CODE !
    HL POPqq,
    DE POPqq,
    chkPS,
    (HL) E LDrr,
    HL INCss,
    (HL) D LDrr,
;CODE
CODE @
    HL POPqq,
    chkPS,
    E (HL) LDrr,
    HL INCss,
    D (HL) LDrr,
    DE PUSHqq,
;CODE