There are also facilities for output device independence. To provide for a linear transfer characteristic from input to output device. A display device is the most common form of output device. The resulting coordinates are the device coordinates of the output device. Control devices are always shown between L1 and the output device. This allows a wired glove to also be used as an output device. The LVDA was the input/output device for the LVDC. It is a input device and also an output device. It consists of a register computer, an automated output device and an access reader. The command sends the specified lines to the standard output device. However, drawing output is not sent directly to the output device. Mix used additive writes to the output device, analogous to overdubbing on tape. A computer card punch is a computer output device that punches holes in cards. It could add, multiply, subtract, and divide, and its output device was a paper tape. TVDI also included environment information (state, or context), current color, line thickness, output device, etc.