diff --git a/src/ld65/cfg/cbm510.cfg b/src/ld65/cfg/cbm510.cfg
index 586412d53..499502776 100644
--- a/src/ld65/cfg/cbm510.cfg
+++ b/src/ld65/cfg/cbm510.cfg
@@ -1,6 +1,7 @@
 MEMORY {
     ZP: start = $02, size = $1A, type = rw;
-    RAM: start = $0001, size = $FFF0, file = %O;
+    RAM: start = $0001, size = $F3FF, file = %O;
+    VIDRAM: start = $F400, size = $0400, define = yes, file = "";
 }
 SEGMENTS {
     CODE: load = RAM, type = wprot;
@@ -20,5 +21,5 @@ FEATURES {
 	    count = __DESTRUCTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__ = $781;      	# ~2K stack
 }