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RAM
Random Access Memory. Memory of which any byte can be
accessed directly in a single memory cycle. Information can be
read from and written to the memory.
Scatter/Gather
A device driver feature that allows the host adapter to modify the
transfer data pointer so that a single host adapter transfer can
transfer to many segments of memory in a single transfer, mini-
mizing interrupts and overhead.
SCB
SCSI Control Block. The mechanism used in emulation mode to
transfer control information to and from the board. This is equiva-
lent to the mailbox in/out system used in standard mode.
SCSI
Small Computer System Interface.
SCSI ASC
SCSI Additional Sense Code. Byte 12 of the extended sense infor-
mation. Provides a standardized description of the condition
described by the sense information.
SCSI Device
A device attached to a Small Computer System Interface bus
cable. The device may be an initiator, a target, or capable of both
types of operation. The device may be a peripheral device, a host
device, or a device mixing both roles.
Single-Ended
A term referring to the electrical characteristics of the signals
used on the SCSI bus interface. Single-ended signals occupy a sin-
gle conductor and are references to a common ground carried on
the cable between the SCSI components attached.
Single-Threaded Operation
Operation of the computing system such that only one program
can be operating or active at a time. The computing system must
wait until all resources are available before starting an operation
and cannot start another operation until the first one is com-
pleted. No overlapping of latencies or program operation occurs.
EISA-to-Fast SCSI Host Adapter Glossary
GL-7