Set selector 0000H base to 0xf0000 until the first 64K are
unprotected.

diff --git a/include/miscemu.h b/include/miscemu.h
index 96dbfd8..07e25ec 100644
--- a/include/miscemu.h
+++ b/include/miscemu.h
@@ -122,6 +122,7 @@
 
 #include "poppack.h"
 
+extern WORD DOSMEM_0000H;
 extern WORD DOSMEM_BiosDataSeg;
 extern WORD DOSMEM_BiosSysSeg;
 extern BIOSDATA * DOSMEM_BiosData();