CAMAC - 3929
SCSI Crate Controller |
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ABOUT 3929
The Model 3929 is a double-width CAMAC crate controller which communicates
with a host computer via the Small Computer Systems Interface (SCSI) bus
and complies with ANSI Specification X3.131-1986. This SCSI specification defines a
standard approach for interfacing disk drives, printers, and other devices to one or more
host computers. The SCSI bus is becoming one of the more popular peripheral channels
for personal computers and workstations.
Peripheral controllers are called targets on a SCSI channel. Up to eight target controllers
can be addressed on a single SCSI bus. In a typical personal computer or workstation,
one or more floppy disk drives form one SCSI target controller, and the hard disk
provides a second controller. This allows six additional controllers, such as the 3929, on
the SCSI bus. The SCSI controller address is selected by a thumb wheel switch on the
front panel of the3929 crate controller.
The SCSI bus, as used by the 3929, contains an eight-bit data path with parity,nine
control signals, terminator power, and associated ground return conductors. All signals
are unbalanced, and the maximum total bus length is six meters (20 feet). Third-party
bus extenders are available to provide balanced-line or fiber optic extensions to the
SCSI bus. Two connectors are provided on the front panel of the 3929 to "pass through"
the SCSI bus. On-board termination is provided on the 3929.
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