{
 Successful status returns.  These values are also returned in the
 io_status_block.
}
    is_bv = 000005B;  is_cc = 001401B;  is_clr = 000000B; is_cr = 006401B;
    is_eot = 002001B; is_esc = 015401B; is_esq = 115401B; is_pes = 100001B;
    is_pnd = 000000B; is_rdd = 000002B; is_set = 000002B; is_spd = 000002B;
    is_suc = 000001B; is_tab = 004401B; is_tmo = 000002B; is_tnc = 000002B;


{
 Error status values returned in the io_status_block
}
    ie_2dv = 177720B; ie_abo = 177761B; ie_act = 177771B; ie_adp = 177636B;
    ie_alc = 177654B; ie_alg = 177654B; ie_aln = 177736B; ie_ast = 177660B;
    ie_bad = 177777B; ie_bbe = 177710B; ie_bcc = 177676B; ie_bdi = 177714B;
    ie_bdr = 177716B; ie_bdv = 177711B; ie_bhd = 177700B; ie_blb = 177672B;
    ie_blk = 177754B; ie_bnm = 177712B; ie_btf = 177664B; ie_btp = 177725B;
    ie_bvr = 177701B; ie_byt = 177755B; ie_ckp = 177766B; ie_cks = 177742B;
    ie_clo = 177732B; ie_cnr = 177667B; ie_con = 177752B; ie_daa = 177770B;
    ie_dao = 177763B; ie_dfu = 177750B; ie_dna = 177771B; ie_dnr = 177775B;
    ie_dun = 177767B; ie_dup = 177707B; ie_eof = 177766B; ie_eot = 177702B;
    ie_eov = 177765B; ie_exp = 177665B; ie_fex = 177717B; ie_fhe = 177705B;
    ie_fix = 177767B; ie_flg = 177647B; ie_fln = 177657B; ie_fop = 177713B;
    ie_hfu = 177744B; ie_hwr = 177772B; ie_ibs = 177647B; ie_ice = 177721B;
    ie_idu = 177644B; ie_ief = 177637B; ie_ies = 177656B; ie_ifc = 177776B;
    ie_ifu = 177747B; ie_ill = 177726B; ie_ilu = 177640B; ie_ilv = 177755B;
    ie_ins = 177776B; ie_iop = 177655B; ie_ipr = 177641B; ie_isq = 177703B;
    ie_iti = 177643B; ie_itp = 177650B; ie_its = 177770B; ie_iui = 177645B;
    ie_lck = 177745B; ie_lnl = 177646B; ie_map = 177657B; ie_mod = 177753B;
    ie_nbf = 177731B; ie_nbk = 177727B; ie_ndr = 177670B; ie_nfi = 177704B;
    ie_nfw = 177673B; ie_nlk = 177661B; ie_nln = 177733B; ie_nnc = 177663B;
    ie_nnl = 177662B; ie_nnn = 177674B; ie_nod = 177751B; ie_nsf = 177746B;
    ie_nst = 177660B; ie_nsw = 177756B; ie_ntr = 177651B; ie_nvr = 177652B;
    ie_nvw = 177651B; ie_ofl = 177677B; ie_onl = 177675B; ie_onp = 177773B;
    ie_ovr = 177756B; ie_pes = 177655B; ie_pns = 177642B; ie_pri = 177760B;
    ie_pts = 177775B; ie_rac = 177724B; ie_rat = 177723B; ie_rbg = 177730B;
    ie_rbs = 177761B; ie_rcn = 177722B; ie_rej = 177650B; ie_rer = 177740B;
    ie_rnm = 177715B; ie_rsu = 177757B; ie_sdp = 177635B; ie_snc = 177735B;
    ie_spc = 177772B; ie_sqc = 177734B; ie_sre = 177762B; ie_stk = 177706B;
    ie_tch = 177765B; ie_tmm = 177671B; ie_tmo = 177666B; ie_ulk = 177653B;
    ie_uln = 177773B; ie_uns = 177774B; ie_upn = 177777B; ie_ver = 177774B;
    ie_wac = 177743B; ie_wat = 177741B; ie_wck = 177652B; ie_wer = 177737B;
    ie_wlk = 177764B; ie_wov = 177653B;