Sound Hardware

00pw	AY0ADDRESS	Address for AY0
00pr	SOUNDCMD	Command from main CPU
01pw	AY0VALUE	Value for AY0
02pw	AY1ADDRESS	Address for AY1
03pw	AY1VALUE	Value for AY1

 /* audio CPU */
 /* XTAL101 Crystal @ 12mhz */
 /* through 74LS161, Pin 12 = divide by 8 */
 /* Fed to CPU as 1.5mhz though line J4-D */
 MDRV_CPU_ADD("audiocpu", Z80,12000000/8)
 MDRV_CPU_PROGRAM_MAP(sound_map, 0)
 MDRV_CPU_IO_MAP(sound_port, 0)
 MDRV_CPU_PERIODIC_INT(nmi_line_pulse,250)