The ornamental design for a portablecomputer, as shown and described.
All of the material from the parent application which is essential to the claimed design is included herein. Any material in parent application which is not present here forms no part of the claimed design.
FIG. 1 is a perspective view taken from the top and right side of a portable computer showing the new design; and,
FIG. 2 is a fragmented top plan view thereof.
The broken lines are shown for illustrative purposes only and form no part of the claimed design.