Digi SYNC/570, User Manual, Page: 7 / 44

CHAPTER ONE
Introduction
The and the are high-performance expansion
boards for ISA or Micro Channel computers. The SYNC/570 adds two syn-
chronous/asynchronous serial ports while the adds two or four
synchronous/ asynchronous ports. They are designed for applications
requiring cost-effective communications. Each board and connector
package is supplied with all the hardware and software needed for a
complete board installation.
The Hitachi HD64570 Serial Communications Adapter provides a
highly-integrated advanced communications subsystem for the SYNC/570
and the It further maximizes synchronous communications
performance by using protocol-specific features to minimize driver
overhead.
The memory of both the SYNC/570 and the is directly
addressable by both the system and the DMA. Program-initiated DMA
transfers operate at speed independently of other system
activity. This architecture provides low system overhead and high
performance.
The optional OEM software lock ensures that OEM software will operate
only with OEM-supplied boards.
(and SYNC/570 optionally) includes which is
designed to protect the board and the computer in which it is installed
against damage from data line surges.
Multiple SYNC/570 boards may share a common memory window. Micro
Channel boards may also share a common interrupt request line.
The two ports of the each have a high density DB-15 connector
to connect any device with an EIA-232-D interface to your computer. The
board operates at line speeds from 4800 baud to over
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