The ornamental design for a computerterminal, as shown and described.
FIG. 1 is a front left side perspective view showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a left side elevation view thereof; the right side being a mirror image; and,
FIG. 4 is a top plan view thereof.
No claim is made to the configuration and shape of the keyboard and functional keys which are for illustrative purposes only and form no part of the claimed design.