diff --git a/src/mame/layout/coco3.lay b/src/mame/layout/coco3.lay
index 24634e4ab52..0a4205d8cdd 100644
--- a/src/mame/layout/coco3.lay
+++ b/src/mame/layout/coco3.lay
@@ -6,7 +6,7 @@
 		</screen>
 
 		<!-- workaround for MAME selecting a 2-screen view by default -->
-		<screen index="1"><bounds left="0" top="0" right="1" bottom="1" /><color alpha="0" /></screen>
+		<screen index="1"><bounds left="0" top="0" right="4" bottom="3" /><color alpha="0" /></screen>
 	</view>
 
 	<view name="RGB">
diff --git a/src/mame/layout/model1io2.lay b/src/mame/layout/model1io2.lay
index 60b1d49cc97..f029cd09bf1 100644
--- a/src/mame/layout/model1io2.lay
+++ b/src/mame/layout/model1io2.lay
@@ -23,7 +23,7 @@
 		</screen>
 
 		<!-- workaround for MAME selecting a 2-screen view by default -->
-		<screen tag="ioboard:screen"><bounds left="0" top="0" right="1" bottom="1" /><color alpha="0" /></screen>
+		<screen tag="ioboard:screen"><bounds left="0" top="0" right="4" bottom="3" /><color alpha="0" /></screen>
 	</view>
 
 	<view name="Diagnostic">
diff --git a/src/mame/layout/sms1.lay b/src/mame/layout/sms1.lay
index 93a8c03a3cf..b390da57e59 100644
--- a/src/mame/layout/sms1.lay
+++ b/src/mame/layout/sms1.lay
@@ -6,8 +6,8 @@
 		</screen>
 
 		<!-- workaround for MAME selecting a 3-screen view by default -->
-		<screen index="1"><bounds left="0" top="0" right="1" bottom="1" /><color alpha="0" /></screen>
-		<screen index="2"><bounds left="0" top="0" right="1" bottom="1" /><color alpha="0" /></screen>
+		<screen index="1"><bounds left="0" top="0" right="4" bottom="3" /><color alpha="0" /></screen>
+		<screen index="2"><bounds left="0" top="0" right="4" bottom="3" /><color alpha="0" /></screen>
 	</view>
 
 	<view name="SegaScope Left LCD Standard (4:3)">