(); if (i==j) Push(1); else Push(0);
LSS       Compare if less     j=Pop(); i=Pop(); if (i&lt;j) Push(1); else Push(0);
GTR       Compare if greater  j=Pop(); i=Pop(); if (i&gt;j) Push(1); else Push(0);
CALL l,a  Call procedure      slink=Frame(l); Push(slink); Push(base); Push(pc+2);
                              pc=a; base=top-3;
RET       Return from proc.   top=base+3; pc=Pop(); base=Pop(); dummy=Pop();
RES i     Reserve frame space top=top+i;
JMP a     Jump                pc=a;
FJMP a    False jump    