Memory operations

code c@         $01fd $e0b0 $30f9 $f010 $91a5 $c001 $91a1 end-code
code c!         $01fd $9109 $9119 $91a9 $91b9 $30f9 $f008 $c001 $8300 end-code
code @          $01fd $30f9 $f018 $91a5 $91b5 $c002 $91a1 $91b1 end-code
code !          $01fd $9109 $9119 $91a9 $91b9 $30f9 $f008 $c002 $9301 $9311 end-code