The ornamental design for a keyboard for portableterminal, as shown and described.
FIG. 1 is a front perspective view of a keyboard for portable terminal showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is another side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is another side view thereof, showing the keyboard for portable terminal in another configuration.
The broken lines illustrating portions of the keyboard for portable terminal are for environmental purposes only and form no part of the claimed design.