Editing IBM 3270 (section)

=====IBM 3179G=====
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| name         = IBM 3179G
| title        = 
| aka          = IBM 3179G Color Display Station
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| releasedate  = {{Start date|1984|03}}
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| price        = {{USD|2295|1984}}
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| successor    = IBM 3192-G
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The '''IBM 3179G''' announced June 18, 1985,<ref>{{cite web
 |title = IBM 3179 Color Graphics Display Station Models G1 and G2 and IBM 3979 Expansion Unit
 |id = LTR 185-076
 |date = June 18, 1985
 |department= Announcement Letters
 |quote = The IBM 3179 Color Graphics Display Station Models G1 and G2 and the IBM 3979 Expansion Unit are the latest members of the IBM 3270 Information Display System graphics family of products. The 3179 G models are new, attractively priced, eight-color, 1,920- or 2,560-character, 14-inch CRTs with bright, clear colors and a smudge-resistant screen surface. Graphics capabilities are significantly enhanced by the provision of an all-points-addressable (APA) screen and the ability to natively attach the IBM Color Jetprinter (3852 Model 2) for local screen copy.
 |url = https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/6/897/ENUS185-076/index.html&request_locale=en
 |archive-url= https://web.archive.org/web/20210608225107/https://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/6/897/ENUS185-076/index.html&request_locale=en
 |archive-date= 2021-06-08
 |website= IBM
 }}
</ref> is an [[IBM]] mainframe computer terminal providing 80×24 or 80×32 characters, 16 colors, plus graphics<ref>{{cite magazine|url=https://books.google.com/books?id=9z4EAAAAMBAJ&q=IBM+3179G&pg=PA11|title=Sun Software Emulates IBM Display Terminal|author=Mark Stephens|page=11|date=June 20, 1988|magazine=[[InfoWorld]]|volume=10|issue=25|quote=emulates an IBM 3179G display terminal and allows Sun workstation users}}</ref><ref>{{cite magazine|url=https://books.google.com/books?id=ihwEAAAAMBAJ&q=IBM+3179G&pg=PA27|title=Telex beefs up its lineup|author=Jim Brown|page=27|date=February 16, 1987|magazine=[[Network World]]|volume=4|issue=7|quote=...The firm also introduced an option that supports attachment of IBM's 3179G Graphic Display Station to a series 274 controller...}}</ref><ref>{{cite newsgroup|url=https://groups.google.com/d/msg/comp.terminals/GId6mlbDSSc/ouzum7qyojkJ|title=IBM 3179G: To beep or not to beep|author=Ken Hornstein|date=January 10, 1991|newsgroup=comp.terminals}}</ref><ref>{{cite web|url=http://datamuseum.dk/wiki/Genstand:11000554_IBM_3179G|title=Object: 11000554 IBM 3179G, producer: IBM, serial number: 55-N1186, dating: 1985-11-01–1985-11-30, received: 2009-11-18, Description: IBM 3179 — Display station (color or graphics) for IBM 3270|website=Danish Data Historical Society Wiki}}</ref><ref>{{cite magazine|url=https://books.google.com/books?id=tD4MjDGn6ScC&q=IBM+3179G+graphics+display+terminal+released&pg=PA62|title=Software & Services:Productivity Aids|page=62|date=July 15, 1985|magazine=[[Computerworld]]|volume=19|issue=28|quote=Pansopic Systems, Inc has announced that Gener/O1, its online program development system for IBM's CICS, now supports IBM's 3179 Model G graphics terminal...}}</ref> and is the first terminal to support the APA graphics apart from the 3270 PC/G, 3270 PC/GX, PC AT/G and PC AT/GX.

3179-G terminals combine text and graphics as separate layers on the screen. Although the text and graphics appear combined on the screen, the text layer actually sits over the graphics layer. The text layer contains the usual 3270-style cells which display characters (letters, numbers, symbols, or invisible control characters).<ref name=G.models>{{cite web
   |url=http://www.prycroft6.com.au/misc/3270grfx.html
   |title=3270 Graphics|author=Greg Price
   |date=January 2008   |website=Prycroft Six
   |quote=2. Native Vector Graphics — introduced with the 3179G and also used by the 3192G and 3472G.}}</ref> The graphics layer is an area of 720×384 pixels.<ref>{{cite book|chapter-url=http://docs.attachmate.com/reflection/14.x/prog-ref/ibm/3179gcoordinates.htm|archive-url=https://web.archive.org/web/20171210072440/http://docs.attachmate.com/reflection/14.x/prog-ref/ibm/3179gcoordinates.htm|archive-date=2017-12-10|title=Reflection for IBM 14.x — Programming Reference|chapter=3179G graphics coordinates|quote=IBM 3179G graphics coordinates divide the Reflection window into 384 vertical units and 720 horizontal units.}}</ref> ''All Points Addressable'' or ''vector graphics'' is used to paint each pixel in one of sixteen colors. As well as being separate layers on the screen, the text and graphics layers are sent to the display in separate data streams, making them completely independent.

The application i.e. [[Graphical Data Display Manager|GDDM]] sends the vector definitions to the 3179-G, and the work of activating the pixels that represent the picture (the vector-to-raster conversion) is done in the terminal itself. The datastream is related to the number of graphics primitives (lines, arcs, and so on) in the picture. Arcs are split into short vectors, that are sent to the 3179-G to be drawn. The 3179-G does not store graphic data, and so cannot offload any manipulation function from GDDM. In particular, with user control, each new viewing operation means that the data has to be regenerated and retransmitted.

The 3179G is a distributed function terminal (DFT) and requires a downstream load (DSL) to load its microcode from the cluster controller's floppy disk or hard drive.

The G10 model is a standard 122-key typewriter keyboard, while the G20 model offers [[APL programming language|APL]] on the same layout. Compatible with [[System/370|IBM System/370]], [[IBM 4300 series]], 303x, 308x, [[IBM 3090]], and [[IBM 9370]].