Minor hack to fix start countdown sound bug in the Buggy Boys [Phil Bennett]

src/mame/drivers/tx1.c

@@ -41,6 +41,7 @@
 #include "driver.h"
 #include "cpu/z80/z80.h"
 #include "cpu/i86/i86.h"
+#include "machine/8255ppi.h"
 #include "sound/ay8910.h"
 #include "rendlay.h"
 #include "tx1.h"
@@ -825,14 +826,8 @@ static MACHINE_DRIVER_START( buggybjr )
 
 	MDRV_SCREEN_ADD("screen", RASTER)
 	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
-#if 0
+
 	MDRV_SCREEN_RAW_PARAMS(BB_PIXEL_CLOCK, BB_HTOTAL, BB_HBEND, BB_HBSTART, BB_VTOTAL, BB_VBEND, BB_VBSTART)
-#else
-	MDRV_SCREEN_REFRESH_RATE(54.10)
-	MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(3072))
-	MDRV_SCREEN_SIZE(256, 256)
-	MDRV_SCREEN_VISIBLE_AREA(0, 255, 0, 239)
-#endif
 
 	MDRV_PALETTE_LENGTH(256)
 	MDRV_PALETTE_INIT(buggyboy)

src/mame/includes/tx1.h

@@ -3,7 +3,6 @@
     TX-1/Buggy Boy hardware
 
 *************************************************************************/
-#include "machine/8255ppi.h"
 
 #define TX1_PIXEL_CLOCK		(XTAL_18MHz / 3)
 #define TX1_HBSTART			256
@@ -13,13 +12,18 @@
 #define TX1_VBEND			0
 #define TX1_VTOTAL			264
 
+/*
+ * HACK! Increased VTOTAL to 'fix' a timing issue
+ * that prevents one of the start countdown tones
+ * from playing.
+ */
 #define BB_PIXEL_CLOCK		(XTAL_18MHz / 3)
 #define BB_HBSTART			256
 #define BB_HBEND			0
 #define BB_HTOTAL			384
 #define BB_VBSTART			240
 #define BB_VBEND			0
-#define BB_VTOTAL			288
+#define BB_VTOTAL			288 + 1
 
 #define CPU_MASTER_CLOCK	(XTAL_15MHz)
 #define BUGGYBOY_ZCLK		(CPU_MASTER_CLOCK / 2)

src/mame/machine/tx1.c

@@ -3,9 +3,9 @@
     Tatsumi TX-1/Buggy Boy machine hardware
 
 ***************************************************************************/
+
 #include "driver.h"
 #include "debugger.h"
-#include "machine/8255ppi.h"
 #include "tx1.h"