+RVS = $F3 ; Reverse output flag
+SCROLL = $F8 ; Disable scrolling flag
+FETCH = $2A2 ; Fetch subroutine in RAM
+FETVEC = $2AA ; Vector patch location for FETCH
+STASH = $2AF ; Stash routine in RAM
+STAVEC = $2B9 ; Vector patch location for STASH
+PALFLAG = $A03 ; $FF=PAL, $00=NTSC