diff --git a/src/mame/access/acvirus.cpp b/src/mame/access/acvirus.cpp
index ae4339f71b58c..d88618d3e745b 100644
--- a/src/mame/access/acvirus.cpp
+++ b/src/mame/access/acvirus.cpp
@@ -70,6 +70,7 @@
 #include "cpu/mcs51/sab80c535.h"
 #include "machine/intelfsh.h"
 #include "video/hd44780.h"
+#include "video/pwm.h"
 
 #include "emupal.h"
 #include "speaker.h"
@@ -91,8 +92,10 @@ class acvirus_state : public driver_device
 		m_rombank(*this, "rombank"),
 		m_row(*this, "ROW%u", 0U),
 		m_knob(*this, "knob_%u", 0U),
+		m_leds(*this, "leds"),
 		m_scan(0),
-		m_an_select(0)
+		m_an_select(0),
+		m_led_pattern(0)
 	{ }
 
 	void virusa(machine_config &config) ATTR_COLD;
@@ -122,6 +125,7 @@ class acvirus_state : public driver_device
 	u8 p4_r();
 	void p1_w(u8 data);
 	void p3_w(u8 data);
+	void p4_w(u8 data);
 	void p5_w(u8 data);
 
 	u8 p402_r();
@@ -129,9 +133,11 @@ class acvirus_state : public driver_device
 	void palette_init(palette_device &palette) ATTR_COLD;
 
 	required_ioport_array<32> m_knob;
+	optional_device<pwm_display_device> m_leds;
 
 	u8 m_scan;
 	u8 m_an_select;
+	u8 m_led_pattern;
 };
 
 
@@ -142,6 +148,7 @@ void acvirus_state::machine_start()
 
 	save_item(NAME(m_scan));
 	save_item(NAME(m_an_select));
+	save_item(NAME(m_led_pattern));
 }
 
 void acvirus_state::machine_reset()
@@ -171,10 +178,20 @@ u8 acvirus_state::p4_r()
 	return m_row[m_scan & 3]->read();
 }
 
+void acvirus_state::p4_w(u8 data)
+{
+	m_leds->write_mx(data);
+
+	if (BIT(m_scan, 3))
+		m_led_pattern = data;
+}
+
 void acvirus_state::p5_w(u8 data)
 {
-	m_scan = data & 7;
 	m_rombank->set_entry((data >> 4) & 15);
+
+	m_scan = data & 15;
+	m_leds->matrix(1 << m_scan, m_led_pattern);
 }
 
 void acvirus_state::prog_map(address_map &map)
@@ -185,8 +202,9 @@ void acvirus_state::prog_map(address_map &map)
 
 void acvirus_state::data_map(address_map &map)
 {
+	map(0x0000, 0x7fff).ram();
 	map(0x0400, 0x0407).rw(m_dsp, FUNC(dsp563xx_device::hi08_r), FUNC(dsp563xx_device::hi08_w));
-	map(0x2000, 0x7fff).ram(); // TODO: RAM banks
+	map(0x8000, 0xffff).ram(); // TODO: RAM banks
 }
 
 void acvirus_state::dsp_p_map(address_map &map)
@@ -260,6 +278,7 @@ void acvirus_state::virusb(machine_config &config)
 	m_maincpu->port_out_cb<1>().set(FUNC(acvirus_state::p1_w));
 	m_maincpu->port_out_cb<3>().set(FUNC(acvirus_state::p3_w));
 	m_maincpu->port_in_cb<4>().set(FUNC(acvirus_state::p4_r));
+	m_maincpu->port_out_cb<4>().set(FUNC(acvirus_state::p4_w));
 	m_maincpu->port_out_cb<5>().set(FUNC(acvirus_state::p5_w));
 	m_maincpu->an0_func().set([this] { return m_knob[4*0 + m_an_select]->read(); });
 	m_maincpu->an1_func().set([this] { return m_knob[4*1 + m_an_select]->read(); });
@@ -283,6 +302,8 @@ void acvirus_state::virusb(machine_config &config)
 	HD44780(config, m_lcdc, 270000); // TODO: clock not measured, datasheet typical clock used
 	m_lcdc->set_lcd_size(2, 16);
 
+	PWM_DISPLAY(config, m_leds).set_size(8, 8);
+
 	DSP56311(config, m_dsp, 108_MHz_XTAL);
 	m_dsp->set_addrmap(dsp563xx_device::AS_P, &acvirus_state::dsp_p_map);
 	m_dsp->set_addrmap(dsp563xx_device::AS_X, &acvirus_state::dsp_x_map);
diff --git a/src/mame/layout/virusb.lay b/src/mame/layout/virusb.lay
index c408792f1ff27..eaa737cebebb3 100644
--- a/src/mame/layout/virusb.lay
+++ b/src/mame/layout/virusb.lay
@@ -600,11 +600,11 @@ license:CC0-1.0
 		<element ref="0_text"><bounds x="137" y="462" width="7" height="12"/></element>
 		<element ref="plus1_text"><bounds x="151" y="462" width="12" height="12"/></element>
 		<element ref="plus2_text"><bounds x="169" y="462" width="12" height="12"/></element>
-		<element ref="led" name="LED0"><bounds x="98.5" y="476" width="11" height="11"/></element>
-		<element ref="led" name="LED1"><bounds x="116.5" y="476" width="11" height="11"/></element>
-		<element ref="led" name="LED2"><bounds x="134.5" y="476" width="11" height="11"/></element>
-		<element ref="led" name="LED3"><bounds x="152.5" y="476" width="11" height="11"/></element>
-		<element ref="led" name="LED4"><bounds x="170.5" y="476" width="11" height="11"/></element>
+		<element ref="led" name="2.0"><bounds x="98.5" y="476" width="11" height="11"/></element>
+		<element ref="led" name="2.7"><bounds x="116.5" y="476" width="11" height="11"/></element>
+		<element ref="led" name="3.0"><bounds x="134.5" y="476" width="11" height="11"/></element>
+		<element ref="led" name="3.7"><bounds x="152.5" y="476" width="11" height="11"/></element>
+		<element ref="led" name="2.3"><bounds x="170.5" y="476" width="11" height="11"/></element>
 		<element ref="button" inputtag="ROW2" inputmask="0x01"><!-- TRANSPOSE [-] --><bounds x="95" y="495" width="45" height="45"/></element>
 		<element ref="button" inputtag="ROW2" inputmask="0x02"><!-- TRANSPOSE [+] --><bounds x="140" y="495" width="45" height="45"/></element>
 		<element ref="transpose_text"><bounds x="106" y="547" width="66" height="12"/></element>
@@ -621,16 +621,16 @@ license:CC0-1.0
 		<group ref="knob"><bounds x="209" y="115" width="77" height="77"/></group>
 		<element ref="rate_text"><bounds x="235" y="196" width="28" height="12"/></element>
 
-		<element ref="led" name="LED5"><bounds x="292" y="108" width="11" height="11"/></element>
+		<element ref="led" name="7.a"><bounds x="292" y="108" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW2" inputmask="0x20"><!-- SHAPE --><bounds x="320" y="142" width="45" height="45"/></element>
 		<element ref="shape_text"><bounds x="325" y="196" width="36" height="12"/></element>
 
-		<element ref="led" name="LED6"><bounds x="380" y="124" width="11" height="11"/></element>
-		<element ref="led" name="LED7"><bounds x="380" y="141" width="11" height="11"/></element>
-		<element ref="led" name="LED8"><bounds x="380" y="159" width="11" height="11"/></element>
-		<element ref="led" name="LED9"><bounds x="380" y="177" width="11" height="11"/></element>
-		<element ref="led" name="LED10"><bounds x="380" y="194" width="11" height="11"/></element>
+		<element ref="led" name="5.5"><bounds x="380" y="124" width="11" height="11"/></element>
+		<element ref="led" name="5.7"><bounds x="380" y="141" width="11" height="11"/></element>
+		<element ref="led" name="4.7"><bounds x="380" y="159" width="11" height="11"/></element>
+		<element ref="led" name="4.5"><bounds x="380" y="177" width="11" height="11"/></element>
+		<element ref="led" name="4.0"><bounds x="380" y="194" width="11" height="11"/></element>
 
 		<element ref="sin_wave"><bounds x="397" y="122" width="21" height="13"/></element>
 		<element ref="triangle_wave"><bounds x="398" y="141" width="20" height="12"/></element>
@@ -638,8 +638,8 @@ license:CC0-1.0
 		<element ref="square_wave"><bounds x="399" y="176" width="19" height="13"/></element>
 		<element ref="wave_text"><bounds x="394" y="194" width="29" height="12"/></element>
 
-		<element ref="led" name="LED11"><bounds x="247" y="230" width="11" height="11"/></element>
-		<element ref="led" name="LED12"><bounds x="292" y="230" width="11" height="11"/></element>
+		<element ref="led" name="0.0"><bounds x="247" y="230" width="11" height="11"/></element>
+		<element ref="led" name="0.2"><bounds x="292" y="230" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW0" inputmask="0x01"><!-- EDIT --><bounds x="230" y="249" width="45" height="45"/></element>
 		<element ref="button" inputtag="ROW0" inputmask="0x04"><!-- ENV MODE --><bounds x="275" y="249" width="45" height="45"/></element>
@@ -651,11 +651,11 @@ license:CC0-1.0
 		<element ref="amount_text"><bounds x="320" y="300" width="44" height="12"/></element>
 
 
-		<element ref="led" name="LED13"><bounds x="380" y="232" width="11" height="11"/></element>
-		<element ref="led" name="LED14"><bounds x="380" y="249" width="11" height="11"/></element>
-		<element ref="led" name="LED15"><bounds x="380" y="266" width="11" height="11"/></element>
-		<element ref="led" name="LED16"><bounds x="380" y="283" width="11" height="11"/></element>
-		<element ref="led" name="LED17"><bounds x="380" y="300" width="11" height="11"/></element>
+		<element ref="led" name="2.2"><bounds x="380" y="232" width="11" height="11"/></element>
+		<element ref="led" name="4.2"><bounds x="380" y="249" width="11" height="11"/></element>
+		<element ref="led" name="4.1"><bounds x="380" y="266" width="11" height="11"/></element>
+		<element ref="led" name="4.4"><bounds x="380" y="283" width="11" height="11"/></element>
+		<element ref="led" name="5.6"><bounds x="380" y="300" width="11" height="11"/></element>
 
 		<element ref="osc_1_text"><bounds x="394" y="232" width="36" height="12"/></element>
 		<element ref="osc_2_text"><bounds x="394" y="249" width="36" height="12"/></element>
@@ -670,16 +670,16 @@ license:CC0-1.0
 		<group ref="knob"><bounds x="209" y="360" width="77" height="77"/></group>
 		<element ref="rate_text"><bounds x="235" y="440" width="28" height="12"/></element>
 
-		<element ref="led" name="LED18"><bounds x="292" y="353" width="11" height="11"/></element>
+		<element ref="led" name="7.a"><bounds x="292" y="353" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW2" inputmask="0x08"><!-- SHAPE --><bounds x="320" y="386" width="45" height="45"/></element>
 		<element ref="shape_text"><bounds x="325" y="440" width="36" height="12"/></element>
 
-		<element ref="led" name="LED19"><bounds x="380" y="369" width="11" height="11"/></element>
-		<element ref="led" name="LED20"><bounds x="380" y="386" width="11" height="11"/></element>
-		<element ref="led" name="LED21"><bounds x="380" y="403" width="11" height="11"/></element>
-		<element ref="led" name="LED22"><bounds x="380" y="420" width="11" height="11"/></element>
-		<element ref="led" name="LED23"><bounds x="380" y="437" width="11" height="11"/></element>
+		<element ref="led" name="4.6"><bounds x="380" y="369" width="11" height="11"/></element>
+		<element ref="led" name="4.3"><bounds x="380" y="386" width="11" height="11"/></element>
+		<element ref="led" name="3.1"><bounds x="380" y="403" width="11" height="11"/></element>
+		<element ref="led" name="2.5"><bounds x="380" y="420" width="11" height="11"/></element>
+		<element ref="led" name="3.5"><bounds x="380" y="437" width="11" height="11"/></element>
 
 		<element ref="sin_wave"><bounds x="398" y="368" width="21" height="13"/></element>
 		<element ref="triangle_wave"><bounds x="398" y="387" width="20" height="12"/></element>
@@ -687,8 +687,8 @@ license:CC0-1.0
 		<element ref="square_wave"><bounds x="399" y="422" width="19" height="13"/></element>
 		<element ref="wave_text"><bounds x="398" y="438" width="29" height="12"/></element>
 
-		<element ref="led" name="LED24"><bounds x="247" y="476" width="11" height="11"/></element>
-		<element ref="led" name="LED25"><bounds x="292" y="476" width="11" height="11"/></element>
+		<element ref="led" name="0.3"><bounds x="247" y="476" width="11" height="11"/></element>
+		<element ref="led" name="0.6"><bounds x="292" y="476" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW0" inputmask="0x08"><!-- EDIT --><bounds x="230" y="495" width="45" height="45"/></element>
 		<element ref="button" inputtag="ROW0" inputmask="0x40"><!-- ENV MODE --><bounds x="275" y="495" width="45" height="45"/></element>
@@ -699,11 +699,11 @@ license:CC0-1.0
 		<element ref="mode_text"><bounds x="283" y="557" width="28" height="12"/></element>
 		<element ref="amount_text"><bounds x="320" y="547" width="44" height="12"/></element>
 
-		<element ref="led" name="LED26"><bounds x="380" y="478" width="11" height="11"/></element>
-		<element ref="led" name="LED27"><bounds x="380" y="495" width="11" height="11"/></element>
-		<element ref="led" name="LED28"><bounds x="380" y="512" width="11" height="11"/></element>
-		<element ref="led" name="LED29"><bounds x="380" y="529" width="11" height="11"/></element>
-		<element ref="led" name="LED30"><bounds x="380" y="547" width="11" height="11"/></element>
+		<element ref="led" name="2.1"><bounds x="380" y="478" width="11" height="11"/></element>
+		<element ref="led" name="3.6"><bounds x="380" y="495" width="11" height="11"/></element>
+		<element ref="led" name="2.6"><bounds x="380" y="512" width="11" height="11"/></element>
+		<element ref="led" name="3.4"><bounds x="380" y="529" width="11" height="11"/></element>
+		<element ref="led" name="2.4"><bounds x="380" y="547" width="11" height="11"/></element>
 
 		<element ref="shape_1plus2_text"><bounds x="394" y="479" width="47" height="12"/></element>
 		<element ref="filter_1_text"><bounds x="394" y="496" width="47" height="12"/></element>
@@ -752,8 +752,8 @@ license:CC0-1.0
 		<group ref="wave_sel_pill_text"><bounds x="613" y="301" width="50" height="13"/></group>
 		<element ref="slash_pw_text"><bounds x="666" y="302" width="22" height="12"/></element>
 
-		<element ref="led" name="LED31"><bounds x="733" y="230" width="11" height="11"/></element>
-		<element ref="led" name="LED32"><bounds x="778" y="230" width="11" height="11"/></element>
+		<element ref="led" name="1.0"><bounds x="733" y="230" width="11" height="11"/></element>
+		<element ref="led" name="1.5"><bounds x="778" y="230" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW1" inputmask="0x01"><!-- EDIT --><bounds x="716" y="249" width="45" height="45"/></element>
 		<element ref="button" inputtag="ROW1" inputmask="0x20"><!-- SYNC --><bounds x="761" y="249" width="45" height="45"/></element>
@@ -820,9 +820,9 @@ license:CC0-1.0
 		<element ref="button" inputtag="ROW2" inputmask="0x40"><!-- STORE --><bounds x="472" y="495" width="45" height="45"/></element>
 		<element ref="store_text"><bounds x="477" y="547" width="35" height="12"/></element>
 
-		<element ref="led" name="LED33"><bounds x="559" y="476" width="11" height="11"/></element>
-		<element ref="led" name="LED34"><bounds x="604" y="476" width="11" height="11"/></element>
-		<element ref="led" name="LED35"><bounds x="649" y="476" width="11" height="11"/></element>
+		<element ref="led" name="0.7"><bounds x="559" y="476" width="11" height="11"/></element>
+		<element ref="led" name="0.4"><bounds x="604" y="476" width="11" height="11"/></element>
+		<element ref="led" name="0.5"><bounds x="649" y="476" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW0" inputmask="0x80"><!-- EFFECTS --><bounds x="542" y="495" width="45" height="45"/></element>
 		<element ref="button" inputtag="ROW0" inputmask="0x10"><!-- DEMO: CTRL --><bounds x="587" y="495" width="45" height="45"/></element>
@@ -835,8 +835,8 @@ license:CC0-1.0
 		<element ref="gray_line"><bounds x="596" y="561" width="23" height="1"/></element>
 		<element ref="gray_line"><bounds x="645" y="561" width="23" height="1"/></element>
 
-		<element ref="led" name="LED36"><bounds x="715" y="476" width="11" height="11"/></element>
-		<element ref="led" name="LED37"><bounds x="760" y="476" width="11" height="11"/></element>
+		<element ref="led" name="0.1"><bounds x="715" y="476" width="11" height="11"/></element>
+		<element ref="led" name="1.3"><bounds x="760" y="476" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW0" inputmask="0x02"><!-- MULTI --><bounds x="698" y="495" width="45" height="45"/></element>
 		<element ref="button" inputtag="ROW1" inputmask="0x08"><!-- SINGLE --><bounds x="743" y="495" width="45" height="45"/></element>
@@ -897,7 +897,7 @@ license:CC0-1.0
 		<group ref="knob"><bounds x="1075" y="223" width="77" height="77"/></group>
 		<element ref="cutoff_2_text"><bounds x="1084" y="300" width="59" height="12"/></element>
 
-		<element ref="led" name="LED38"><bounds x="1197" y="230" width="11" height="11"/></element>
+		<element ref="led" name="1.1"><bounds x="1197" y="230" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW1" inputmask="0x02"><!-- EDIT --><bounds x="1180" y="249" width="45" height="45"/></element>
 		<element ref="edit_text"><bounds x="1188" y="300" width="29" height="12"/></element>
@@ -905,21 +905,21 @@ license:CC0-1.0
 		<element ref="button" inputtag="ROW3" inputmask="0x10"><!-- FILT 1 --><bounds x="1225" y="249" width="45" height="45"/></element>
 		<element ref="filt_1_text"><bounds x="1234" y="300" width="27" height="12"/></element>
 
-		<element ref="led" name="LED39"><bounds x="1284" y="230" width="11" height="11"/></element>
+		<element ref="led" name="5.1"><bounds x="1284" y="230" width="11" height="11"/></element>
 		<element ref="lp_text"><bounds x="1300" y="230" width="13" height="12"/></element>
-		<element ref="led" name="LED40"><bounds x="1284" y="248" width="11" height="11"/></element>
+		<element ref="led" name="5.0"><bounds x="1318" y="230" width="11" height="11"/></element>
 
-		<element ref="led" name="LED41"><bounds x="1284" y="266" width="11" height="11"/></element>
+		<element ref="led" name="6.1"><bounds x="1284" y="248" width="11" height="11"/></element>
 		<element ref="hp_text"><bounds x="1300" y="248" width="14" height="12"/></element>
-		<element ref="led" name="LED42"><bounds x="1284" y="284" width="11" height="11"/></element>
+		<element ref="led" name="3.2"><bounds x="1318" y="248" width="11" height="11"/></element>
 
-		<element ref="led" name="LED43"><bounds x="1318" y="230" width="11" height="11"/></element>
+		<element ref="led" name="3.3"><bounds x="1284" y="266" width="11" height="11"/></element>
 		<element ref="bp_text"><bounds x="1300" y="266" width="13" height="12"/></element>
-		<element ref="led" name="LED44"><bounds x="1318" y="248" width="11" height="11"/></element>
+		<element ref="led" name="5.3"><bounds x="1318" y="266" width="11" height="11"/></element>
 
-		<element ref="led" name="LED45"><bounds x="1318" y="266" width="11" height="11"/></element>
+		<element ref="led" name="6.3"><bounds x="1284" y="284" width="11" height="11"/></element>
 		<element ref="bs_text"><bounds x="1300" y="284" width="13" height="12"/></element>
-		<element ref="led" name="LED46"><bounds x="1318" y="284" width="11" height="11"/></element>
+		<element ref="led" name="6.0"><bounds x="1318" y="284" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW3" inputmask="0x20"><!-- FILT 2 --><bounds x="1345" y="249" width="45" height="45"/></element>
 		<element ref="filt_2_text"><bounds x="1352" y="300" width="32" height="12"/></element>
@@ -932,20 +932,20 @@ license:CC0-1.0
 		<element ref="filter_routing_text"><bounds x="1397" y="300" width="83" height="12"/></element>
 
 
-		<element ref="led" name="LED47"><bounds x="1446" y="230" width="11" height="11"/></element>
+		<element ref="led" name="5.2"><bounds x="1446" y="230" width="11" height="11"/></element>
 		<element ref="ser_4_text"><bounds x="1456" y="230" width="36" height="12"/></element>
 
-		<element ref="led" name="LED48"><bounds x="1446" y="248" width="11" height="11"/></element>
+		<element ref="led" name="6.2"><bounds x="1446" y="248" width="11" height="11"/></element>
 		<element ref="ser_6_text"><bounds x="1456" y="247" width="36" height="12"/></element>
 
-		<element ref="led" name="LED49"><bounds x="1446" y="266" width="11" height="11"/></element>
+		<element ref="led" name="5.4"><bounds x="1446" y="266" width="11" height="11"/></element>
 		<element ref="par_4_text"><bounds x="1456" y="265" width="36" height="12"/></element>
 
-		<element ref="led" name="LED50"><bounds x="1446" y="284" width="11" height="11"/></element>
+		<element ref="led" name="6.4"><bounds x="1446" y="284" width="11" height="11"/></element>
 		<element ref="split_text"><bounds x="1457" y="283" width="32" height="12"/></element>
 
-		<element ref="led" name="LED51"><bounds x="1520" y="230" width="11" height="11"/></element>
-		<element ref="led" name="LED52"><bounds x="1565" y="230" width="11" height="11"/></element>
+		<element ref="led" name="1.4"><bounds x="1520" y="230" width="11" height="11"/></element>
+		<element ref="led" name="1.2"><bounds x="1565" y="230" width="11" height="11"/></element>
 
 		<element ref="button" inputtag="ROW1" inputmask="0x10"><!-- SELECT (Filt1) --><bounds x="1503" y="249" width="45" height="45"/></element>
 		<element ref="button" inputtag="ROW1" inputmask="0x04"><!-- SELECT (Filt2) --><bounds x="1548" y="249" width="45" height="45"/></element>