EISA Fast SCSI Caching Adapter
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 |
