We are switching our lab over to a Biopac MP 150 system for Windows. As part of this switch we are buying a new desktop computer to run Media Lab and Direct RT. We are going to have Media Lab send TTL pulses to the Biopac system to mark data collection segments. I would appreciate any advice concerning what I need in a desk top computer and operating system to make this run smoothly. Not too long ago we wasted about $3500 on a Dell desk top that we never could get to send TTL signal properly in order to interface with a Coulbourn system! Thank you.