diff --git a/src/emu/bus/c64/xl80.c b/src/emu/bus/c64/xl80.c
index 886368c810f..4cf88e5df70 100644
--- a/src/emu/bus/c64/xl80.c
+++ b/src/emu/bus/c64/xl80.c
@@ -126,13 +126,12 @@ static MACHINE_CONFIG_FRAGMENT( c64_xl80 )
 	MCFG_SCREEN_UPDATE_DEVICE(HD46505SP_TAG, h46505_device, screen_update)
 	MCFG_SCREEN_SIZE(80*8, 24*8)
 	MCFG_SCREEN_VISIBLE_AREA(0, 80*8-1, 0, 24*8-1)
-	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
 	MCFG_SCREEN_REFRESH_RATE(50)
 
 	MCFG_GFXDECODE_ADD("gfxdecode", "palette", c64_xl80)
 	MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")
 
-	MCFG_MC6845_ADD(HD46505SP_TAG, H46505, MC6845_SCREEN_TAG, XTAL_14_31818MHz)
+	MCFG_MC6845_ADD(HD46505SP_TAG, H46505, MC6845_SCREEN_TAG, XTAL_14_31818MHz / 8)
 	MCFG_MC6845_SHOW_BORDER_AREA(true)
 	MCFG_MC6845_CHAR_WIDTH(8)
 	MCFG_MC6845_UPDATE_ROW_CB(c64_xl80_device, crtc_update_row)
diff --git a/src/emu/video/mc6845.c b/src/emu/video/mc6845.c
index 22ff53b9eb8..a0ec77103fa 100644
--- a/src/emu/video/mc6845.c
+++ b/src/emu/video/mc6845.c
@@ -525,7 +525,7 @@ void mc6845_device::recompute_parameters(bool postload)
 			}
 
 			if(m_show_border_area)
-				visarea.set(0, horiz_pix_total+1, 0, vert_pix_total+1);
+				visarea.set(0, horiz_pix_total-1, 0, vert_pix_total-1);
 			else
 				visarea.set(0 + m_visarea_adjust_min_x, max_visible_x + m_visarea_adjust_max_x, 0 + m_visarea_adjust_min_y, max_visible_y + m_visarea_adjust_max_y);