Tablet PC. HP continues its success in the mobile hardware space with the HP Compaq Tablet PC tc4200. The tc4200 is a full-sized notebook complete with keyboard. It also has a pen and a touch-sensitive screen that rotates 180 degrees and folds down for table-style operation. The tc4200 uses an Intel Pentium M processor, supports as much as 2GB of RAM, and includes a Type I/II PC Card slot for expandability. Its dimensions are 11.22" × 9.25" × 1.35" inches with a 12.1" display, and it weighs 4.6 pounds. The tc4200 also has an ambient light sensor that automatically adjusts the brightness of the display according to the lighting conditions of your work environment—a great feature if you use your Tablet PC both indoors and outdoors.