BUSLOGIC INTRODUCES INDUSTRY'S FIRST INTELLIGENT PCI LOCAL BUS SCSI HOST
ADAPTER

Incorporates BusLogic's New MultiMaster Bus Mastering Architecture To
Deliver 32-Bit Bus Master Data Transfers

ATLANTA, Ga., May 26, 1993 -- BusLogic Inc., a premier supplier of high
performance Small Computer Systems Interface (SCSI) bus master host
adapters and disk array software today introduced the industry's first
Fast SCSI-2 host adapter for systems incorporating the PCI (Peripheral
Component Interconnect) local bus architecture. The PCI local bus
dramatically increases system throughput by creating a direct channel from
SCSI peripherals to the host CPU. This allows the SCSI data path to bypass
the CPU bottleneck and reduces SCSI response time.

Called the BT-946C, BusLogic's new host adapter allows 32-bit data
transfers of up to 132 megabytes (MB) per second across the PCI bus,
making it ideal for multiuser, multitasking, networked environments, as
well as I/O intensive applications such as graphics and multimedia. The
new adapter is targeted to OEM systems manufacturers designing PCI local
bus file server and desktop systems, and to systems integrators and VARs
that will integrate PCI local bus add-in cards.

The BT-946C uses the latest revision of BusLogic's MultiMaster ASIC
technology, the new 80C28 Bus Master ASIC chip, and an 80186
microprocessor running at 20MHz to deliver high performance direct memory
access (DMA) operation. The combination of the processor with the new bus
master ASIC offloads the host CPU from SCSI management and reduces command
overhead to increase performance.

The BT-946C meets the PCI Specification Rev. 2.0, providing immediate
compatibility with Intel-486 and Pentium-based PCI systems. Fast SCSI-2
performance is achieved with up to 10MB/sec. synchronous and 7MB/sec.
asynchronous SCSI data transfer rates. For ease of use, the adapter is
fully software programmable and features programmable termination,
controlled by the PCI configuration utility. In addition to its PCI 2.0
standard connector to and from the system, the BT-946C includes an
internal edge connector and external 50-pin SCSI-2 connector. PCI software
utilities are included. 

Advanced Features

The BT-946C has advanced features which optimize performance in high-end,
multitasking, multiuser environments. BusLogic's mailbox protocol provides
efficient internal multitasking operation by supporting up to 255 tasks
with minimum host processor intervention. Command-tag queuing permits
multiple commands to be simultaneously processed for more efficient
transfers. Both initiator and target mode operations are supported to
allow high speed host-to-host communications. Additionally, disk drives of
up to eight gigabytes each are supported and up to three adapters can run
concurrently.

For high performance workstation applications, the BT-946C features BIOS
support for Virtual DMA Services (VDS) that enables users to operate in
Windows enhanced mode without the need for a software driver.
Additionally, up to seven SCSI devices are supported through the BIOS.
This is in contrast to the typical two device support provided through
most SCSI host adapter BIOS.

BusLogic's 80C28 Bus Master ASIC -- MultiMaster Architecture

The 80C28 is BusLogic's third enhancement to its proprietary bus master
ASIC. It provides a high performance, highly integrated architecture,
known as MultiMaster, that provides a common interface to seven PC bus
architectures -- EISA, EISA Enhanced Master Burst (EMB), ISA, Micro
Channel, NuBus, and now VESA and PCI local buses. This common architecture
allows a high level of design leverage across PC platforms. It also
reduces customer support issues by allowing a single device driver per
operating system to be utilized across all supported buses. In addition,
each BusLogic adapter is based on common firmware that has been
field-tested in hundreds of thousands of adapters. This extensive
installed base assures users of a high level of compatibility in each
product.

Host bus transceivers are integrated onto the bus master chip to reduce
component count on the board, resulting in a smaller form factor, lower
cost, and higher reliability products. The bus master interface chip also
provides extra hardware logic that allows SCSI data transfers and host
command fetching to take place concurrently.

Technology of the Future

By virtue of its bus master interface ASIC, BusLogic offers the first
integrated PCI SCSI adapter solution, built from BusLogic's own design.
The BT-946C provides a solution for OEMs wanting the highest performance,
flexibility and compatibility which cannot be achieved through a
motherboard design.

"BusLogic is committed to offering multiple local bus solutions that meet
our customers' needs, and the BT-946C is the next logical step in
delivering on this promise," said Julian Elliott, manager of marketing and
strategic planning. "The emergence of PCI systems represents an
opportunity for BusLogic to offer a high performance SCSI I/O solution
that enables users to benefit from the performance of PCI." 

Compatible With Existing BusLogic Drivers

The BT-946C is software driver compatible with BusLogic's full line of host
adapters. Driver support is available immediately for major operating
systems, including Windows NT, NetWare, DOS, OS/2, SCO UNIX and SunSoft
INTERACTIVE UNIX 4.0. Additionally, because BusLogic's DOS and NetWare
Software Managers feature an Advanced SCSI Programming Interface (ASPI)
layer, the adapter is compatible with a wide range of available
third-party software that enhance flexibility in configuring a SCSI
solution.

Pricing & Availability

OEM evaluation units of the BT-946C will be available in August, with
production beginning in Q4-93. The BT-946C is list priced at $499 (U.S.).
The single unit OEM price is $340.

Founded in 1988, BusLogic, Inc. develops and markets a broad range of
quality and performance-driven hardware and software solutions for
controlling storage and network systems to OEMs and distributors. All
BusLogic products are backed by a responsive and flexible customer support
organization. Headquartered at 4151 Burton Drive, Santa Clara, Calif., the
company is privately held.

BusLogic Inc, 4151 Burton Dr, Santa Clara, CA 95054
408-492-9090;  Fax: 408-492-1542

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