Adaptec AHA-2742T User Manual - Page 109

Bus Device Reset, Bus Mastering

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AHA-2740 Series User's Manual B BIOS Basic Input/Output System. Software coded into computer chips for various purposes. The BIOS on the motherboard of a PC is the special program used to boot and control the computer. There are other kinds of BIOS, such as Host Adapter BIOS. Bus A pathway for data in a computer system. All PCs have an expansion bus, which is designed to host add-on (expansion) devices, such as modems, adapter boards and video adapters. Expansion devices use the bus to send data to and receive data from the PC's CPU or memory. ISA, EISA and Micro Channel® are the major bus standards used in PCs. Bus Device Reset A SCSI message that clears all pending activity in the SCSI peripheral device target to which it is addressed. Bus Mastering A high performance method of data transfer in which the host adapter's on-board processor handles the transfer of data directly to and from a computer's memory without intervention from the computer's microprocessor. This is the fastest method of data transfer available for multi-tasking operating systems. Adaptec's AHA-2740 Series of host adapters use bus mastering. Byte An eight-bit unit of data. A byte is normally the smallest addressable unit of memory and the smallest unit of transfer on the SCSI bus. C CCB See Command Control Block CCS See Common Command Set Glossary-4 Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page G-4) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

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B
BIOS
Basic Input/Output System. Software coded into computer chips
for various purposes. The BIOS on the motherboard of a PC is the
special program used to boot and control the computer. There are
other kinds of BIOS, such as Host Adapter BIOS.
Bus
A pathway for data in a computer system. All PCs have an expan-
sion bus, which is designed to host add-on (expansion) devices,
such as modems, adapter boards and video adapters. Expansion
devices use the bus to send data to and receive data from the PC’s
CPU or memory. ISA, EISA and Micro Channel
®
are the major
bus standards used in PCs.
Bus Device Reset
A SCSI message that clears all pending activity in the SCSI
peripheral device target to which it is addressed.
Bus Mastering
A high performance method of data transfer in which the host
adapter’s on-board processor handles the transfer of data directly
to and from a computer’s memory without intervention from the
computer’s microprocessor. This is the fastest method of data
transfer available for multi-tasking operating systems. Adaptec’s
AHA-2740 Series of host adapters use bus mastering.
Byte
An eight-bit unit of data. A byte is normally the smallest address-
able unit of memory and the smallest unit of transfer on the SCSI
bus.
C
CCB
See Command Control Block
CCS
See Common Command Set
Adaptec AHA-2740 Series User’s Manual
Stock Number:
510381-00
/
Rev. C
(Page G-4)
Print Spec Number:
491709-00 Rev C
Current Date:
9/1/93
ECN Date:
9/14/93
AHA-2740 Series User’s Manual
Glossary-4