[BC] any DOS fanatics out there?

[SteveOrdinetz]

  DANA PUOPOLO wrote:
>DOS 4.0 was probably the worst DOS made.
>DOS 5 was the best.


I'd read long ago that 4.0 was pretty bad, 5 not much better.  I think I 
had a machine once with 4.0 in it...don't recall any problems with 
it.  What was the problem with those versions of DOS?