diff --git a/src/emu/video/mc6845.c b/src/emu/video/mc6845.c
index 7b9f0b1fc1f..60f98535aa0 100644
--- a/src/emu/video/mc6845.c
+++ b/src/emu/video/mc6845.c
@@ -92,6 +92,7 @@ mc6845_device::mc6845_device(const machine_config &mconfig, device_type type, co
 	: device_t(mconfig, type, name, tag, owner, clock, shortname, source),
 		device_video_interface(mconfig, *this, false),
 		m_show_border_area(true),
+		m_interlace_adjust(0),
 		m_visarea_adjust_min_x(0),
 		m_visarea_adjust_max_x(0),
 		m_visarea_adjust_min_y(0),
@@ -108,6 +109,7 @@ mc6845_device::mc6845_device(const machine_config &mconfig, const char *tag, dev
 	: device_t(mconfig, MC6845, "MC6845 CRTC", tag, owner, clock, "mc6845", __FILE__),
 		device_video_interface(mconfig, *this, false),
 		m_show_border_area(true),
+		m_interlace_adjust(0),
 		m_visarea_adjust_min_x(0),
 		m_visarea_adjust_max_x(0),
 		m_visarea_adjust_min_y(0),
@@ -218,7 +220,7 @@ WRITE8_MEMBER( mc6845_device::register_w )
 		case 0x06:  m_vert_disp        =   data & 0x7f; break;
 		case 0x07:  m_vert_sync_pos    =   data & 0x7f; break;
 		case 0x08:  m_mode_control     =   data & 0xff; break;
-		case 0x09:  m_max_ras_addr     =   data & 0x1f; break;
+		case 0x09:  m_max_ras_addr     =   data & 0x1f; if (MODE_INTERLACE_AND_VIDEO) m_max_ras_addr += m_interlace_adjust; break;
 		case 0x0a:  m_cursor_start_ras =   data & 0x7f; break;
 		case 0x0b:  m_cursor_end_ras   =   data & 0x1f; break;
 		case 0x0c:  m_disp_start_addr  = ((data & 0x3f) << 8) | (m_disp_start_addr & 0x00ff); break;
@@ -454,10 +456,6 @@ void mc6845_device::recompute_parameters(bool postload)
 {
 	UINT16 hsync_on_pos, hsync_off_pos, vsync_on_pos, vsync_off_pos;
 
-	// needed for the apricot, correct?
-	if (MODE_INTERLACE_AND_VIDEO)
-		m_max_ras_addr |= 1;
-
 	UINT16 video_char_height = m_max_ras_addr + 1;   // fix garbage at the bottom of the screen (eg victor9k)
 	// Would be useful for 'interlace and video' mode support...
 	// UINT16 frame_char_height = (MODE_INTERLACE_AND_VIDEO ? m_max_ras_addr / 2 : m_max_ras_addr) + 1;
diff --git a/src/emu/video/mc6845.h b/src/emu/video/mc6845.h
index db7e80f84a5..053c2b9491e 100644
--- a/src/emu/video/mc6845.h
+++ b/src/emu/video/mc6845.h
@@ -30,6 +30,9 @@
 #define MCFG_MC6845_SHOW_BORDER_AREA(_show) \
 	mc6845_device::set_show_border_area(*device, _show);
 
+#define MCFG_MC6845_INTERLACE_ADJUST(_value) \
+	mc6845_device::set_interlace_adjust(*device, _value);
+
 #define MCFG_MC6845_VISAREA_ADJUST(_minx, _maxx, _miny, _maxy) \
 	mc6845_device::set_visarea_adjust(*device, _minx, _maxx, _miny, _maxy);
 
@@ -96,6 +99,7 @@ public:
 	mc6845_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source);
 
 	static void set_show_border_area(device_t &device, bool show) { downcast<mc6845_device &>(device).m_show_border_area = show; }
+	static void set_interlace_adjust(device_t &device, int value) { downcast<mc6845_device &>(device).m_interlace_adjust = value; }
 	static void set_visarea_adjust(device_t &device, int min_x, int max_x, int min_y, int max_y)
 	{
 		mc6845_device &dev = downcast<mc6845_device &>(device);
@@ -272,6 +276,7 @@ protected:
 	 ************************/
 
 	bool m_show_border_area;        /* visible screen area (false) active display (true) active display + blanking */
+	int m_interlace_adjust; /* adjust max ras in interlace mode */
 
 	/* visible screen area adjustment */
 	int m_visarea_adjust_min_x;
diff --git a/src/mess/drivers/apricot.c b/src/mess/drivers/apricot.c
index 15f5f1d5982..0f11ca0d635 100644
--- a/src/mess/drivers/apricot.c
+++ b/src/mess/drivers/apricot.c
@@ -401,6 +401,7 @@ static MACHINE_CONFIG_START( apricot, apricot_state )
 	MCFG_PALETTE_ADD_MONOCHROME_GREEN_HIGHLIGHT("palette")
 
 	MCFG_MC6845_ADD("ic30", MC6845, "screen", XTAL_15MHz / 10)
+	MCFG_MC6845_INTERLACE_ADJUST(1)
 	MCFG_MC6845_SHOW_BORDER_AREA(false)
 	MCFG_MC6845_CHAR_WIDTH(10)
 	MCFG_MC6845_UPDATE_ROW_CB(apricot_state, crtc_update_row)