L3 BSET PC ORG @ 0x34 + ! ( execute. DE -> wordref )
    ( We don't apply BIN( reliably on stable ABI stuff, we
      might need to adjust addr. Ugly, but well... )
    BIN( @ [IF]
        A XORr, D ORr, IFZ, D BIN( @ 256 / LDrn, THEN,
    [THEN]
    LDA(DE),
    L A LDrr,
    H BIN( @ 256 / LDrn,
    DE INCss,
    ( DE points to PFA )
    JP(HL),