That could be a AT style case, and none of the new mother boards will work with it. Its easy to check to see if it is. A AT case has the ports like printer and mouse in the same expansion slots as the modem or vid card. A ATX (the new ones) will have the keyboard, mouse, printer, serial ports all piled next to one another at the top of the case. On a At case the keyboard plug will be all by its self. If you pull the case open its easy to tell. A ATX board is taller than it is long, and a AT is longer than it is tall. If it is square, its a bAT board, which is a small AT board.