The ornamental design for a portablecomputer, as shown and described.
FIG. 1 is a front top right side perspective view of a portable computer
with the keyboard cover and display panel pivoted to an opened position
showing our new design;
FIG. 2 is a rear, bottom and left side perspective view thereof;
FIG. 3 is a front, top and right side perspective view thereof with the
cover and display panel in closed position; and
FIG. 4 is an enlarged right side elevational view thereof.