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EISA Fast SCSI Caching Adapter
6
Chapter 0
Introduction
The DC-820B is an intelligent multi-tasking SCSI (Small Computer System
Interface) bus to EISA bus host adapter. Up to six DC-820B adapters can
be installed in one system with each adapter supporting up to seven SCSI
devices. In addition, the DC-820B offers hardware-based disk mirroring
under all operating systems in order to further safeguard your valuable data.
Another feature, the Disconnect/Reconnect, minimizes the performance down-
grade during multi-tasking operations.
The DC-820B effectively reduces disk access times by way of its on-board
co-processor which handles most of the disk access chores to relieve the
burden of the mainboard’s CPU. Through its multi-tasking support, the DC-
820B manages the SCSI sub-system efficiently and smoothly. The on-board
cache facilitates increased DTR (Data Transfer Rate) and markedly reduces
direct read/write accesses to the storage subsystem, thus prolonging the
lifetime of your drives. This feature applies to fixed disks or removable
media devices, such as removable cartridge, MO (Magneto-Optical) and
Floptical drives.
The DC-820B is both I/O register and command compatible with the AHA
1540/1542 series, and able to run with built-in Adaptec drivers. The follow-
ing are the operating systems that allow you to do so:
n MS-DOS (through BIOS INT 13H) n Windows 3.X/NT
n OS/2 1.31/2.X n SCO UNIX V3.2.X
n SCO ODT V1.X/2.0 n SCO XENIX V2.3.X
n ISC UNIX V3.2 n AT&T UNIX SVR4.X
n USL UNIX SVR 4.2 n Sunsoft NextStep V3.1
n Solaris OS V2.1 n QNX V2.15
n PICK 5.2.4 n Banyan VINES(R) 5.00