burnintest version difference

[elic]

what is the difference between BIT4.0 and BIT5.3?
We running the COM port loopback test and randomicity getting the "Error while sending data to COM port" message.but runing BIT4.0 is no the issue.
WinXP SP2, Intel N270+ICH7M

[David (PassMark)]

You can find a complete list of changes made in each release here,
http://www.passmark.com/products/bit_history.htm