I guess, mean that you cannot use e.g. the Up and Down arrow keys to scroll through the input line history as in the following program
//uses crt;
var
s: string;
begin
repeat
readln(s);
writeln(s);
until s='';
end.
if you enable the uses crt. Without CRT you have access to the input line history.
If this is your problem, then AFAIK it cannot be fixed because this feature is a result of the operating system handling of the files input and output. If you use CRT, input and output are handled via the Pascal RTL and you would have to implement this feature in the CRT source code.