static TIMER_CALLBACK( mcr68_493_callback )
{
v493_irq_state = 1;
update_mcr68_interrupts();
timer_set(video_screen_get_scan_period(machine->primary_screen), NULL, 0, mcr68_493_off_callback);
logerror("--- (INT1) ---\n");
}
static MACHINE_RESET( beathead )
{
/* reset the common subsystems */
atarigen_eeprom_reset();
atarigen_interrupt_reset(update_interrupts);
atarijsa_reset();
/* the code is temporarily mapped at 0 at startup */
/* just copying the first 0x40 bytes is sufficient */
memcpy(ram_base, rom_base, 0x40);
/* compute the timing of the HBLANK interrupt and set the first timer */
hblank_offset = attotime_to_double(video_screen_get_scan_period(machine->primary_screen)) * ((455. - 336. - 25.) / 455.);
timer_set(machine, double_to_attotime(attotime_to_double(video_screen_get_time_until_pos(machine->primary_screen, 0, 0)) - hblank_offset), NULL, 0, scanline_callback);
/* reset IRQs */
irq_line_state = CLEAR_LINE;
irq_state[0] = irq_state[1] = irq_state[2] = 0;
irq_enable[0] = irq_enable[1] = irq_enable[2] = 0;
}