The ThinkPad was one of IBM's most successful computers. This model features a Pentium MMX 166/66 processor and I've bumped its memory to the maximum 84 megs and added a 40 gig hard drive to replace the factory installed 2.1 gig. It is a very well-built and sturdy laptop, although it is not very powerful. It belonged to Diane Cigich, my father's main squeeze, who donated it to me when she got a newer computer.