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Display Attachment Units
The display attachment units are:
•
IBM 5278 Display Attachment Unit, for the 5279 Color Display
•
IBM 5378 Display Attachment Unit Model COl, for the 5379 Display
Model COl
•
IBM 5378 Display Attachment Unit Model MOl, for the 5379 Display
Model MOL
The 5278 and 5378 Display Attachment Units provide the alphanumeric and
graphics functions and the buffer storage necessary for the operation of the
all-points-addressable displays and for the emulation of the IBM PC Color
Graphics Adapter.
However, the way in which both the function and the work to be done is
distributed between the display attachment units and the system units is
different.
In
the 5278, there is hardware to assist in drawing lines and filling areas
when drawing a graphics picture.
In the more powerful 5378, there is a graphics processor which handles the
vector to raster conversion and performs clipping, transformation, and
correlation functions. Provided with this processor is 128 kilobytes of high
speed memory for the display buffers and for storing graphics vectors and
character sets. Part of this memory is also accessed by the 5371 System
Unit.
Both display attachment units, when used with the Graphics Control
Program in the system unit, provide the same graphics function:
•
Vector to raster conversion
•
Picture moving, scaling, and scrolling
•
Two-dimensional transforms
•
Clipping
•
Correlation
•
Lines, polylines, and areas
•
Area fill
•
Arcs and fillets
•
Characters (vector and image).
Chapter 3. The Work Station Components
27
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