(* flags bit masks *)

  fcarry     = $0001;
  fparity    = $0004;
  fauxiliary = $0010;
  fzero      = $0040;
  fsign      = $0080;
  foverflow  = $0800;

  (* file mode magic numbers *)

  fmclosed = $d7b0;
  fminput  = $d7b1;
  fmoutput = $d7b2;
  fminout  = $d7b3;

  (* file attribute constants *)

  readonly  = $01;
  hidden    = $02;
  sysfile   = $04;
  volumeid  = $08;
  directory = $10;
  archive   = $20;
  anyfile   = $3f;

  _keep_mode  = -1;        { do not change file mode in fopen }
  _readonly   = $00;       {     share mode dos 3++ and above }
  _denyall    = $10;
  _writeonly  = $01;
  _denywrite  = $20;
  _readwrite  = $02;
  _denyread   = $30;
  _denynone   = $40;

  lockregion   = 00;
  unlockregion = 01;