Hi. New member w/ a problem: I have a Dell optiplex computer running a scientific instrument. It is from 1999 I believe. The mobo is identified as 0000141E. This mobo has a very long slot which accommodates a daughterboard which in turn takes a card cage plugging into it. This secondary daughterboard's card cage has slots for the circuit boards (there are four cards) which form the interface for the instrument. So, the computer failed- the hard drive developed bad sectors, I copied the application software (it runs on Windows 98) to another hard drive. I am testing the mobo but have found replacements on ebay. My question pertains to this Dell Optiplex computer & this mobo w/ this very very long slot into which my daughterboard plugs. What is the use of this very long slot ???? What else might it be for ??? Paul email@example.com Thanks so much for the help.