static WRITE8_HANDLER( xain_sharedram_w )
{
/* locations 003d and 003e are used as a semaphores between CPU A and B, */
/* so let's resync every time they are changed to avoid deadlocks */
if ((offset == 0x003d || offset == 0x003e)
&& xain_sharedram[offset] != data)
cpu_boost_interleave(attotime_zero, ATTOTIME_IN_USEC(20));
xain_sharedram[offset] = data;
}
static WRITE16_HANDLER( fuuki16_sound_command_w )
{
if (ACCESSING_LSB)
{
soundlatch_w(0,data & 0xff);
cpunum_set_input_line(1, INPUT_LINE_NMI, PULSE_LINE);
// cpu_spinuntil_time(TIME_IN_USEC(50)); // Allow the other CPU to reply
cpu_boost_interleave(0, TIME_IN_USEC(50)); // Fixes glitching in rasters
}
}
static TIMER_CALLBACK( main_callback )
{
if (port_A & 0x80)
logerror ("Sound data not read %x\n",sound_data);
port_A |= 0x80; /* command from main cpu pending */
sound_data = param;
cpu_boost_interleave(attotime_zero, ATTOTIME_IN_USEC(100));
if (PA7_irq)
cpunum_set_input_line(machine, 1, M6809_IRQ_LINE, ASSERT_LINE);
}
static void sound_command_w(int data)
{
exidy440_sound_command = data;
exidy440_sound_command_ack = 0;
cpunum_set_input_line(1, INPUT_LINE_IRQ1, ASSERT_LINE);
/* It is important that the sound cpu ACKs the sound command
quickly. Otherwise the main CPU gives up with sound. Boosting
the interleave for a while helps. */
cpu_boost_interleave(0, TIME_IN_USEC(100));
}
static WRITE8_HANDLER( qixmcu_coinctrl_w )
{
if (data & 0x04)
{
cpunum_set_input_line(3, M6809_IRQ_LINE, ASSERT_LINE);
/* temporarily boost the interleave to sync things up */
/* note: I'm using 50 because 30 is not enough for space dungeon at game over */
cpu_boost_interleave(0, TIME_IN_USEC(50));
}
else
cpunum_set_input_line(3, M6809_IRQ_LINE, CLEAR_LINE);
/* this is a callback called by pia_0_w(), so I don't need to synchronize */
/* the CPUs - they have already been synchronized by qix_pia_0_w() */
qix_coinctrl = data;
}
static TIMER_CALLBACK( sound_callback )
{
port_A |= 0x40; /* result from sound cpu pending */
main_data = param;
cpu_boost_interleave(attotime_zero, ATTOTIME_IN_USEC(100));
}
static WRITE8_HANDLER(protection_w)
{
timer_call_after_resynch(NULL, data, protection_deferred_w);
cpu_boost_interleave(attotime_zero, ATTOTIME_IN_USEC(100));
}
