However, upper back pain is most often due to muscle irritation or joint problems and is usually not a cause for concern. Upper back pain occurring with other symptoms, such as chest pain or difficulty breathing, may be a sign of a heart attack and should be immediately evaluated in an emergency setting.
(Small Computer System Interface) Pronounced scuzzy, SCSI is a hardware interface for up to 15 peripherals connected to one PCI or PCI Express card (SCSI host adapter) on the motherboard. Introduced in 1986 by Shugart Associates (see SASI), this original parallel architecture was largely replaced by a serial version (see serial attached SCSI).
OSI Open Sytem Interconnection (ISO defined communications architecture used in data link to permit heterogeneous data communication systems to be interconnected in order to allow the reliable exchange of messages without regard to the implementation of the networks and physical media through which the messages pass).