IFZ, ( end of buffer reached? )
                ( yes )
                ( +4 == ACIA( )
                ACIA_MEM 4 + LDHL(nn),
                ( +2 == ACIAW> )
                ACIA_MEM 2+ LD(nn)HL,
            THEN,
        THEN,
    THEN,
    DE POPqq,
    HL POPqq,
    AF POPqq,
    EI,
    RETI,