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'''GDDM''' ('''Graphical Data Display Manager''') is a [[computer graphics]] system for the IBM [[System/370]] which was developed in [[IBM]]'s [[Hursley
GDDM was extended in the early 1980s to provide graphics support for all of IBM's display terminals and printers, and ran on all of IBM's mainframe operating systems.
GDDM also provided support for the (then current) international standards for interactive computer graphics: [[Graphical Kernel System|GKS]] and [[PHIGS]]. Both GKS and PHIGS were designed around the requirements of [[CAD]] systems.
GDDM is also available on the IBM i midrange operating system, as well as its predecessor, the AS/400.<ref>{{cite web |title=Creating Presentation Graphics with GDDM |url=https://www.mcpressonline.com/analytics-cognitive/document-management/creating-presentation-graphics-with-gddm |website=MC Press Online |accessdate=Mar 1, 2020}}</ref>
When [[IBM]] and [[Microsoft]] began collaborating on the design of [[OS/2]] in 1986 the Graphics Presentation Interface (GPI) which was the graphics [[API]] in Presentation Manager was based on IBM's GDDM and the Graphics Control Program (GCP). GCP was originally developed in Hursley for the 3270/PC-G and 3270/PC-GX terminals. ▼
GDDM comprises a number of components:
The GPI was used as the primary graphics [[API]] for the [[OS/2]] operating system.▼
* Graphics primitives - lines, circles, boxes etc.
At the time (1980s), the [[graphical user interface]] (GUI) was still in its early stages of popularity, but already it was clear that the foundation of a good GUI was a graphics API with strong ''real-time interactive'' capabilities. Unfortunately, the design of GDDM was closer to (at the time) traditional graphics APIs like [[GKS]], which made it unsuited for more than the simplest interactive uses.▼
* Graphing - through the Presentation Graphics Feature (PGF)
* Language support - [[PL/I]], [[REXX]], [[COBOL]] etc.
* Conversion capabilities - for example to GIF format.
* Interactive Chart Utility (ICU).
GDDM remains in widespread use today, embedded in many [[z/OS]] applications, as well as in system programs.
Microsoft and IBM went their separate ways in 1991. Microsoft continued development of its [[Microsoft Windows|Windows]] operating environment with [[Graphics Device Interface]] (GDI) graphics API. IBM continued with OS/2 for several more years.▼
==GDDM and OS/2 Presentation Manager==
===External links===▼
▲
* [http://www-03.ibm.com/ibm/history/history/year_1979.html] announcement of 3279 and 3287.▼
▲At the time (1980s), the [[graphical user interface]] (GUI) was still in its early stages of popularity, but already it was clear that the foundation of a good GUI was a graphics API with strong ''real-time interactive'' capabilities. Unfortunately, the design of GDDM was closer to (at the time) traditional graphics APIs like [[Graphical Kernel System|GKS]], which made it unsuited for more than the simplest interactive uses.
▲Microsoft and IBM went their separate ways in 1991. Microsoft continued development of its [[Microsoft Windows|Windows]] operating environment with [[Graphics Device Interface]] (GDI) graphics API. IBM continued with OS/2 for several more years.
==
{{Reflist}}
* Charles Petzold, '' Programming the OS/2 Presentation Manager'', Microsoft Press, 1989. {{ISBN
▲* [https://web.archive.org/web/20050117192808/http://www-03.ibm.com/ibm/history/history/year_1979.html
* [https://www-01.ibm.com/support/knowledgecenter/ssw_ibm_i_61/books_web/sc410536.pdf GDDM Programming Guide]
[[Category:Graphics software]]
[[Category:OS/2]]
[[Category:IBM software|Graphical Data Display Manager]]
[[Category:IBM mainframe software]]
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