diff --git a/src/emu/screen.h b/src/emu/screen.h
index a68893b8ba2..32702e26938 100644
--- a/src/emu/screen.h
+++ b/src/emu/screen.h
@@ -229,6 +229,7 @@ public:
 	void set_vblank_time(attoseconds_t time) { m_vblank = time; m_oldstyle_vblank_supplied = true; }
 	void set_size(u16 width, u16 height) { m_width = width; m_height = height; }
 	void set_visarea(s16 minx, s16 maxx, s16 miny, s16 maxy) { m_visarea.set(minx, maxx, miny, maxy); }
+	void set_visarea_full() { m_visarea.set(0, m_width - 1, 0, m_height - 1); } // call after set_size
 	void set_default_position(double xscale, double xoffs, double yscale, double yoffs) {
 		m_xscale = xscale;
 		m_xoffset = xoffs;
diff --git a/src/mame/drivers/hh_tms1k.cpp b/src/mame/drivers/hh_tms1k.cpp
index 1bd835b36bd..6a24ae76eb3 100644
--- a/src/mame/drivers/hh_tms1k.cpp
+++ b/src/mame/drivers/hh_tms1k.cpp
@@ -3843,7 +3843,7 @@ void einvader_state::einvader(machine_config &config)
 	screen.set_svg_region("svg");
 	screen.set_refresh_hz(50);
 	screen.set_size(939, 1080);
-	screen.set_visarea(0, 939-1, 0, 1080-1);
+	screen.set_visarea_full();
 	TIMER(config, "display_decay").configure_periodic(FUNC(hh_tms1k_state::display_decay_tick), attotime::from_msec(1));
 	config.set_default_layout(layout_einvader);
 
@@ -4940,7 +4940,7 @@ void ginv1000_state::ginv1000(machine_config &config)
 	screen.set_svg_region("svg");
 	screen.set_refresh_hz(50);
 	screen.set_size(226, 1080);
-	screen.set_visarea(0, 226-1, 0, 1080-1);
+	screen.set_visarea_full();
 	TIMER(config, "display_decay").configure_periodic(FUNC(hh_tms1k_state::display_decay_tick), attotime::from_msec(1));
 
 	/* sound hardware */
@@ -5091,7 +5091,7 @@ void ginv2000_state::ginv2000(machine_config &config)
 	screen.set_svg_region("svg");
 	screen.set_refresh_hz(50);
 	screen.set_size(364, 1080);
-	screen.set_visarea(0, 364-1, 0, 1080-1);
+	screen.set_visarea_full();
 	TIMER(config, "display_decay").configure_periodic(FUNC(hh_tms1k_state::display_decay_tick), attotime::from_msec(1));
 
 	/* sound hardware */
diff --git a/src/mame/drivers/novag_diablo.cpp b/src/mame/drivers/novag_diablo.cpp
index de7300eb47b..9b9086401f5 100644
--- a/src/mame/drivers/novag_diablo.cpp
+++ b/src/mame/drivers/novag_diablo.cpp
@@ -234,7 +234,7 @@ void diablo_state::diablo68k(machine_config &config)
 	m_screen->set_refresh_hz(60); // arbitrary
 	m_screen->set_vblank_time(ATTOSECONDS_IN_USEC(2500));
 	m_screen->set_size(6*16+1, 10);
-	m_screen->set_visarea(0, 6*16, 0, 10-1);
+	m_screen->set_visarea_full();
 	m_screen->set_screen_update("hd44780", FUNC(hd44780_device::screen_update));
 	m_screen->set_palette("palette");
 
diff --git a/src/mame/drivers/novag_sexpert.cpp b/src/mame/drivers/novag_sexpert.cpp
index 1083e4f0440..7980386c952 100644
--- a/src/mame/drivers/novag_sexpert.cpp
+++ b/src/mame/drivers/novag_sexpert.cpp
@@ -336,7 +336,7 @@ void sexpert_state::sexpert(machine_config &config)
 	m_screen->set_refresh_hz(60); // arbitrary
 	m_screen->set_vblank_time(ATTOSECONDS_IN_USEC(2500));
 	m_screen->set_size(6*16+1, 10);
-	m_screen->set_visarea(0, 6*16, 0, 10-1);
+	m_screen->set_visarea_full();
 	m_screen->set_screen_update("hd44780", FUNC(hd44780_device::screen_update));
 	m_screen->set_palette("palette");
 
diff --git a/src/mame/drivers/ti74.cpp b/src/mame/drivers/ti74.cpp
index a1ea72509dc..ba84d7fd57d 100644
--- a/src/mame/drivers/ti74.cpp
+++ b/src/mame/drivers/ti74.cpp
@@ -534,7 +534,7 @@ MACHINE_CONFIG_START(ti74_state::ti74)
 	screen.set_refresh_hz(60); // arbitrary
 	screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500));
 	screen.set_size(6*31+1, 9*1+1+1);
-	screen.set_visarea(0, 6*31, 0, 9*1+1);
+	screen.set_visarea_full();
 	screen.set_screen_update("hd44780", FUNC(hd44780_device::screen_update));
 	screen.set_palette("palette");
 
@@ -570,7 +570,7 @@ MACHINE_CONFIG_START(ti74_state::ti95)
 	screen.set_refresh_hz(60); // arbitrary
 	screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500));
 	screen.set_size(200, 20);
-	screen.set_visarea(0, 200-1, 0, 20-1);
+	screen.set_visarea_full();
 	screen.set_screen_update("hd44780", FUNC(hd44780_device::screen_update));
 	screen.set_palette("palette");