A built-in serial port is next to impossible to find any more, and not really needed since you can buy a USB serial adapter for about $10. I picked up a refurbished HP 6910P from Newegg about 6 months ago, works well enough for what I do with it, which is mostly maintaining older 3300's and the associated accessories. I'm even able to run IMAT and use Folio Viewer to pull up my old documentation CD's in XP Mode on it.