diff --git a/include/cbm510.h b/include/cbm510.h
index 295d6e679..8a4286ee2 100644
--- a/include/cbm510.h
+++ b/include/cbm510.h
@@ -82,7 +82,9 @@
 
 
 
-/* Special routines to write bytes and words in the system bank */
+/* Special routines to read/write bytes and words in the system bank */
+unsigned char __fastcall__ peekbsys (unsigned addr);
+unsigned __fastcall__ peekwsys (unsigned addr);
 void __fastcall__ pokebsys (unsigned addr, unsigned char val);
 void __fastcall__ pokewsys (unsigned addr, unsigned val);
 
diff --git a/include/cbm610.h b/include/cbm610.h
index 2ca6f7af8..865d1452f 100644
--- a/include/cbm610.h
+++ b/include/cbm610.h
@@ -69,6 +69,8 @@
 
 
 /* Special routines to write bytes and words in the system bank */
+unsigned char __fastcall__ peekbsys (unsigned addr);
+unsigned __fastcall__ peekwsys (unsigned addr);
 void __fastcall__ pokebsys (unsigned addr, unsigned char val);
 void __fastcall__ pokewsys (unsigned addr, unsigned val);