--- a/src/mame/drivers/vamphalf.c
+++ b/src/mame/drivers/vamphalf.c
@@ -1873,6 +1873,7 @@ static DRIVER_INIT( mrkicker )
 	finalgdr_backupram_bank = 1;
 	finalgdr_backupram = auto_alloc_array(machine, UINT8, 0x80*0x100);
 //  memory_install_read32_handler(cputag_get_address_space(machine, "maincpu", ADDRESS_SPACE_PROGRAM), 0x005e874, 0x005e877, 0, 0, mrkicker_speedup_r );
+	machine->device<nvram_device>("nvram")->set_base(finalgdr_backupram, 0x80*0x100);
 
 	palshift = 0;
 	flip_bit = 1; //?