Abstract: An upright target structure includes a target main body. The target main body has a first surface and a second surface opposite to each other. The first surface is configured to connect with a back plate. The target main body further has a third surface, a fourth surface, a fifth surface and a sixth surface. The third surface connects with the first surface and the second surface. The fourth surface is opposite to the third surface and connects with the first surface. The fifth surface is opposite to the third surface and connects with the second surface. The sixth surface connects with the fourth surface and the fifth surface. The sixth surface is away from the first surface as getting close to the fifth surface.

Abstract: An upright target structure includes a target main body. The target main body has a first surface and a second surface opposite to each other. The first surface is configured to connect with a back plate. The target main body further has a third surface, a fourth surface, a fifth surface and a sixth surface. The third surface connects with the first surface and the second surface. The fourth surface is opposite to the third surface and connects with the first surface. The fifth surface is opposite to the third surface and connects with the second surface. The sixth surface connects with the fourth surface and the fifth surface. The sixth surface is away from the first surface as getting close to the fifth surface.

Abstract: A motherboard for a portable notebook computer includes a circuit board, and an extension card module connected with the circuit board. The circuit board defines a cutout in one corner thereof and includes a top layer and a bottom layer. The top layer includes a first area, a second area, a third area, and a fourth area. The first area and the third area are located near one edge of the circuit board. The second area and the fourth area are located near an opposite edge of the circuit board. The first area and the second area are near the cutout. A central processing unit, a graphics processing unit (GPU), a peripheral component interconnect (PCI) card, and a memory are located on the first through fourth areas of the circuit board respectively. The extension card module selectively receives a variety of extension cards.

Abstract: A motherboard for a portable notebook computer includes a circuit board, and an extension card module connected with the circuit board. The circuit board defines a cutout in one corner thereof and includes a top layer and a bottom layer. The top layer includes a first area, a second area, a third area, and a fourth area. The first area and the third area are located near one edge of the circuit board. The second area and the fourth area are located near an opposite edge of the circuit board. The first area and the second area are near the cutout. A central processing unit, a graphics processing unit (GPU), a peripheral component interconnect (PCI) card, and a memory are located on the first through fourth areas of the circuit board respectively. The extension card module selectively receives a variety of extension cards.