Abstract: A universal serial bus (USB) hub supporting multiple hosts and an automobile head unit using the same are provided. A USB hub circuit is set in the USB hub, which is coupled to external connectors through a bus matrix. Herein, an upstream port connector of the USB hub is coupled to the automobile head unit. When one device is coupled to a downstream port requests to serve as a host, the bus matrix couples the downstream port, coupled to the requesting device, to an upstream port of the USB hub circuit, and couples the downstream port to the automobile head unit to make the automobile head unit serve as the device.

Abstract: A universal serial bus (USB) hub supporting multiple hosts and an automobile head unit using the same are provided. A USB hub circuit is set in the USB hub, which is coupled to external connectors through a bus matrix. Herein, an upstream port connector of the USB hub is coupled to the automobile head unit. When one device is coupled to a downstream port requests to serve as a host, the bus matrix couples the downstream port, coupled to the requesting device, to an upstream port of the USB hub circuit, and couples the downstream port to the automobile head unit to make the automobile head unit serve as the device.

Abstract: A computer system unaffected by memory module instability. The computer system writes data to a plurality of memory modules. If non-recoverable errors occur in one memory module or the number of errors in one memory module reaches a preset value, the computer system reads data from another memory module. Also, a method of controlling the memory modules is disclosed.

Abstract: A computer system unaffected by memory module instability. The computer system writes data to a plurality of memory modules. If non-recoverable errors occur in one memory module or the number of errors in one memory module reaches a preset value, the computer system reads data from another memory module. Also, a method of controlling the memory modules is disclosed.

Abstract: The present invention relates to a hands free microphone and earphone comprising an ear-hook device and an earpiece. One end of the ear-hook device is provided with a ball-like protruded section, and the circumferential edge thereof has a recessed T-shaped slot, and the circumferential edge of the earpiece is appropriately provided with a mounting section with a protruded peg mounted at the inner wall such that the protruded peg can slide within the T-shaped slot. Thus, when the protruded section and the mounting section are formed integrally as one unit, the earpiece can be rotated or swing in an indefinite angle. Due to the restriction of the protruded peg, the signal wire will not be broken because of excessive winding. Thus in application, the user can be comfortably used the earpiece and an excellent reception quality is obtained.