diff --git a/src/mame/misc/skyarmy.cpp b/src/mame/misc/skyarmy.cpp
index 1be842bb29e..823405d5e86 100644
--- a/src/mame/misc/skyarmy.cpp
+++ b/src/mame/misc/skyarmy.cpp
@@ -25,9 +25,12 @@
 */
 
 #include "emu.h"
+
 #include "cpu/z80/z80.h"
 #include "machine/74259.h"
+#include "machine/timer.h"
 #include "sound/ay8910.h"
+
 #include "emupal.h"
 #include "screen.h"
 #include "speaker.h"
@@ -80,7 +83,7 @@ private:
 
 	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 
-	INTERRUPT_GEN_MEMBER(nmi_source);
+	TIMER_DEVICE_CALLBACK_MEMBER(scanline);
 	void skyarmy_io_map(address_map &map) ATTR_COLD;
 	void skyarmy_map(address_map &map) ATTR_COLD;
 };
@@ -180,10 +183,17 @@ uint32_t skyarmy_state::screen_update(screen_device &screen, bitmap_ind16 &bitma
 	return 0;
 }
 
-INTERRUPT_GEN_MEMBER(skyarmy_state::nmi_source)
+TIMER_DEVICE_CALLBACK_MEMBER(skyarmy_state::scanline)
 {
-	if (m_nmi)
+	int scanline = param;
+
+	// 16 NMIs per frame
+	if ((scanline & 0xf) == 0 && scanline <= 240 && m_nmi)
 		m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
+
+	// vblank interrupt
+	if (scanline == 248)
+		m_maincpu->set_input_line(0, HOLD_LINE);
 }
 
 
@@ -313,11 +323,11 @@ GFXDECODE_END
 
 void skyarmy_state::skyarmy(machine_config &config)
 {
-	Z80(config, m_maincpu, 4000000);
+	Z80(config, m_maincpu, 18.432_MHz_XTAL / 6);
 	m_maincpu->set_addrmap(AS_PROGRAM, &skyarmy_state::skyarmy_map);
 	m_maincpu->set_addrmap(AS_IO, &skyarmy_state::skyarmy_io_map);
-	m_maincpu->set_vblank_int("screen", FUNC(skyarmy_state::irq0_line_hold));
-	m_maincpu->set_periodic_int(FUNC(skyarmy_state::nmi_source), attotime::from_hz(650));
+
+	TIMER(config, "scanline").configure_scanline(FUNC(skyarmy_state::scanline), "screen", 0, 1);
 
 	ls259_device &latch(LS259(config, "latch")); // 11C
 	latch.q_out_cb<0>().set(FUNC(skyarmy_state::coin_counter_w));
@@ -328,10 +338,7 @@ void skyarmy_state::skyarmy(machine_config &config)
 
 	/* video hardware */
 	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
-	screen.set_refresh_hz(60);
-	screen.set_vblank_time(ATTOSECONDS_IN_USEC(0));
-	screen.set_size(32*8,32*8);
-	screen.set_visarea(0*8,32*8-1,1*8,31*8-1);
+	screen.set_raw(18.432_MHz_XTAL / 3, 384, 0, 256, 264, 8, 248);
 	screen.set_screen_update(FUNC(skyarmy_state::screen_update));
 	screen.set_palette(m_palette);
 
@@ -340,8 +347,8 @@ void skyarmy_state::skyarmy(machine_config &config)
 
 	/* sound hardware */
 	SPEAKER(config, "mono").front_center();
-	AY8910(config, "ay0", 2500000).add_route(ALL_OUTPUTS, "mono", 0.15);
-	AY8910(config, "ay1", 2500000).add_route(ALL_OUTPUTS, "mono", 0.15);
+	AY8910(config, "ay0", 18.432_MHz_XTAL / 12).add_route(ALL_OUTPUTS, "mono", 0.5);
+	AY8910(config, "ay1", 18.432_MHz_XTAL / 12).add_route(ALL_OUTPUTS, "mono", 0.5);
 }