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flow of data to and from system
memory by blocks, as opposed to
PIO (Programmed I/O) where the
flow is byte by byte.
device driver A program that
allows a microprocessor (through
the operating system) to direct the
operation of a peripheral device.
differential A hardware
configuration for connecting SCSI
devices. It uses a pair of lines for
each signal transfer (as opposed to
single-ended SCSI which
references each SCSI signal to a
common ground).
EEPROM (electronically
erasable programmable
read-only memory) A memory
chip typically used to store
configuration information. See
NVRAM.
EISA (Extended Industry
Standard Architecture) An
extension of the 16-bit ISA bus
standard. It allows devices to
perform 32-bit data transfers.
external SCSI device A SCSI
device installed outside the
computer cabinet. External SCSI
devices are connected in a chain
using shielded cables.
Fast SCSI A standard for SCSI
data transfers. It allows a transfer
rate of up to 10 MBytes/sec over an
8-bit SCSI bus, and up to 20
MBytes/sec over a 16-bit SCSI bus.
FCC Federal Communications
Commission.
file A named collection of
information, usually stored on a
disk.
firmware Software that is
permanently stored in ROM. In
the case of BIOS, it can be accessed
during boot time without the aid of
an operating or file system.
hard disk A rigid disk
permanently sealed into a drive
cartridge. A hard disk can store
very large amounts of information.
host The computer system in
which a SCSI host adapter is
installed. It uses the SCSI host
adapter to transfer information to
and from devices attached to the
SCSI bus.
host bus adapter (HBA) A
circuit board and/or integrated
circuit device that provides a SCSI
bus connection to the computer
system.
internal SCSI device A SCSI
device installed inside the
computer cabinet. These devices
are connected in a chain using an
unshielded ribbon cable.
IRQ (interrupt request
channel) A path through which a
device can get the immediate
attention of the computer’s CPU.
The PCI bus assigns an IRQ path