I will talk a little bit about that in a separate section Integration with the rest of the world. You may find yourself in the situation where you need to integrate with green-screen applications that have not been so well-designed. The front-end can then be replaced by a modern front-end application. Most well-architected green-screen applications can be turned into service-oriented applications. If you still have them, you should get rid of them. The days where you had green screen applications are long gone.
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Actually, the Unix Terminal and Windows Command Prompt are quite rudimentary, compared to the 3270 interface to z/OS. Similarly, for mainframe techies there is the “green-screen” 3270 terminal. System administrators on Windows use the “DOS” command prompt and Unix techies use the Terminal sessions. And even these are being replaced by tools with more modern interface. Only special system administration tools and application programming tools still have a low level interface. Today therefore, the need for these green screens is limited. (See modern mainframe application architecture section.) They only expose services, or APIs, exposed to mid-tier or front-end applications. Applications on the mainframe most often do not even have a user-interface anymore. Modern mainframe applications do not use these terminal interfaces anymore. We still refer to these 3270 terminals as green screen. These terminals originally worked with green letters on a black background, and could hold as much as 32 lines of 80 characters (or so). Mainframes had technology indicated with a number: the 3270 terminal. Each computer type had its own terminal technology.
This is the period that the green screens originate from. With the terminals, users could enter programs and data online. Later, in the 1960s, computers with terminal interfaces were build. That were the media that were then fed into the computers, using a special reader device. They then entered the programs on punch cards or paper tape. In the early days programmers created their programs on paper, behind their desks.
The green screens on the mainframe are user-interfaces. Green screens are for administrators and programmers, not end-users I will also show you that these green screens have become as uncommon to use as a terminal in Unix or command prompt in Windows. In this section I will talk a little bit about the origins of the green screens in mainframe technology. Where does this green screen imago come from? But still when you think of the mainframe, you think of black screen with green characters, which looks cool in the Matrix, but not so much in real life. In the previous posts I have shown you many modern technologies available on z/OS.
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