diff --git a/src/mame/drivers/legionna.c b/src/mame/drivers/legionna.c
index 60ef4317090..3a8bc1ccc1c 100644
--- a/src/mame/drivers/legionna.c
+++ b/src/mame/drivers/legionna.c
@@ -1228,7 +1228,7 @@ static MACHINE_CONFIG_START( cupsoc, legionna_state )
 	MCFG_SCREEN_REFRESH_RATE(60)
 	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
 	MCFG_SCREEN_SIZE(42*8, 36*8)
-	MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 32*8-1)
+	MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 30*8-1)
 	MCFG_SCREEN_UPDATE_DRIVER(legionna_state, screen_update_grainbow)
 	MCFG_SCREEN_PALETTE("palette")
 
@@ -1268,7 +1268,7 @@ static MACHINE_CONFIG_START( cupsocbl, legionna_state )
 	MCFG_SCREEN_REFRESH_RATE(60)
 	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
 	MCFG_SCREEN_SIZE(42*8, 36*8)
-	MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 32*8-1)
+	MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 30*8-1)
 	MCFG_SCREEN_UPDATE_DRIVER(legionna_state, screen_update_grainbow)
 	MCFG_SCREEN_PALETTE("palette")
 
diff --git a/src/mame/machine/seicop.c b/src/mame/machine/seicop.c
index 3cda84f5912..fecb5dc2668 100644
--- a/src/mame/machine/seicop.c
+++ b/src/mame/machine/seicop.c
@@ -2787,6 +2787,12 @@ WRITE16_MEMBER( seibu_cop_legacy_device::generic_cop_w )
 				/* 8 + [4] */
 				/* 4 + [6] */
 
+				// these two are obvious ...
+				// 0xf x 16 = 240
+				// 0x14 x 16 = 320
+				// what are these two instead? scale factor? offsets?
+				// 0xfc69 ?
+				// 0x7f4 ?
 				//printf("%08x %08x %08x %08x %08x %08x %08x\n",m_cop_register[0],m_cop_register[1],m_cop_register[2],m_cop_register[3],m_cop_register[4],m_cop_register[5],m_cop_register[6]);
 
 				offs = (offset & 3) * 4;
diff --git a/src/mame/video/seibu_crtc.c b/src/mame/video/seibu_crtc.c
index 59bdf410113..216d250fd45 100644
--- a/src/mame/video/seibu_crtc.c
+++ b/src/mame/video/seibu_crtc.c
@@ -28,8 +28,8 @@ preliminary memory map:
 (screen 1 -> Foreground)
 (screen 2 -> Midground)
 (screen 3 -> Text layer)
-[0x00]: Single cell H size +1?
-[0x02]: Total number of visible cells +1?
+[0x00]: Total number of visible cells?
+[0x02]: Single cell H size +1?
 [0x1a]: Layer Dynamic Paging?
 [0x1c]: Layer Enable
 ---x ---- sprite enable