comad/zerozone.cpp: Reduced audio CPU ROM region size to match mapped area. (#15294)

Also use BIT helper to extract bits.

Author: cam900

src/mame/comad/zerozone.cpp

@@ -3,12 +3,14 @@
 
 /*********************************************************************************
 
-    Zero Zone memory map
+    Zero Zone hardware
 
     driver by Brad Oliver
 
     CPU 1 : 68000, uses irq 1
 
+	memory map :
+
     0x000000 - 0x01ffff : ROM
     0x080000 - 0x08000f : input ports and dipswitches
     0x088000 - 0x0881ff : palette RAM, 256 total colors
@@ -137,8 +139,8 @@ TILE_GET_INFO_MEMBER(zerozone_state::get_tile_info)
 	int tileno = m_vram[tile_index] & 0x07ff;
 	int const colour = m_vram[tile_index] & 0xf000;
 
-	if (m_vram[tile_index] & 0x0800)
-		tileno += m_tilebank * 0x800;
+	if (BIT(m_vram[tile_index], 11))
+		tileno += m_tilebank << 11;
 
 	tileinfo.set(0, tileno, colour >> 12, 0);
 }
@@ -157,7 +159,6 @@ uint32_t zerozone_state::screen_update(screen_device &screen, bitmap_ind16 &bitm
 }
 
 
-
 void zerozone_state::sound_w(uint8_t data)
 {
 	m_soundlatch->write(data);
@@ -260,7 +261,7 @@ INPUT_PORTS_END
 
 
 static GFXDECODE_START( gfx_zerozone )
-	GFXDECODE_ENTRY( "gfx", 0, gfx_8x8x4_packed_msb, 0, 256 )         // sprites & playfield
+	GFXDECODE_ENTRY( "gfx", 0, gfx_8x8x4_packed_msb, 0, 16 ) // tilemap only
 GFXDECODE_END
 
 
@@ -316,7 +317,6 @@ void zerozone_state::zerozone(machine_config &config)
 }
 
 
-
 /***************************************************************************
 
   Game driver(s)
@@ -328,7 +328,7 @@ ROM_START( zerozone ) // PCB 'COMAD MADE IN KOREA 93 EDIT00', sticker 'COMAD-078
 	ROM_LOAD16_BYTE( "zz-4.rom", 0x0000, 0x10000, CRC(83718b9b) SHA1(b3fc6da5816142b9c92a7b8615eb5bcb2c78ea46) )
 	ROM_LOAD16_BYTE( "zz-5.rom", 0x0001, 0x10000, CRC(18557f41) SHA1(6ef908732b7775c1ea2b33f799635075db5756de) )
 
-	ROM_REGION( 0x10000, "audiocpu", 0 )
+	ROM_REGION( 0x08000, "audiocpu", 0 )
 	ROM_LOAD( "zz-1.rom", 0x00000, 0x08000, CRC(223ccce5) SHA1(3aa25ca914960b929dc853d07a958ed874e42fee) )
 
 	ROM_REGION( 0x080000, "gfx", 0 )
@@ -348,7 +348,7 @@ ROM_START( lvgirl94 ) // PCB 'COMAD MADE IN KOREA 93 EDIT00', sticker 'COMAD-078
 	ROM_LOAD( "rom6", 0x00000, 0x40000, CRC(eeeb94ba) SHA1(9da09312c090ef2d40f596247d9a7decf3724e54) )
 
 	// sound ROMs are the same as zerozone
-	ROM_REGION( 0x10000, "audiocpu", 0 )
+	ROM_REGION( 0x08000, "audiocpu", 0 )
 	ROM_LOAD( "rom1", 0x00000, 0x08000, CRC(223ccce5) SHA1(3aa25ca914960b929dc853d07a958ed874e42fee) )
 
 	ROM_REGION( 0x40000, "oki", 0 )      // ADPCM samples