diff --git a/src/mame/cinematronics/jack.cpp b/src/mame/cinematronics/jack.cpp
index 45741f2be29..7bc4cbcbdc0 100644
--- a/src/mame/cinematronics/jack.cpp
+++ b/src/mame/cinematronics/jack.cpp
@@ -121,12 +121,6 @@ uint8_t jack_state::zzyzzyxx_timer_r()
 	return m_audiocpu->total_cycles() / 32;
 }
 
-IRQ_CALLBACK_MEMBER(jack_state::jack_sh_irq_ack)
-{
-	m_audiocpu->set_input_line(0, CLEAR_LINE);
-	return 0xff;
-}
-
 
 /***************************************************************/
 
@@ -957,7 +951,6 @@ void jack_state::jack(machine_config &config)
 	Z80(config, m_audiocpu, MASTER_XTAL / 6);
 	m_audiocpu->set_addrmap(AS_PROGRAM, &jack_state::sound_map);
 	m_audiocpu->set_addrmap(AS_IO, &jack_state::sound_io_map);
-	m_audiocpu->set_irq_acknowledge_callback(FUNC(jack_state::jack_sh_irq_ack));
 
 	/* video hardware */
 	SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
@@ -972,7 +965,7 @@ void jack_state::jack(machine_config &config)
 	SPEAKER(config, "mono").front_center();
 
 	GENERIC_LATCH_8(config, m_soundlatch);
-	m_soundlatch->data_pending_callback().set_inputline(m_audiocpu, 0, ASSERT_LINE);
+	m_soundlatch->data_pending_callback().set_inputline(m_audiocpu, 0, HOLD_LINE);
 
 	AY8910(config, m_aysnd, MASTER_XTAL / 12);
 	m_aysnd->port_a_read_callback().set(m_soundlatch, FUNC(generic_latch_8_device::read));
diff --git a/src/mame/cinematronics/jack.h b/src/mame/cinematronics/jack.h
index a7de37b3d8a..e5892ed0fb9 100644
--- a/src/mame/cinematronics/jack.h
+++ b/src/mame/cinematronics/jack.h
@@ -74,7 +74,6 @@ private:
 	int m_question_rom = 0;
 	int m_remap_address[16]{};
 
-	IRQ_CALLBACK_MEMBER(jack_sh_irq_ack);
 	void joinem_control_w(uint8_t data);
 	void joinem_scroll_w(offs_t offset, uint8_t data);
 	uint8_t striv_question_r(offs_t offset);