The "A" cable is used with SCSI-1, SCSI-2, or SCSI-3 to provide "FAST"
SCSI with an 8 bit [Parallel] data bus. Refer here for the main SCSI Bus page.
With SCSI-2 the "A" may be used
alone or with the "B" cable to provide "WIDE" SCSI allowing a 16 or 32
bit data bus. The pin-out for the 'A' cable is listed on the SCSI Bus 'A' connector page.
The "B" Single-Ended cable pinout is listed on the SCSI Bus 'B' connector page.
On SCSI-3, the "A" cable may
be used for an 8 bit data bus. However the new "P" cable [shown above] is
used to provide a 16 bit data path (wide SCSI). To allow 32 bits of data
the "P" cable is combined with another new cable called "Q" (wide SCSI).
The "Q" cable pin-out is listed on the SCSI Bus 'Q'
Single-Ended connector or SCSI Bus 'Q'
Differential connector page.
Back to the main SCSI Interface Bus page
The SCSI [parallel] bus width is either 8 bits or 16 bits [Wide bus].
Also the bus may be either Single ended or Differential; however the two
are mutually exclusive SCSI is a chained parallel bus, cables start at
the Host and run from device to device in a chain. SCSI may be used for
asynchronous and synchronous transfers; Asynchronous transfers using
Start and Stop bits and synchronous transfers using system timing
(Hand-Shaking). The data bus also carries one parity bit.
Engineering Design Key words: SCSI Physical Interface,Small Computer Systems Interface, SCSI Pinouts, SCSI Description, Signal Pinout, Differential Pinout, Pin Out, P Connector, Pin out, Signal Names, row, Peripheral Computer Data Bus, Parallel Hard Drive data bus, Description, Parallel SCSI, Direct Attached Storage [DAS], Networked Attached Storage [NAS], Storage Area Network [SAN]
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