static TIMER_CALLBACK( interrupt_timer )
{
/* 128V, 64V and 32V go to D */
TTL7474_d_w(0, (param & 0xe0) != 0xe0);
/* 16V clocks the flip-flop */
TTL7474_clock_w(0, param & 0x10);
param = (param + 0x10) & 0xff;
timer_adjust(int_timer, video_screen_get_time_until_pos(0, param, 0), param, attotime_zero);
TTL7474_update(0);
}
static void interrupt_timer(int param)
{
/* 128V, 64V and 32V go to D */
TTL7474_d_w(0, (param & 0xe0) != 0xe0);
/* 16V clocks the flip-flop */
TTL7474_clock_w(0, param & 0x10);
param = (param + 0x10) & 0xff;
timer_adjust(int_timer, cpu_getscanlinetime(param), param, 0);
TTL7474_update(0);
}
static void machine_reset_common( int line )
{
irq_line = line;
/* initalize main CPU interrupt generator flip-flops */
TTL7474_config(0, &galaxian_7474_9M_2_intf);
TTL7474_preset_w(0, 1);
TTL7474_clear_w (0, 1);
TTL7474_config(1, &galaxian_7474_9M_1_intf);
TTL7474_clear_w (1, 1);
TTL7474_d_w (1, 0);
TTL7474_preset_w(1, 0);
/* start a timer to generate interrupts */
int_timer = timer_alloc(interrupt_timer, NULL);
timer_adjust(int_timer, video_screen_get_time_until_pos(0, 0, 0), 0, attotime_zero);
}
static void machine_reset_common( int line )
{
irq_line = line;
/* initalize main CPU interrupt generator flip-flops */
TTL7474_config(0, &galaxian_7474_9M_2_intf);
TTL7474_preset_w(0, 1);
TTL7474_clear_w (0, 1);
TTL7474_config(1, &galaxian_7474_9M_1_intf);
TTL7474_clear_w (1, 1);
TTL7474_d_w (1, 0);
TTL7474_preset_w(1, 0);
/* start a timer to generate interrupts */
int_timer = timer_alloc(interrupt_timer);
timer_adjust(int_timer, cpu_getscanlinetime(0), 0, 0);
}
static void machine_reset_common(running_machine *machine, int line)
{
irq_line = line;
/* initalize main CPU interrupt generator flip-flops */
TTL7474_config(0, &galaxold_7474_9M_2_intf);
TTL7474_preset_w(0, 1);
TTL7474_clear_w (0, 1);
TTL7474_config(1, &galaxold_7474_9M_1_intf);
TTL7474_clear_w (1, 1);
TTL7474_d_w (1, 0);
TTL7474_preset_w(1, 0);
/* start a timer to generate interrupts */
int_timer = timer_alloc(interrupt_timer, NULL);
timer_adjust_oneshot(int_timer, video_screen_get_time_until_pos(machine->primary_screen, 0, 0), 0);
}
