Schematic-driven layout starts with the process of schematic capture. Device numbers are used to identify the functions of devices shown on a schematic diagram. In 1987, Protel launched the circuit diagram editor Protel Schematic for DOS. Many automotive and motorcycle repair manuals devote a significant number of pages to schematic diagrams. Figure 9 shows the circuit schematic of this inverter. QUCS has a graphical interface for schematic capture. It features an integrated environment for schematic capture and PCB layout design. Men's sexual schema can be described along a spectrum from being schematic to aschematic. Figure 5 shows the circuit schematic for a three-phase VSI. It is usually automatically generated from a circuit schematic. A cutaway schematic of a simple distillation operation is shown at left. Historians claim to have found a rough schematic showing a Nazi nuclear bomb. The following is a graphical schematic of how the weekend shifting works. An entire mixed signal analysis can be driven from one integrated schematic. The calendar components are several calendar properties which create a calendar schematic (design).