pc | 10.25 pc 11.25 pc | 38 |
34.5 pc
A program that organizes the internal activities of the computer and its peripheral devices. An operating system performs basic tasks such as moving data to and from devices, and managing information in memory. It also provides the user interface.
| Operation | A term, defined in |
| composed of one or more, possibly concurrent, exchanges. |
| Ordered Set | A FC term referring to four |
| special characters) that provide low level link functions, such as frame |
| demarcation and signaling between two ends of a link. It provides for |
| initialization of the link after |
| actions. |
| Originator | A FC term referring to the initiating device. |
| Parity Checking | A way to verify the accuracy of data transmitted over the SCSI bus. One |
| bit in the transfer is used to make the sum of all the 1 bits either odd or |
| even (for odd or even parity). If the sum is not correct, an error message |
| appears. |
| PCI | Peripheral Component Interconnect. A local bus specification that allows |
pc | connection of peripherals directly to computer memory. It bypasses the |
| |
| slower ISA and EISA buses. |
| PDB | Packet Descriptor Block. |
| PIO | Programmed Input/Output. A way the CPU can transfer data to and from |
| memory using the computer’s I/O ports. PIO is usually faster than DMA, |
| but requires CPU time. |
| Port | The hardware entity within a node that performs data communications |
| over the FC link. |
| Port Address | Also Port Number. The address through which commands are sent to a |
| host adapter board. This address is assigned by the PCI bus. |
| Port Number | See Port Address. |
| RAM | Random Access Memory. The computer’s primary working memory in |
| which program instructions and data are stored and are accessible to the |
| CPU. Information can be written to and read from RAM. The contents of |
| RAM are lost when the computer is turned off. |
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