diff --git a/cfg/atarixl.cfg b/cfg/atarixl.cfg
index 1968ecd8e..493381779 100644
--- a/cfg/atarixl.cfg
+++ b/cfg/atarixl.cfg
@@ -41,7 +41,7 @@ MEMORY {
     CHARGEN:       file = "", define = yes, start = $D800, size = $0400;
 
 # memory beneath the ROM
-    RAM_BELOW_ROM: file = "",               start = $DC00, size = $FFF0 - $DC00;
+    RAM_BELOW_ROM: file = "", define = yes, start = $DC00, size = $FFF0 - $DC00;
 }
 
 SEGMENTS {
diff --git a/libsrc/atari/crt0.s b/libsrc/atari/crt0.s
index db8a595e3..eb5de1f40 100644
--- a/libsrc/atari/crt0.s
+++ b/libsrc/atari/crt0.s
@@ -97,6 +97,23 @@
 
         jsr     initlib
 
+.if 0
+.if .defined(__ATARIXL__)
+        .import __heapadd
+        .import pushax
+        .import __RAM_BELOW_ROM_START__
+        .import __RAM_BELOW_ROM_SIZE__
+        .import __RAM_BELOW_ROM_LAST__
+
+        lda     #<__RAM_BELOW_ROM_LAST__
+        ldx     #>__RAM_BELOW_ROM_LAST__
+        jsr     pushax
+        lda     #<(__RAM_BELOW_ROM_SIZE__ - (__RAM_BELOW_ROM_LAST__ - __RAM_BELOW_ROM_START__))
+        ldx     #>(__RAM_BELOW_ROM_SIZE__ - (__RAM_BELOW_ROM_LAST__ - __RAM_BELOW_ROM_START__))
+        jsr     __heapadd
+.endif
+.endif
+
 ; Set left margin to 0
 
         lda     LMARGN