<_description> DATAI 2 ADDB 1,2 ROTC 2,-22 XOR 1,2 JRST .-4 As reported by HAKMEM, in 1962, Jackson Wright wrote the above PDP-1 code. That code still lives on in this screenhack, some 35 years later. The number of lines of enclosing code has increased substantially, however. This version is by Tim Showalter.