diff --git a/testcode/lib/atari/mem.c b/testcode/lib/atari/mem.c
new file mode 100644
index 000000000..6de184e52
--- /dev/null
+++ b/testcode/lib/atari/mem.c
@@ -0,0 +1,19 @@
+/*
+ * test program to display avail. mem.
+ *
+ */
+
+#include <stdio.h>
+
+unsigned int *APPMHI = (unsigned int *)0xe;
+unsigned int *MEMTOP = (unsigned int *)0x2e5;
+
+unsigned char _graphmode_used = 0;
+
+int main(void)
+{
+    printf("APPMHI = %04X, MEMTOP = %04X\n",*APPMHI,*MEMTOP);
+    printf("press return!\n");
+    getchar();
+    return(0);
+}