program ustat;
type stpb = record
             intrlv,
             skew,
             StartTrack,
             StepRate,
             spt,
             tps,
             SectorSize : integer;
             TimeOut : longint;
             Diskette,             {true if diskette in drive}
             OneSided,             {true if 1 side only}
             SnglDensity,          {true if single density}
             UserSPT : boolean;    {true if user set spt}
           end;

var a: char;
    un,fc,i,ior: integer;
    l: longint;
    spb: stpb;

  procedure Ucase(var a: char);
  begin
  if (a>='a') and (a<='z') then a := chr(ord(a) - $20);
  end;

begin
write('Enter unit number: '); readln(un);
repeat
   write('Enter function code: '); readln(fc);
   write('Select parameter type : [ L)ong, I)nteger, S)tatus ] ');
   read(a); writeln; Ucase(a);
   case a of
      'L': begin
           write('Enter parameter: '); readln(l);
           unitstatus(un,l,fc);
           ior := ioresult;
           end;
      'I': begin
           write('Enter parameter: '); readln(i);
           unitstatus(un,i,fc);
           ior := ioresult;
           end;
      'S': begin
           unitstatus(un,spb,fc);
           ior := ioresult;
           end;
      end;
   writeln('IOresult = ',ior:1);
   write('Done? '); readln(a); Ucase(a);
   until (a='Y');
end.