diff --git a/cfg/atarixl-largehimem.cfg b/cfg/atarixl-largehimem.cfg
index d34494772..7af90e214 100644
--- a/cfg/atarixl-largehimem.cfg
+++ b/cfg/atarixl-largehimem.cfg
@@ -45,7 +45,7 @@ MEMORY {
     CHARGEN:       file = "", define = yes, start = $D800, size = $0400;
 
 # memory beneath the ROM
-    HIDDEN_RAM:    file = "", define = yes, start = $DC00, size = $FFF0 - $DC00;
+    HIDDEN_RAM:    file = "", define = yes, start = $DC00, size = $FFFA - $DC00;
 }
 
 SEGMENTS {
diff --git a/cfg/atarixl-overlay.cfg b/cfg/atarixl-overlay.cfg
index a07d8b27a..42cc5fac9 100644
--- a/cfg/atarixl-overlay.cfg
+++ b/cfg/atarixl-overlay.cfg
@@ -1,3 +1,4 @@
+B
 FEATURES {
     STARTADDRESS: default = $2400;
 }
@@ -46,7 +47,7 @@ MEMORY {
     CHARGEN:       file = "", define = yes, start = $E000, size = $0400;
 
 # memory beneath the ROM
-    HIDDEN_RAM:    file = "", define = yes, start = $E400, size = $FFF0 - $E400;
+    HIDDEN_RAM:    file = "", define = yes, start = $E400, size = $FFFA - $E400;
 
 # overlays
     OVL1:          file = "%O.1",           start = %S,                     size = __OVERLAYSIZE__;
diff --git a/cfg/atarixl.cfg b/cfg/atarixl.cfg
index 55a14a5e0..04a260059 100644
--- a/cfg/atarixl.cfg
+++ b/cfg/atarixl.cfg
@@ -43,7 +43,7 @@ MEMORY {
     CHARGEN:       file = "", define = yes, start = $E000, size = $0400;
 
 # memory beneath the ROM
-    HIDDEN_RAM:    file = "", define = yes, start = $E400, size = $FFF0 - $E400;
+    HIDDEN_RAM:    file = "", define = yes, start = $E400, size = $FFFA - $E400;
 }
 
 SEGMENTS {