This invention provides a bottomhole assembly that contains a thruster for applying an axial force on the drill bit during drilling of the wellbore. In one example, a context ID is assigned to graphics applications including a unique context memory buffer, a unique indirect context pointer and a corresponding size to each context ID, an indirect context offset, and an indirect context buffer address range. A controller for controlling the tilt actuator and recline actuator is also provided. The voltage output module sums two output currents of the positive temperature coefficient current generating module and the negative temperature coefficient current generating module and transforms the total current into output voltage that is stable under temperature and process variation. Without an output order change circuit, it is possible to perform the color correction and output image data of the color constituents according to an output device, resulting in a compact apparatus. The direct-coupled emissive array is fabricated on an optically coupled substrate that provides light-directing elements, such as a lenslet array or fiber optic faceplate for directing light from emitter pixels to print pixel locations on the photosensitive medium.