Introduction - Data General Dasher D461 User Manual

This chapter provides an overview of the D411/D461 Display Terminal.
The information in this chapter is organized as follows:
• Product features
• Product description
• System operation overview
Introduction
The DASHER® D411 and D461 Display Terminals (Figure 1-1) are
desk-top, 12-inch, green or amber monochrome terminals containing
many advanced features that combine to improve productivity in a
business or dataprocessing environment. These features include four
separate operating modes, display-screen windows, bidirectional vertical
and horizontal scrolling, built-in editing functions, 81- and 135-column
character viewing, protected character fields, a printer/mouse/digitizer
port, etc.
The D461 terminal is identical to the D411 terminal with one major
addition: the D461 includes a down line loadable (DLL) memory or soft
character set feature that provides for user-defined characters and basic
drawing functions that make the display and printing of graphics
possible. Both the D411 and D461 terminals are intended to be
connected to any host computer system that supports full-duplex
communications via a 20 rnA current loop or EIA RS-232-C compatible
interface and uses Xon/Xoff protocol. An EIA RS-422 interface is
provided as an alternative to current loop for long lines. This interface
does not conform to the associated RS-449 mechanical standard. The
terminal's EIA RS-232-C interface can be used at a remote site in
conjunction with Bell 103, 113, or 212 compatible modems and an
available telephone system.
Throughout this manual, the term D411/D461 terminal is used
whenever the current topic is common to both the D411 and D461
terminals. .
Product Overview 1-1