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1.0
INTRODUCTION
The ACB-5500 disk controller provides an intelligent interface
from an ANSI X3T9.2 SCSI host interface to four ST506 compatible
disk drives.
1.1
SCOPE
This manual contains all of the information necessary to quickly
install and operate the ACB-5500 with an SCSI compatible Host
Adapter and up to four ST506 disk drives.
1.2
REFERENCE DOCUMENTS
o
ANSI X3T9.2 Small Computer System Interface Specification
1.3
ACB-5500 FEATURES
o
The ACB-5500 supports four ST506 hard- and soft-sectored
drives.
o
The ACB-5500 supports a fully arbitrating SCSI system with up
to seven other controllers or hosts sharing the SCSI bus.
o
The ACB-5500 provides maximum SCSI bus throughput by
supporting bus disconnection and reconnection for explicit
and implied seeks.
o
The ACB-5500 offers complete device independence by auto
configuring to any size formatted drive.
By storing drive
parameters on the drive at format time, the need for host
initialization of the controller for various drive types is
eliminated.
o
The ACB-5500 may handle defects on a sector level by allowing
the host to request
that spare sectors be reserved on a
cylinder basis.
This provides formatted disks with constant
data capacity and allows cylinder
level
formatting.
o
The ACB-5500, utilizing a 2K dual-ported buffer, eliminates
the need for sector interleaving.
This allows the host to
read a track of data in a single revolution.
o
The ACB-5500 allows the host to reserve an entire logical
unit, or particular extents on a logical unit, limiting or
prohibiting data access by other hosts on the SCSI bus.
500504-00
1-1
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