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Mainframe Green Screen


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Prashant Kumar

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Joined: 15 Feb 2011
Posts: 2
Location: Pune , India

PostPosted: Tue Feb 15, 2011 11:56 pm
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Can anybody please let me know what is a Green Screen environment in mainframes. I heard its an IDE/GUI based application through which mainframes can be accessed. Please correct me if I am wrong.
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8584
Location: Dubuque, Iowa, USA

PostPosted: Wed Feb 16, 2011 12:13 am
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Starting in 1972 the original 3270 terminals were the primary way to access the mainframe. The 3270 terminal was a CRT with black background and green characters -- hence the term "green screen". The terminal displayed whatever was sent from the mainframe, fields could be typed into, some fields would not allow typing into them, and only when an attention key (such as enter, clear, or a function key) was hit would the data on the screen be sent to the mainframe to be processed.

Either you completely misunderstood the term "green screen" or someone has developed a very ironically named IDE/GUI since IDE and GUI are the complete opposite of the original "green screen".
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PeterHolland

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Joined: 27 Oct 2009
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Location: Netherlands, Amstelveen

PostPosted: Wed Feb 16, 2011 12:42 am
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Sometimes im gettging a blue screen on my PC, or blue in the face.
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Ronald Burr

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Joined: 22 Oct 2009
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PostPosted: Wed Feb 16, 2011 12:55 am
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Perhaps this Wiki Article on the 3270 Terminal will help to explain what a "green screen" is - relative to the mainframe.
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dick scherrer

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Joined: 23 Nov 2006
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PostPosted: Wed Feb 16, 2011 2:01 am
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Hello and welcome to the forum,

Quote:
I heard its an IDE/GUI based application through which mainframes can be accessed.
Most 3270 terminal emulators are Windows applications that provide the functionality of a real 3270 allowing users to connect to their mainframe by clicking an icon.

This is a software implementation rather than the original 3270 hardware device originally used.
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Prashant Kumar

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Joined: 15 Feb 2011
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Location: Pune , India

PostPosted: Wed Feb 16, 2011 4:09 am
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Thanks Robert, Ronald and Dick for your replies and clearing my doubt on Green screens.
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