//TIMER_DEVICE_CALLBACK_MEMBER(_1942_state::_1942_scanline)
void _1942_scanline(timer_device timer, object ptr, int param) // void *ptr, INT32 param)
{
int scanline = param;
if (scanline == 0x2c) // audio irq point 1
{
m_audiocpu.op0.set_input_line(0, HOLD_LINE);
}
if (scanline == 0x6d) // periodic irq (writes to the soundlatch and drives freeze dip-switch), + audio irq point 2
{
m_maincpu.op0.set_input_line_and_vector(0, HOLD_LINE, 0xcf); /* Z80 - RST 08h */
m_audiocpu.op0.set_input_line(0, HOLD_LINE);
}
if (scanline == 0xaf) // audio irq point 3
{
m_audiocpu.op0.set_input_line(0, HOLD_LINE);
}
if (scanline == 0xf0) // vblank-out irq, audio irq point 4
{
m_maincpu.op0.set_input_line_and_vector(0, HOLD_LINE, 0xd7); /* Z80 - RST 10h - vblank */
m_audiocpu.op0.set_input_line(0, HOLD_LINE);
}
}
//TIMER_DEVICE_CALLBACK_MEMBER(_1942_state::_1942_scanline)
public void _1942_scanline(timer_device timer, object ptr, int param) // void *ptr, INT32 param)
{
int scanline = param;
if (scanline == 240) // vblank-out irq
{
m_maincpu.target.set_input_line_and_vector(0, HOLD_LINE, 0xd7); /* RST 10h - vblank */
}
if (scanline == 0) // unknown irq event, presumably vblank-in or a periodic one (writes to the soundlatch and drives freeze dip-switch)
{
m_maincpu.target.set_input_line_and_vector(0, HOLD_LINE, 0xcf); /* RST 08h */
}
}
/*************************************
*
* Interrupts
*
*************************************/
//TIMER_DEVICE_CALLBACK_MEMBER(centiped_state::generate_interrupt)
public void generate_interrupt(timer_device timer, object ptr, int param) // void *ptr, INT32 param)
{
int scanline = param;
/* IRQ is clocked on the rising edge of 16V, equal to the previous 32V */
if ((scanline & 16) != 0)
{
m_maincpu.target.set_input_line(0, ((scanline - 1) & 32) != 0 ? ASSERT_LINE : CLEAR_LINE);
}
/* do a partial update now to handle sprite multiplexing (Maze Invaders) */
m_screen.target.update_partial(scanline);
}
/*************************************
*
* Older Williams interrupts
*
*************************************/
//TIMER_DEVICE_CALLBACK_MEMBER(williams_state::va11_callback)
protected virtual void va11_callback(timer_device timer, object ptr, int param)
{
throw new emu_unimplemented();
#if false
int scanline = param;
// must not fire at line 256
if (scanline == 256)
{
return;
}
/* the IRQ signal comes into CB1, and is set to VA11 */
m_pia[1]->cb1_w(BIT(scanline, 5));
#endif
}
//TIMER_DEVICE_CALLBACK_MEMBER(williams_state::count240_callback)
protected virtual void count240_callback(timer_device timer, object ptr, int param)
{
throw new emu_unimplemented();
#if false
#endif
}
