( Borrowed from http://wikiti.brandonw.net/ )
( Divides AC by DE and places the quotient in AC and the
  remainder in HL )
CODE /MOD
    DE POP,
    BC POP,
    chkPS,
    A B LDrr,
    B 16 LDri,
    HL 0 LDdn,





                                                      ( cont. )