IBM 3270

(redirected from Green screen application)

IBM 3270

(hardware)
A class of terminals made by IBM known as "Display Devices", normally used to talk to IBM mainframes. The 3270 attempts to minimise the number of I/O interrupts required by accepting large blocks of data, known as datastreams, in which both text and control (or formatting functions) are interspersed allowing an entire screen to be "painted" as a single output operation. The concept of "formatting" in these devices allows the screen to be divided into clusters of contiguous character cells for which numerous attributes (color, highlighting, character set, protection from modification) can be set. Further, using a technique known as 'Read Modified' the changes from any number of formatted fields that have been modified can be read as a single input without transferring any other data, another technique to enhance the terminal throughput of the CPU.

The 3270 had twelve, and later twenty-four, special Programmed Function Keys, or PF keys. When one of these keys was pressed, it would cause the device to generate an I/O interrupt and present a special code identifying which key was pressed. Application program functions such as termination, page-up, page-down or help could be invoked by a single key-push, thereby reducing the load on very busy processors.

A version of the IBM PC called the "3270 PC" was released in October 1983. It included 3270 terminal emulation.

tn3270 is modified version of Telnet which acts as a 3270 terminal emulator and can be used to connect to an IBM computer over a network.

See also broken arrow.
References in periodicals archive ?
We were on a green screen application for our Homebuilder operations and a graphical interface for our financials, accounts payable, report writing, and escrow applications.
BACK IN 1999, MARONDA HOMES RAN A legacy accounting, job costing, and estimating package from MISG Software Solutions that was essentially an old-fashioned IBM AS/400 green screen application.
In fact, this solution can connect BizTalk Server 2000 to any green screen application that is supported by HostAccess Gateway for BizTalk Server 2000.
Pixel USA announced the release of HOSTACCESS Gateway which runs as an NT service and converts on the fly any green screen application into new real-time data objects.
While the data for the call center application will continue to reside on an IBM mainframe, the new desktop technology will permit RCI to replace its green screen application with a new graphical user interface.
Christian Rule, Director of Business Transformation at Flynet added According to research from Vanson Bourne, 93 per cent of today's organisations are still using green screen applications.
Almost overnight, the world evolved from green screen applications tabbing along and entering text to high-resolution graphics, touch-screens, gesture controls, and voice recognition while watching movies.
The high bit rate ensures excellent capture of fast moving objects, while its chroma subsampling feature is perfect for a wide range of video encoding areas such as VFX and green screen applications.
PeepSafe allows any organization that accepts credit cards to de-scope entire functions and network segments, including phone calls, e-mails, faxes, databases, applications, green screen applications, and workstations.
Prices for Apache and Northstar 6XX models - which can run green screen applications at full tilt - were in roughly the same premium range in Europe, too.
The SyVox Emulator speech enables legacy green screen applications running over terminal emulation (TE) connected to mid-range and mainframe platforms including IBM's iSeries (AS400), AIX, and HPUX.
In addition, IBM & Zend business partners are generating revenue by web-enabling green screen applications and building new web-based applications, reducing costs and extending the long life of this powerful platform.